Vor Antenna

Operation & Maintenance Manual Manual Part No. 570002-0001

MODEL 1150 DOPPLER VOR (DVOR) ANTENNA 49 Antenna Version Part No. 470165-0001 Part No. 470165-0002

THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION AND SUCH INFORMATION MAY NOT BE DISCLOSED TO OTHERS FOR ANY PURPOSE NOR USED FOR MANUFACTURING PURPOSES WITHOUT WRITTEN PERMISSION FROM AIRPORT SYSTEMS INTERNATIONAL, INC.

Copyright, Airport Systems International, 1991 Revised April, 1993

AIRPORT SYSTEMS INTERNATIONAL, INC. 11300 West 89th Street Overland Park, KS, U.S.A. 66214

THIS SHEET INTENTIONALLY BLANK

MODEL 1150 DVOR ANTENNA

LIST OF EFFECTIVE PAGES

Page No.

Issue

Page No.

Issue

*Title Blank *Effective Pages *Blank *Record of Revisions *Blank *Rev A Highlights *Blank Safety Summary How to Order Warranty Warranty *i ii *iii thru vi 1-1 thru 1-7 *1-8 thru 1-9 1-10 Blank 2-1 *2-2 thru 2-3 2-4 thru 2-12 3-1 3-2 Blank 4-1 4-2 Blank *5-1 5-2

April, 1993 October, 1991 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 October, 1991 October, 1991 October, 1991 October, 1991 April, 1993 October, 1991 April, 1993 October, 1991 April, 1993 October, 1991 October, 1991 April, 1993 October, 1991 October, 1991 October, 1991 October, 1991 October, 1991 April, 1993 October, 1991

6-1 thru 6-2 7-1 7-2 Blank *8-1 thru 8-4 9-1 thru 9-3 *9-4 9-5 thru 9-6 *9-7 9-8 *9-9 thru 9-23 9-24 Blank 10-1 10-2 *11-1 11-2

October, 1991 October, 1991 October, 1991 April, 1993 October, 1991 April, 1993 October, 1991 April, 1993 October, 1991 April, 1991 October, 1993 October, 1991 October, 1991 April, 1991 October, 1991

*An asterisk indicates pages changed, adde d, or deleted by the latest revision.

AIRPORT SYSTEMS INTERNATIONAL, INC. 11300 West 89th Street Overland Park, KS U.S.A. 66214

Rev. A April, 1993



Rev. A April, 1993

MODEL 1150 DVOR ANTENNA Airport Systems International, Inc.

RECORD OF REVISIONS

+)))))))0)))))))))))))))0)))))))))0)))))))0))))))))))))))0)))))))))), * Page * Revision *Insertion*Page * Revision *Insertion * * Number /))))))))0))))))1 Date * Number /)))))))0))))))1 Date * * * Level * Date * * * Level * Date * * G4444444P44444444P444444P444444444P4444444P4444444P444444P4444444444I * All * A *04/93 * 04/93 * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * /)))))))3))))))))3))))))3)))))))))3)))))))3)))))))3))))))3))))))))))1 * * * * * * * * * .)))))))2))))))))2))))))2)))))))))2)))))))2)))))))2))))))2))))))))))Rev. A April, 1993



Rev. A April, 1993

MODEL 1150 DVOR ANTENNA Airport Systems International, Inc. 11300 W. 89th St. Overland Park, KS 66214

DATE: April, 1993 TO:

Holders of the Model 1150 Doppler VOR (DVOR) Antenna Manual (Part. No. 570002-0001). REVISION (A) HIGHLIGHTS

Pages which have been revised, together with the highlights of this revision, are outlined below. Remove the affected pages and replace them with these revised pages. Retain all revision highlights pages. They should be inserted in the manual immediately following the Record of Revisions. Page No.

Description of Change

Effective Pages Record of Revisions REV A HLTS 1-8 1-9 2-2 2-3 8-1 8-2 8-3 thru 8-4 9-4 9-7 thru 9-18 9-19 thru 9-24 11-1 11-3

This page has been added to the manual. This page has been added to the manual. This page has been added to the manual. Table 1-2 has been revised. Paragraph 1.6 and table 1-4 as been added. This page has been revised. Figures 2-1 and 2-2 have been changed. Table 8-1 has been revised. This page has been revised. These pages have been added to the manual. Figure 9-2 has been revised. These pages have been revised. These pages have been added. This page has been revised. This page has been added to the manual.

Rev. A April, 1993

Effectivity April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993 April, 1993



Rev. A April, 1993


The equipment is supplied by Airport Systems Systems International, Inc. For replacement parts and repair service, contact Airport Systems International, Inc.

HOW TO ORDER REPLACEMENT PARTS

When ordering replacement parts, you should direct your order as indicated below and furnish the following information insofar as applicable. To enable us to give better replacement service, please be sure to give us complete information.

INFORMATION INFORMATION REQUIRED

1.

Airpor Airportt Syste Systems ms Inter Internat nation ional, al, Inc. Inc. model model number, number, type type and serial serial number number of equipmen equipment. t.

2.

Unit Unit subsub-as asse semb mbly ly num number ber (wh (wher eree app appllicab icable le)).

3.

Item tem or or ref refer eren ence ce sy symbol mbol num numbe berr fro from m part partss list list or or sche schema mati tic. c.

4.

Airp Airpor ortt Syst System emss Int Inter ernat natio iona nal, l, Inc. Inc. part part num numbe berr and and descr descrip ipti tion on..

5.

Manu Manufa fact ctur urer er's 's code, code, name name and and part part numb number er (whe (where re appl applic icab able le). ).

6.

Quan Quanti tity ty of each each repla eplace cem ment ent par partt req requi uirred. ed.

CORRESPONDENCE/SHIPPING ADDRESS AIRPORT SYSTEMS INTERNATIONAL, INC. 11300 West 89th Street Overland Park, Kansas 66214 U.S.A.

COMMUNICATIONS

Telephone: 913/492-0861 Telex: 49610240 Airport Sys Int. Int. Fax: 913/492-0870

Rev. - October, 1991





AIRPORT SYSTEMS INTERNATIONAL, INC. MANUFACTURER'S WARRANTY

A. The Manufa Manufactu cturer rer warran warrants ts to to the origin original al purc purchas haser, er, subjec subjectt to the limita limitatio tions ns and and exclus exclusion ionss stated below, that all mechanical and electrical e lectrical parts of products which it manufactures (the "Products") will be free of defects in materials and workmanship for a p eriod of (i) one year from the date of installation or (ii) eighteen (18) months from the date of shipment, whichever first occurs (the "Warranty Period"). B. If the Custom Customer er believ believes es a Product Product is defect defective ive,, notic noticee ther thereof eof shall shall be be provi provided ded to the Manufacturer's Customer Service Department at the address provided on the cover page and (if applicable) to the selling Distributor. A defect in materials and workmanship covered by this warranty warranty shall be deemed to have occurred only if, and as of the time when, the Manufacturer is notified in writing by the Customer, within the Warranty Period, that the Product has become defective, and the Manufacturer's personnel verify that the said Product, in fact, does not comply with the warranty provided hereunder and it is determined that: (i) The Products, during the entire entire Warranty Period, have been operated within normal service conditions recommended by the Manufacturer and recognized in the industry, and (ii) The Products have been installed and adjusted according the Manufacturer's Manufacturer's procedures as stated in the Instruction Manual or other instructions supplied in writing by the Manufacturer. C. Failur Failures es caus caused ed by by ligh lightni tning ng or or other other acts acts of God, God, or power power surg surges, es, are not consid considere ered d to be defects in materials and workmanship workmanship and are not covered under this this warranty. Routine maintenance and calibration are also not considered to be defects in materials and workmanship and are not covered under this warranty, Any change, modification or alteration alteration of the Manufacturer's Products not specifically authorized by the Manufacturer will void this warranty. D. If it is is determ determine ined d that that the the condi conditio tions ns for for warr warrant anty y cover coverage age,, as descr describe ibed d above, above, have been been satisfied, the Manufacturer shall repair or replace the defective Products or parts thereof in accordance with the following procedures: (i) Customer will contact the Manufacturer's Manufacturer's Customer Service Department which will issue the Customer a Return Authorization (RA) number. (ii) The component, defective part, or Product, Product, as appropriate, shall be returned returned to the Manufacturer for inspection, freight prepaid by the Customer. The RA number must be clearly clearly displayed on the exterior of the shipping container. No shipments will be accepted without a RA number. All customs duties, fees, etc. will be paid by the Customer. Customer. (iii) If, upon inspection, it it is determined by Manufacturer's personnel that the Product or component thereof is indeed defective and c overed by this warranty, then Manufacturer, at its option, may either repair the Product or defective component



AIRPORT SYSTEMS INTERNATIONAL, INC. MANUFACTURER'S WARRANTY (Cont)

thereof and return the same to the Customer or ship a replacement for the defective Product or part thereof, freight paid. All customs duties, fees, etc. will be paid by the Customer. The Product or component thereof will be returned to the customer utilizing a shipping mode s imilar to that used by Customer to ship the same to the Manufacturer. (iv) If, upon inspection by Manufacturer, it is determined that the Product or component thereof was not defective or was not covered by this warranty, then the cost of all of Manufacturer's inspections and the return shipping charges will b e charged to Customer. E. The Manufacturer reserves the right to make modifications and alterations to Products without obligation to install such improvements on, in, or in place of theretofore manufactured Products of Manufacturer. F. Manufacturer does not warranty any Products, components, subassemblies, or parts not of its own manufacture. Manufacturer hereby transfers to Customer any and all warranties (if any) which it receives from its suppliers. G. This warranty applies only to the original purchaser and, unless Customer receives the express written consent of an officer of Manufacturer, this warranty may not be assigned, transferred, or conveyed to any third party, even if the third party is a bona a fide purchaser of the Products. H. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, WHETHER STATUTORY OR OTHERWISE, INCLUDING AND IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE MANUFACTURER BE LIABLE FOR INDIRECT, INCIDENTAL, COLLATERAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES OF ANY KIND, WHETHER ARISING OUT OF CONTRACT, TORT, NEGLIGENCE, STRICT LIABILITY, OR OTHER PRODUCTS LIABILITY THEORY. I. CUSTOMER'S SOLE REMEDY FOR ANY BREACH OF THE WARRANTY SHALL BE THE REPAIR OR REPLACEMENT OF THE PRODUCTS BY THE MANUFACTURER AS PROVIDED HEREIN, AND IN NO EVENT SHALL THE MANUFACTURER BE REQUIRED TO INCUR COSTS FOR THE REPAIR OR REPLACEMENT OF ANY PRODUCT IN EXCESS OF THE PURCHASE PRICE OF SUCH PRODUCT, PLUS ANY TRANSPORTATION CHARGES ACTUALLY PAID ATTRIBUTABLE TO SUCH PRODUCTS.



TABLE OF CONTENTS

SECTION 1. GENERAL INFORMATION AND REQUIREMENTS

Paragraph 1.1 1.2 1.2.1 1.2.2 1.2.3 1.2.4 1.2.5 1.2.6 1.2.7 1.2.8 1.2.9 1.2.10 1.2.11 1.3 1.4 1.5 1.6

Description

Page

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carrier Antenna Version 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carrier Antenna Version 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sideband Antenna Version 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sideband Antenna Version 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tuning Stub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Positioning Piece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Balun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pedestal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Radome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Counterpoise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Field Monitor Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Specification Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Required But Not Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1 1-1 1-2 1-3 1-4 1-5 1-6 1-6 1-6 1-6 1-6 1-6 1-6 1-8 1-8 1-9 1-9

SECTION 2. TECHNICAL DESCRIPTION 2.1 2.2 2.3

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Simplified Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Detailed Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

SECTION 3. OPERATION 3.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

SECTION 4. STANDARDS AND TOLERANCES 4.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Rev. A April, 1993

i


TABLE OF CONTENTS (Cont)

SECTION 5. PERIODIC MAINTENANCE

Paragraph 5.1 5.2 5.3 5.4

Description

Page

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Performance Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Other Onsite Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Offsite Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1 5-1 5-1 5-2

SECTION 6. MAINTENANCE PROCEDURES 6.1 6.2 6.3 6.3.1 6.3.2 6.3.3 6.4

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Performance Check Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Other Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Site Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inspection of Antenna System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inspection of Field Monitor Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Special Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-1 6-1 6-1 6-1 6-1 6-2 6-2

SECTION 7. CORRECTIVE MAINTENANCE 7.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

SECTION 8. PARTS LIST 8.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

SECTION 9. INSTALLATION, INTEGRATION, AND CHECKOUT 9.1 9.2 9.3 9.4 9.4.1 9.4.2 9.4.3 9.4.4

ii

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unpacking and Repacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sideband Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Theodolite Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tape Measure and Spirit Level Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Carrier Antenna Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-1 9-1 9-1 9-1 9-1 9-2 9-5 9-8



TABLE OF CONTENTS (Cont)

SECTION 9. INSTALLATION, INTEGRATION, AND CHECKOUT

Paragraph 9.4.5 9.4.6 9.4.7 9.4.8 9.4.9 9.4.10

Description

Page

Cutting Antenna Feed Cables to Proper Electrical Length . . . . . . . . . . . . . . . . . . . . . . . 9-9 Tuning the Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12 Adjusting Phase Length of Sideband Antennas to Carrier Antenna . . . . . . . . . . . . . . 9-14 Field Monitor Antenna Foundation Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-16 Field Monitor Antenna (470178-0001) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-14 Field Monitor Antenna (470178-0002) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-20

SECTION 10. SOFTWARE 10.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1

SECTION 11. TROUBLESHOOTING SUPPORT 11.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1

LIST OF TABLES

Table No.

Description

Page

1-1 1-2 1-3 1-4

Equipment Specifications Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Required But Not Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1 2-2

Positioning Piece Part Number and Length for DVOR Frequencies . . . . . . . . . . . . . . . 2-2 Doppler Shift Values from Heterodyning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11

5-1 5-2

Maintenance Intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Other Onsite Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

8-1 8-2 8-3 8-4

Doppler Antenna Kit (48 Antenna) (470165-0001) . . . . . . . . . . . . . . . . . . . . . . . . . . . Stand Alone DVOR Carrier Antenna Kit (470209-0001) . . . . . . . . . . . . . . . . . . . . . . . Carrier Antenna Kit with Walk-in Radome (470208-0001) . . . . . . . . . . . . . . . . . . . . . Civil Installation Kit Rohn Antenna (470252-0001) . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rev. A April, 1993

1-8 1-8 1-9 1-9

8-1 8-2 8-2 8-3 iii


LIST OF TABLES (Cont)

Table No.

Description

Page

8-5 8-6

Doppler Field Monitor Kit (470178-0001) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3 Doppler Field Monitor Kit (470178-0002) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

9-1

Equipment Required for Installation but not Supplied . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

LIST OF ILLUSTRATIONS

Figure No.

Description

Page

1-0 1-1 1-2 1-3 1-4 1-5 1-6

Model 1150 Doppler VOR (DVOR) Antenna Family Tree . . . . . . . . . . . . . . . . . . . . . . . vi Typical DVOR Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Carrier Antenna (Version 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Carrier Antenna (Version 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Sideband Antenna (Version 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Sideband Antenna (Version 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 DVOR Field Monitor Yagi Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

2-1

Approximate Current Distribution for Each Element of the Alford Loop Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Diagram of an Alford Loop Antenna Showing Current Direction in One of the Four Half-Wave Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Generation of Azimuth-Dependent FM by a DVOR Station . . . . . . . . . . . . . . . . . . . . . 2-5 Phase Relationship of DVOR Course Forming Signals . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 Instantaneous Direction of an RF Source with Respect to Aircraft Receivers A, B, C, and D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 Received and Detected AM and FM Signals by Aircraft Receivers A, B, C, and D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 Doppler Shift (Wave Front Measurement) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 Doppler Shift (Heterodyning) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

2-2 2-3 2-4 2-5 2-6 2-7 2-8 9-1 9-2 9-3 9-4 9-5 9-6

iv

Antenna Spacing on Counterpoise Mounting Rail Using Theodolite . . . . . . . . . . . . . . 9-2 Antenna Placement on Counterpoise Mounting Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-4 Antenna Spacing on Counterpoise Mounting Rail Using Sight and Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7 Carrier Antenna Pedestal Installation Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-8 RF Connector Assembly Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-9 Equipment Setup for Cutting RF Cables to Proper Electrical Length . . . . . . . . . . . . . 9-10

Rev. A April, 1993


LIST OF ILLUSTRATIONS (Cont)

Figure No. 9-7 9-8 9-9 9-10 9-11 9-12 9-13 9-14

11-1

Description

Page

Diagram of RF Feed Cable, Tuning Stub, RF Tee Connector, and Positioning Piece Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Setup for Calibrating Vector Voltmeter to 0 . . . . . . . . . . . . . . . . . . . . . . Equipment Setup for Tuning the Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test Equipment Setup for Sideband Antenna to Carrier Antenna Phasing . . . . . . . . . Typical DVOR Field Monitor Antenna Foundation Installation . . . . . . . . . . . . . . . . . Typical DVOR Field Monitor Antenna and Tower . . . . . . . . . . . . . . . . . . . . . . . . . . . DVOR Field Monitor Antenna and Tower (Part No. 470178-0001) Parts Location Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DVOR Field Monitor Antenna and Tower (Part No. 470178-0002) Parts Location Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E

9-11 9-12 9-13 9-15 9-17 9-19 9-21 9-23

Assembly, DVOR Antenna Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3

Rev. A April, 1993

v


Figure 1-0. Model 1150 Doppler VOR (DVOR) Antenna Family Tree.

vi

Rev. A April, 1993


SECTION 1. GENERAL INFORMATION AND REQUIREMENTS

1.1 INTRODUCTION.- This technical instructional book contains data required to install, operate, and maintain the DVOR mechanical Alford loop antenna, supplied by Airport Systems International, Inc., Overland Park, Kansas. Included are a general description and specification data, technical description, operating procedures, standards and tolerances, periodic and corrective maintenance instructions, parts list, installation instructions, and troubleshooting support data. This section contains an equipment description, including purpose of the equipment, acces sories supplied, and equipment required but not supplied.

1.2 EQUIPMENT DESCRIPTION.- Figure 1-1 shows a typical DVOR site. The DVOR antenna system consists of a single carrier antenna assembly at the center of the counterpoise, and 48 sideband antenna assemblies spaced equally in a 44 foot diameter circle concentric with the carrier antenna assembly. The mechanical Alford loop antenna is con structed of two fixed-length dipole antennas, folded and arranged so that the element midsections form a square approximately 1/4 wavelength on each side. The carrier and sideband antennas consist of a single Alford loop, mounted on a support plate. The support plate is mounted 48 inches (approximately one-half wavelength) above the counterpoise by metal pedestal. This is to insure the proper coverage of the signal in-space. The pedestal provides a conduit for RF feed lines, 180 degree balun, and the antenna tuning stub. Each antenna element is enclosed in a weatherproof, cone-shaped fiberglass radome.

Figure 1-1. Typical DVOR Site.


1-1


The antennas are mounted on a counterpoise. The counterpoise is a circular, metallic support structure that is made of aluminum or galvanized steel and is assembled in segments that are bolted together. The counterpoise is between 60 and 120 feet in diameter and is elevated between 8 to 20 feet above ground level.

1.2.1 Carrier Antenna (Version 1).- Refer to figure 1-2. The carrier antenna version 1, is a single Alford loop on a support plate. The antenna is supported above the counterpoise by a metal pedestal. This antenna is electrically tuned to the station frequency by means of two large, air-dielectric, metal disc capacitors.

Figure 1-2. Carrier Antenna (Version 1).

1-2



1.2.2 Carrier Antenna (Version 2).- Refer to figure 1-3. This antenna is electrically identical to carrier antenna Version 1. The Version 2 antenna has been upgraded. The two large, air-dielectric, metal disc capacitors used in the Version 1 antenna have been replaced by a single, high voltage, glass capacitor. This greatly improves tuning and makes the antenna less susceptible to vibration and corrosion because of the reduction in the number of mechanical parts. Mounting is identical to version 1.

Figure 1-3. Carrier Antenna (Version 2).


1-3


1.2.3 Sideband Antenna (V1).- Refer to figure 1-4. Each sideband antenna is an Alford loop, similar to carrier antenna (V1) but, without the large hole in the center of the support plate. This antenna is electrically tuned to the station frequency by means of two large, air-dielectric, metal disc capacitors. The antennas are mounted independently on individual support plates, supported above the counterpoise by metal pedestals equal in height to the carrier antenna.

Figure 1-4. Sideband Antenna (Version 1). 1-4



1.2.4 Sideband Antenna (V2).- Refer to figure 1-5. Each sideband antenna is electrically identical to sideband antenna Version 1. The Version 2 antenna has been upgraded. The two large, air-dielectric, metal disc capacitors used in the Version 1 antenna have been replaced by a single, high voltage, glass capacitor. This greatly improves tuning and makes the antenna less susceptible to vibration and corrosion because of the reduction in the number of mechanical parts. Mounting is identical to version 1.

Figure 1-5. Sideband Antenna (Version 2). Rev. - October, 1991

1-5

MODEL 1150 DVOR ANTENNA E

1.2.5 Tuning Stub.- The tuning stub is a 90 line section made out of RG-214 cable with a connector on one end and open at the other end. The basic function of the stub is to supply the needed capacitive reactance to make the point of the stub attachment pure resistive.

1.2.6 Positioning Piece.- The positioning piece is a length of RG-214 cable with a connector at each end. The purpose of the positioning piece is to place the tuning stub at a point on the input line where the resistive component of the complex impedance is equal to the characteristic impedance of the line (50 ohms). The length of the positioning piece is factory selected for the frequency band of operation. Refer to table 2-1 for part number and length.

E

1.2.7 Balun.- The balun is a 180 line section that hangs directly under the center of the antenna inside the pedestal and is used to develop a balanced signal output from a coaxial line input.

1.2.8 Pedestal.- The antenna pedestal is a 6061-T6 aluminum tube with mounting plates on each end. The pedestal supports the Alford loop antenna and provides a conduit for feed cables, the 180 balun, positioning piece, and the tuning stub. E

1.2.9 Radome.- The radome is a cone-shaped, fiberglass enclosure that protects the radiating elements of the antenna from the weather and vermin infestation.

1.2.10 Counterpoise.- The counterpoise is a circular, metallic support structure that is made of aluminum or galvanized steel and is assembled in segments that are bolted together. It is typically between 60 and 120 feet in diameter and is elevated 8 to 20 feet above ground level. 1.2.11 Field Monitor Antenna.- Refer to figure 1. There is one field monitor antenna in each DVOR system. The field monitor antenna is a single Yagi antenna that is installed on a support tower 300 to 600 feet from the carrier antenna. It may be installed on any radial. Typically, the field monitor antenna is not located on an important radial (such as an approach radial).

1-6



Figure 1-6. DVOR Field Monitor Yagi Antenna.

Rev. A April, 1993

1-7


1.3 EQUIPMENT SPECIFICATION DATA.- The equipment specification data is listed in table 1-1. Table 1-1. Equipment Specification Data.

Equipment Manufacturer:

Airport Systems International, Inc.

Equipment Model and Type:

Model 1150 DVOR Antenna

Frequency range:

108-118 MHz

Polarization:

Horizontal

Characteristic impedance of feed cables:

50 ohm

Environmental: Temperature range: Relative Humidity:

-50 C to +70 C 0 to 95% non-condensing

Cone of Silence:

37.5 to 42.5 degrees from vertical

E

E

1.4 EQUIPMENT SUPPLIED.- Table 1-2 is a list of all major equipment supplied.

Table 1-2. Equipment Supplied.

Quantity

1-8

Description

Part Number

1

Doppler Antenna Kit (48 Antenna)

470165-0001

1

Civil Installation Kit Rohn Antenna

470252-0001

Rev. A April, 1993


1.5 EQUIPMENT REQUIRED BUT NOT SUPPLIED.- Table 1-3 is a list of all equipment that is not supplied, but is required to make the antenna operational, or to install the antenna.

Table 1-3. Equipment Required But Not Supplied

Quantity

1 1 1 1 2

Description

Vector Voltmeter, Hewlett Packard Signal Generator, BNC adapters, Hewlett Packard Multimeter, Fluke 50 Ohm Terminations, Type N

Manufacturer Part No.

Model 8405A HP10218A Model 83 Bird

1.6 OPTIONAL EQUIPMENT.- Table 1-4 contains a list of the optional equipment for the DVOR Antenna system. Table 1-4. Optional Equipment.

Quantity

1 1 1 1

Rev. A April, 1993

Description

Stand Alone DVOR Carrier Antenna Kit Carrier Antenna Kit with Walk-in Radome Doppler Field Monitor Kit Doppler Field Monitor Kit

Part Number

470209-0001 470208-0001 470178-0001 470178-0002

1-9



1-10

Rev. A April, 1993


SECTION 2. TECHNICAL DESCRIPTION

2.1 INTRODUCTION.- This section contains a simplified theory of operation of the Alford loop antenna and a detailed theory of operation of the DVOR antenna s ystem.

2.2 SIMPLIFIED THEORY OF OPERATION.- The Alford loop antenna emits a horizontally polarized wave. The horizontal radiation pattern, in free space, from a single horizontally polarized Alford loop is omni-directional and the vertical pattern is bi-directional. Each dipole has a wide radiating surface making the Alford loop antenna more efficient than other loop type antennas with smaller radiating surfaces. A signal with opposite phases is applied to the center of the dipoles via a crossover connection (balun). This causes the currents in the folded-back portions of the elements to contribute very little to the radiated field, since the currents are in opposite directions and tend to cancel each other. This also causes the current flow in the radiating faces of the loop to be in the same direction, either clockwise or counter-clockwise depending on the point in the RF cycle. Each radiating face, being the midsection of a 1/2 wavelength element (approximately), has a current amplitude that varies from a maximum at the center of the radiating surface to approximately 70 percent of maximum at the ends of the radiating surface, refer to figure 2-1. The slight non-uniformity of current amplitude does not destroy the circularity of the pattern because, at points oriented near the corners of the loop, such as point P in figure 2-2, some radiation is also received from an adjacent face. Consequently, the loop behaves as if the current were nearly constant in all portions of the radiating faces and the radiating pattern is approximately the same as that of a small circular loop. The Alford loop is generally mounted so that the loop is contained in a plane parallel to the ground, it has a non-directional horizontal radiation pattern and a figure-of-eight vertical radiation pattern. The two dipoles attached with a crossover require a balanced feed. This is accomplished by attaching a half wave-length balun between the two feed points. The purpose of the half-wave-length balun is to develop the equivalent of a balanced signal source output from a coaxial line input, which is inherently unbalanced. With a balun in place, either feed point can be fed with an unbalanced line. In theory, the unbalanced feed point impedance is 300 ohms resistive at the resonant frequency and the impedance departs from 300 ohms as frequency varies across the VOR band. This variation is sufficient to cause a substantial mismatch to the transmitter at this point when not tuned correctly. For this reason, an impedance matching network is required. Inside the Alford loop antenna is a glass or an air-dielectric metal disc tuning capa citor (depending on the antenna). The tuning capacitor is located in the center of the dipoles near the feed point. The tuning capacitor does not change the resonant frequency of the antenna, but does effect the impedance match of the antenna.

Rev. A April, 1993

2-1


The input impedance of the Alford loop antenna was measured over the 108 MHz to 118 MHz VOR band while varying the tuning capacitors from maximum to minimum capacitance. The results, plotted on a Smith Chart, showed the tuning capacitor to have the same effect on impedance as frequency variation. In addition, the impedance plot was a circle centered on an impedance of 50 ohms resistance in parallel with 30 ohm inductance. To match the antenna, the antenna input impedance must be 50 ohms at the operating frequency. The simplest means to match the antenna is to select a point on the input coax where the impedance equals 50 ohms resistive in parallel with some value of reactance. At that point, a reactive stub (tuning stub) is inserted between the RF cable and the antenna connector. This is accomplished by using a positioning piece and type N Tee connector. The tuning stub is then trimmed to tune out the reactance, yielding a matched 50 ohm impedance to the transmitter. The tuning stub length has a profound effect on the VSWR. It is cut for minimum VSWR at one frequency. The tuning capacitors are then used to impedance match the antenna for a better than 1.10:1 VSWR. The proper match cannot be obtained over the full 10 MHz operating bandwidth with one positioning piece length between the antenna input and the type N Tee. Therefore, the positioning piece is factory selected for the band of operation (see table 2-1).

Table 2-1. Positioning Piece Part Number and Length for DVOR Frequencies

2-2

Frequency

Part Number

108 - 110 MHz 111 - 114 MHz 115 - 118 MHz

070350-0001 070350-0002 070350-0003

Length 16.75 inches 12.0 inches 8.75 inches

Rev. A April, 1993


Figure 2-1. Approximate Current Distribution for Each Element of the Alford Loop Radiator.

Figure 2-2. Diagram of an Alford Loop Antenna Showing Current Directions in One of the Four Half-Wave Elements. Rev. A April, 1993

2-3


2.3 DETAILED THEORY OF OPERATION .- The DVOR antenna system simulates a rotating arm with a transmitting antenna at each end, radiating the upper sideband signal from one end and the lower sideband signal from the other end. This is achieved electronically by using 48 antennas spaced equally around the perimeter of a circle 44 feet (13.4 meters) in diameter, with an antenna in the center of the circle radiating a reference carrier. Consider the effect of simulated antenna rotation on an airborne receiver. When the upper sideband source is moving toward the aircraft, the doppler effect causes the airborne receiver input frequency to become higher than f c+9960 Hz, and for the lower sideband source, which is moving away, the frequency becomes less than f c+9960 Hz, f c being the carrier frequency. The frequency difference changes sinusoidally due to the simulated rotation. The difference is maximum when the line joining the two radiating antennas is perpendicular to the radial to the aircraft. The difference is equal to zero when the two sideband sources align with the radial to the aircraft since, at that moment, the distance between each sideband source and the receiver does not vary. The moment of zero frequency deviation is different for different positions of the aircraft around the station. Therefore, the recovered 30 Hz FM signal will have a different phase for each of these different positions. For the receiver North of the DVOR station, the 30 Hz FM signal must be in phase with the 30 Hz AM signal; both signals passing through their positive zero crossings at the same time. To achieve this, the following has to be observed: At the moment that the 30 Hz amplitude modulation of the carrier is passing through its positive zero crossing, the simulated rotating antennas shall align with antenna number 1 (at North) and antenna number 25 (at South), with the North antenna radiating the lower sideband and the South antenna radiating the upper sideband. The lower sideband frequency will be decreasing; the upper increasing. The subcarrier frequency will be increasing from exactly 9960 Hz up and the 30 Hz FM signal will be passing through its positive zero crossing. The relationship between the Doppler induced frequency modulated 30 Hz variable signal and the 30 Hz amplitude modulated carrier for receivers spaced around the DVOR station is bes t illustrated by figures 2-3 through 2-7. Generation of the azimuth-dependent FM by a DVOR station is depicted in figure 2-3. It is assumed that the distance from the antenna array, shown as points A (sideband antenna) and M (reference antenna), to the aircraft receivers, shown as R1 and R2, is very much larger than the diameter of the array (distance D) and that, at the beginning of antenna array commutation, the antenna at the no rthern most point of the array is radiating an upper sideband signal. Since the lower sideband signal is similar to that of the upper sideband signal, only the upper sideband signal will be discussed. Antenna (signal) A traverses around antenna M in a counterclockwise direction. Four specific locations for antenna A are marked (positions 1, 2, 3, and 4). The rotation of antenna A with respect to antenna M causes receiver R1 to detect a variable signal that leads the reference signal by 270 . Receiver R2, however, is detecting a variable signal that leads the reference signal by 180 . Figure 2-4 is a vector representation of the FM and AM phase relationship at eight points about a DVOR station. E

E

2-4



Figure 2-3. Generation of Azimuth-Dependent FM by a DVOR Station.


2-5


Figure 2-4. Phase Relationship of DVOR Course Forming Signals.

2-6



Figure 2-5 depicts aircraft receivers A, B, C, and D at the four cardinal points of a DVOR station. Shown, too, is the instantaneous direction of a rotating RF source at those points. Figure 2-6 is an illustration of the signals recovered by aircraft receivers A, B, C, and D. At the beginning of array commutation, aircraft receiver A perceives a radiating source moving to the west. Because at this instant (t = 0) the distance between receiver A and the radiating source is neither increasing nor decreasing, aircraft receiver A will recover an FM subcarrier which has no frequency deviation. The FM subcarrier has a frequency of 9960 Hz at this instant. A quarter of an antenna array commutation cycle later (t = 1/120 sec), the radiating point source is at the western most point of the array and is moving away from aircraft receiver A to the south at its greatest speed. From the Doppler effect, the FM subcarrier is frequency deviated downward by its maximum extent of 480 Hz. The FM subcarrier has a frequency of 9480 Hz at this instant (t = 1/120 sec). When the antenna array commutation has gone through one half of its cycle (t = 1/60), aircraft receiver A perceives a radiating point source at the southern most point of the array and moving directly east. At this time, the distance between the radiating source and the aircraft receiver is neither increasing nor decreasing; therefore, there is no Doppler induced frequency deviation of the FM subcarrier. The variable FM subcarrier has a frequency of 9960 Hz at this instant. When the antenna array is commutated through three-fourths of its cycle (t = 3/120 sec), aircraft receiver A now perceives a radiating point source at the eastern most point of the array and moving toward it at its maximum speed. The Doppler effect frequency deviates the variable FM subcarrier upwards by its maximum extent of 480 Hz. The variable FM subcarrier has a frequency deviation of 10,440 Hz at this time. A further one quarter cycle of antenna array commutation brings the point source back to its northern most point and the process repeats. The variable FM subcarrier is detected in aircraft receiver A and is output as the detected 30 Hz FM variable signal. Aircraft receiver A also detects the 30 Hz amplitude modulated carrier and outputs a detected 30 Hz reference signal. The received reference AM signal and the detected 30 Hz AM reference are identical for receivers A, B, C, and D. An analysis similar to that for receiver A, but from the viewpoint of receivers B, C, and D yield the remaining variable FM subcarrier and detected 30 Hz FM variable waveforms shown in figure 2-6. Aircraft receiver D has a bearing of 90 and from figure 2-6 it can be seen that the detected 30 Hz FM variable signal leads the reference by one-quarter cycle, or 90 . Similarly for aircraft receiver C, the variable signal leads the reference by one-half cycle, or 180 , and the bearing of receiver C is 180 . Receiver B has a bearing of 270 and the variable signal leads the reference by three-fourths cycle or 270 . Aircraft Receiver A has a bearing of 0 and its two signals are in phase. E

E

E

E

E

E

E

The method of inducing the Doppler shift in the sideband is demonstrated by figure 2-7. Again, for the purpose of this discussion, radiation from only one sideband element is assumed. For an observer located North of the DVOR station, the Doppler shift is most pronounced when the West and East antennas are radiating. No Doppler shift is present when the North and South antennas are radiating. With a counterclockwise rotation of the antenna, antenna #12 would emit RF energy and 1/1440 of a second later, antenna #13 would emit RF energy. Figure 2-7 shows the distance that each wave front has traveled in some unit length of time. The separation of the two wavefronts is equal to distance d1. A few moments later, antenna #36 is turned on causing it to emit RF energy. At 1/1440 of a second later, antenna #37 is conducting and radiating RF energy.


2-7


After the same time period as before with antennas #12 and #13, the separation of the two wavefronts is measured and found to be distance d2. It is readily seen that d1 » d2. The distance of separation can be equated to time as the signals propagate through space; i.e., the time required for Emax of each successive wave front to pass the observer. The reciprocal of time is frequency (1/t = f).

Figure 2-5. Instantaneous Direction of an RF Source with Respect to Aircraft Receivers A, B, C and D.

2-8



Figure 2-6. Received and Detected AM and FM Signals by Aircraft Receivers A, B, C, and D. Due to the counterclockwise rotation of the sideband radiating elements, the western antenna would produce a Doppler shifted frequency that was less than the fundamental frequency (9960 Hz - 480 Hz). The eastern antenna would produce a frequency greater than the fundamental frequency (9960 Hz + 480 Hz). The northern and southern antennas would produce no shift.


2-9


Figure 2-7. Doppler Shift (Wave front Measurement). Refer to table 2-2 and figure 2-8. It might be wrongly assumed that because the upp er and lower sidebands are radiating from oppositely paired antenna (e.g., upper sideband on #12 and lower sideband on #36) that the two sidebands are producing opposite Doppler shifts. It is true that the fundamental sideband frequency is shifted downward (f USB-480 Hz) when movement is west of the station and shifted upward (f LSB+480 Hz) when rotation is east of the station. However, after heterodyning, it can be seen that both the upper and lower sidebands are shifting in the same direction; i.e., from 9960 Hz to 9480 Hz, for the example given. (Heterodyning is the process of mixing two frequencies together in order to produce two other frequencies equal to the sum and difference of the first two.) 2-10



Table 2-2. Doppler Shift Values from Heterodyning

Upper Sideband (USB) f USB

f c

East:

108010440

-

108000000

=

10440

Hz

No/So:

108009960

-

108000000

=

9960

Hz

West:

108009480

-

108000000

=

9480

Hz

West of the station the upper sideband frequency shifts from 108.009960 MHz to 108.009480 MHz or, after h eterodyning, from 9960 Hz to 9480 Hz.

Lower Sideband (LSB) f LSB

f c

East:

107990520

-

108000000

=

9480

Hz

No/So:

107990040

-

108000000

=

9960

Hz

West:

107989560

-

108000000

=

10440

Hz

East of the station the lower sideband frequency shifts from 107.990040 MHz to 107.990520 MHz or, after h eterodyning, from 9960 Hz to 9480 Hz.


2-11


Figure 2-8. Doppler Shift (Heterodyning).

2-12



SECTION 3. OPERATION

3.1 INTRODUCTION.- After initial installation and adjustment of the DVOR antenna, no operating procedures are required. Refer to DVOR system manual (571150-0002) for system operating procedures.


3-1



3-2



SECTION 4. STANDARDS AND TOLERANCES

4.1 INTRODUCTION.- Not applicable to this manual.


4-1



4-2



SECTION 5. PERIODIC MAINTENANCE

5.1 INTRODUCTION.- This section contains performance checks and other preventive maintenance that must be performed periodically. Refer to table 5-1 for a list of activities to be preformed on a recurring basis.

Table 5-1. Maintenance Intervals.

Step

Description

1.

Site Inspection

2.

Inspection of Antenna System

3.

Quarterly T

Inspection of Field Monitor

T

SemiAnnual

Annual

T

T

5.3.1

T

5.3.2

T

5.3.3

T

Reference Paragraph

5.2 PERFORMANCE CHECKS.- There are no assemblies that require performance checks.

5.3 OTHER ONSITE MAINTENANCE.- Table 5-2 contains a list of other onsite maintenance procedures that are necessary to ensure the DVOR antenna s ystem is functioning properly. Table 5-2. Other Onsite Maintenance.

Reference Paragraph or Table Standards and Tolerances

Maintenance Procedures

Site Inspection - Verify site inspection has been preformed.

N/A

6.3.1

Antenna System Inspection Verify antenna inspection has been preformed.

N/A

6.3.2

Visual Inspections

1.

2.

Rev. A April, 1993

5-1

MODEL

1150

DVOR

ANTENNA

Table 5-2. Other Onsite Maintenance (Cont).

Reference Paragraph or Table

Visual Inspections

3.

Field Monitor Inspection Verify field monitor inspection has been preformed

Standards and Tolerances

N/A

Maintenance Procedures

6.3.3

5.4 OFFSITE MAINTENANCE.- There are no assemblies that require depot (offsite) periodic overhaul or calibration.

5-2

Rev. A April, 1993


SECTION 6. MAINTENANCE PROCEDURES

6.1 INTRODUCTION.- This section contains replacement and tuneup procedures for sideband and carrier antennas and RF cables.

6.2 PERFORMANCE CHECK PROCEDURES.- There are no assemblies that require performance checks.

6.3 OTHER MAINTENANCE PROCEDURES.-

6.3.1 Site Inspection.- Site inspections may be preformed with the transmitter on, although walking on the counterpoise to remove obstructions may cause an alarm condition. Inspections to the antenna system (6.3.2) should be done with the DVOR transmitter off. Consult proper airport authority before taking the DVOR station off the air. a

Check that the site is clear of any new obstructions or materials which could affect the normal operation of the DVOR system.

b.

Check the shelter, inside and out, for any sign of water filtration, damage, or other deterioration.

c.

Check the condition of the air conditioner, shelter lighting, obstruction lights, baseboard heaters, electrical outlets, etc.

d.

Check for and remove any accumulation of snow, ice, or debris on the field monitor antenna.

e.

Check for and remove any accumulation of snow, ice or debris on the counterpoise surface.

6.3.2 Inspection of the Antenna System.a.

Assure that both DVOR transmitters are turned off.

b.

With radomes removed, inspect the mating areas of the radomes where they connect with the antenna pedestal. Check for any signs of water leakage or deterioration. Repair or replace as necessary.

c.

Inspect the antenna elements for any signs of water damage or corrosion. Repair or replace as necessary.

d.

Remove access cover located on antenna support pedestal. Without removing cables, check the input cables and connectors for breaks, cracks, or corrosion. Check that the connectors are securely fastened. Check cables for vermin damage, loose or broken tie wraps, etc. Replace as necessary.


6-1


e.

Inspect the remaining parts of the antenna for signs of vermin infestation, corrosion, water damage, etc. Repair as necessary.

f.

Inspect the counterpoise for any signs of deterioration, paying special attention to welded joints, bolted connections, mesh, etc. Check for proper electrical connection between the counterpoise segments and grounding connections. Repair as necessary.

g.

Replace access covers and antenna radomes.

h.

Remove any articles carried onto the counterpoise.

6.3.3 Inspection of Field Monitor Antenna.a.

Inspect the condition of the field monitor antenna. Make sure it is solidly mounted and that all nuts and bolts are tightened.

b.

Inspect the condition of the field monitor antenna coaxial cables and tie wraps, for signs of cracks or breakage. Replace if necessary.

6.4 SPECIAL MAINTENANCE PROCEDURES.maintenance procedures.

6-2

There are no assemblies that require special



SECTION 7. CORRECTIVE MAINTENANCE



7-1



7-2



SECTION 8. PARTS LIST

8.1 INTRODUCTION.- This section contains the parts lists used in DVOR Antenna system. Table 8-1 lists the parts supplied in the Doppler Antenna kit; table 8-2 contains a list of the parts supplied in the Stand Alone DVOR Carrier Antenna Kit; table 8-3 contains a list of the parts supplied in the Carrier Antenna with Walk-in Radome Kit; table 8-4 contains a list of the parts supplied in the Civil Installation Kit, Rohn Antenna; table 8-5 contains a list of parts supplied in the Doppler Field Monitor kit (470180-0001); table 8-6 contains a list of parts supplied in the Doppler Field Monitor kit (470180-0002).

Table 8-1. Doppler Antenna Kit (48 Antenna)(470165-0001) Refer to figure 11-1. Qty

Part Number

Description

48 48 48 48 48 200 210 200 350 700 350 350 200 215 300 98 2400 ft. 48 48 48 1 1 1 100 48 200 200

080001-0001 950394-0001 070350-9999 950392-0001 701784-0001 321070-0000 136000-0079 302044-0000 327079-0000 137000-0814 136504-0141 321014-0000 302097-0000 136504-0139 137002-0014 180303-0001 443060-0001 135230-0000 070351-0001 070352-0001 900065-0000 900115-0001 900115-0002 302102-0595 185209-0000 327601-0000 136504-0138

Doppler Sideband Antenna Assy. Sideband Antenna Radome Assy. Positioning Piece (Specify Freq.) Sideband Antenna Pedestal Sideband Antenna Pedestal Access Cover 1" Beam Clamp 1/4-20 x 1/2" Machine Screw 2" Retaining Strap 3/8-16 x 1-3/4" Machine Bolt .406 x .812 x .065 Flat Washer 3/8" Lock Washer 3/8-16 Hex Nut Screw Mount Cable Tie 1/4" Lock Washer .395 x .750 Slotted Washer Type-N Connector 1/4", 50 ohm, RF Cable Type-N Adapter Tuning Stub Sideband Antenna Balun Sealing Compound 10.5 oz. Gold Tube Type Marker Black Tube Type Marker Tiedown Strap UG-27C, Plug Jack Connector Adapter 10-32 x 1/2" Machine Screw No. 10 Lock Washer

Rev. A April, 1993

Item No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

8-1


Table 8-2. Stand Alone DVOR Carrier Antenna Kit. (470209-0001) Qty

Part Number

Description

1 1 1 1 1 1 1 1 8 8 8 8 4 50 ft. 2 6 6

080001-0001 950394-0001 250392-0001 070352-0001 070351-0001 185230-0000 185209-0000 070350-9999 137000-0814 327079-0000 136504-0141 321014-0000 137002-0014 443060-0001 180303-0001 327601-0000 136504-0138

Doppler Sideband Antenna Assy. Sideband Antenna Radome Assy. Antenna Pedestal Sideband Antenna Balun Tuning Stub Type-N Adapter UG-27C, Plug Jack Connector Adapter Positioning Piece (Specify Freq.) .406 x .812 x .065 Flat Washer 3/8-16 x 1-3/4" Machine Bolt 3/8" Lock Washer 3/8-16 Hex Nut .395" x .750" Slotted Washer 1/4", 50 ohm, RF Cable Type-N Connector 10-32 x 1/2" Machine Screw No. 10 Lock Washer

Table 8-3. Carrier Antenna Kit with Walk-in Radome (470208-0001)

8-2

Qty

Part Number

Description

1 5 5 7 2 4 1 1 1 1 8 8 8 8 4

080002-0001 327025-0008 137000-0810 137501-0011 327024-0021 327025-0012 070352-0001 070351-0001 185230-0000 185209-0000 137000-0814 327079-0000 136504-0141 321014-0000 137002-0014

Doppler Carrier Antenna Assy 1/4-20 x 2" Machine Bolt .281 x .625 x .065 Flat Washer 1/4-20 Hex Nut 3/8-16 x 5" Machine Bolt 1/4-20 x 3" SST. Machine Bolt Sideband Antenna Balun Tuning Stub Type-N Adapter UG-27C, Plug Jack Connector Adapter .406 x .812 x .065 Flat Washer 3/8-16 x 1-3/4" Machine Bolt 3/8" Lock Washer 3/8-16 Hex Nut .395" x .750" Slotted Washer

Rev. A April, 1993


Table 8-3. Carrier Antenna Kit with Walk-in Radome (Cont) (470208-0001) Qty

Part Number

Description

50 ft. 2 1 4 2 2 1

443060-0001 180303-0001 801774-0001 801738-0001 801737-0001 701798-0001 070350-9999

1/4", 50 ohm, RF Cable Type-N Connector Doppler Antenna Pedestal Cable Duct Carrier Antenna Mounting Spacer Rod Carrier Antenna Spacer Block Clamp Carrier Antenna Special Half Clamp Positioning Piece (Specify Freq.)

Table 8-4. Civil Installation Kit Rohn Antenna (470252-0001) (Refer to figure 9-11) Qty

Part Number

Description

1 1 15 ft. 1

950181-0000 900076-0000 146006-0000 900130-350

3-1/2' Rohn SB25G Tower 3/4" x 10' Copper Clad Steel Ground Rod No. 6 AWG Copper Wire Conduit, MN, Rigid, 1" x 5' PVC

Item No. 1 2 3 4

Table 8-5. Doppler Field Monitor Kit (470178-0001) (Refer to figure 9-13) Qty

Part Number

Description

15 ft. 1 1 1 2 2 10 4 2 1 1 10 8 4

146006-0000 347015-0000 400049-0000 900076-0000 950180-0000 302090-0000 900082-0000 347003-0000 900084-0006 950304-0000 180316-0000 302043-0000 137000-0814 136504-0141

No. 6 AWG Copper Wire Ground Rod Splice conductor Terminal Lug 3/4" x 10' Copper Clad Steel Ground Rod Rohn 25G 10 Foot Tower 2" Flat Back Saddle Clamp Rigid Metal Conduit 1-1/8" O.D Retaining Strap 1-5/8" x 1.5' Structural Channel Yagi Horizontal Polarized Antenna Assy 1.20" x 0.44" TNC Connector Black Tiedown Strap .406 x .812 x .065 Flat Washer 3/8" Lock Washer

Rev. A April, 1993

Item No. --MP1 MP2 MP3 MP5 MP7 MP9 MP10 MP16

8-3


Table 8-5. Doppler Field Monitor Kit (Cont). (470178-0001) Qty

Part Number

Description

4 4 1 350 ft.

321014-0000 327060-0000 180303-0001 434060-0001

3/8-16 Hex Nut 3/8-16 x 1-1/4" SST. Hex Head Cap Screw Type-N Connector 1/4", 50 ohms, RF Cable

Item No.

Table 8-6. Doppler Field Monitor Kit (470178-0002) (Refer to figure 9-14) Qty

Part Number

Description

400 ft. 2 1 1 30 1 1 1

443060-0001 950180-0000 400049-0000 180316-0000 302043-0000 950304-0000 180303-0001 950180-0003

1/4", 50 ohm, RF Cable Rohn 25G 10 Foot Tower Terminal Lug 1.20" x 0.44" TNC Connector Black Tiedown Strap Yagi Horizontal Polarized Antenna Assy Type-N Connector Rohn 25AG2 10' with 2-1/4" O.D. Pipe

8-4

Item No. 1 2 3 4 5 6 7 8

Rev. A April, 1993


SECTION 9. INSTALLATION, INTEGRATIONS, AND CHECKOUT

9.1 INTRODUCTION.- This section contains the information required to install the antenna equipment, inspect the installation, perform startup and preliminary testing procedures, and perform an installation verification test.

9.2 UNPACKING AND REPACKING.- Packing cases are to be handled and opened with care to avoid damage to electronics components. Be certain all fasteners, supports, and tie-downs have been removed before attempting to remove the units. Inspect all items for shipping damage and check against the packing slip to insure complete shipment. Check the packing slip against table 1-2.

9.3 TEST EQUIPMENT REQUIRED.- Refer to table 1-3 for a list of test equipment that is required for installation.

Table 9-1. Equipment Required for Installation but not Supplied. Quantity 1 1 4 1 4

Description Theodolite Electric Drill Vise Grip Type Clamps 3/8 inch Transfer Punch 3/8 inch Drill Bits

9.4 INSTALLATION.-

9.4.1 Sideband Antenna Installation.- The sideband antennas must be mounted on a radius of 22 feet from the center of the counterpoise and evenly spaced at 7.5 intervals. They must be uniform in height and aligned with the carrier antenna which is mounted at the center of the counterpoise. There are two methods used in locating the sideband antennas on the counterpoise mounting rail: the theodolite method and the tape measure and spirit level method. The theodolite method is preferred as precision and accuracy insure a better signal in space. E


9-1


9.4.2 Theodolite Method.- Refer to figure 9-1. a.

Unpack and set up Theodolite in the center of the sideband mounting rail.

b.

Using a compass identify magnetic North (0 ) and mark it on mounting rail.

E

Figure 9-1. Antenna Spacing on Counterpoise Mounting Rail Using Theodolite. 9-2



c.

Unpack all 48 sideband antenna pedestals. Scribe a line in the center of the antenna pedestal base on the same side as the access panel.

d.

Locate the North (0 ) point on mounting rail with theodolite. Set theodolite scale to 0 .

e.

Rotate the theodolite 7.5 and mark this point on mounting rail. Rotate theodolite another 7.5 and mark this point on mounting rail. Continue this procedure all the way around the mounting rail until you arrive back to the 0 mark.

E

E

E

E

E

f.

Evenly space all 48 sideband antenna pedestals (Part No. 950392-0001) on the mounting rail using the scribe marks to locate position. The antenna pedestals should have their access panels facing towards the center of the array.

g.

Insure the sideband antenna pedestal number 1 is exactly centered on the North (0 ) line of the mounting rail as seen from the center of the array.

h.

Check antenna pedestal position using theodolite.

i.

If position is correct, clamp sideband antenna pedestal to mounting rail using four vise grip type (or equalivant) clamps.

j.

Using a 3/8 inch transfer punch, mark the mounting rail where the four mounting hole are to be drilled.

k.

Drill four 3/8 inch holes in mounting rail.

l.

Using the theodolite and .395" x 3/4" slotted washers (Part No. 137002-0014), as shims, level sideband antenna pedestal vertically and horizontally.

m.

Attach sideband antenna pedestal #1 to counterpoise mounting rail, using appropriate hardware, as shown in figure 9-2.

n.

Rotate throdolite 7.5 and check position of the next sideband antenna pedestal. If position is correct attach sideband antenna pedestal to mounting rail as detailed in steps i thru m.

o.

Continue to the process of checking the position of the sideband antenna pedestals, clamping them to the mounting rail, drilling the mounting holes, and bolting them to the mounting rail until all the sidebnad antenna pedestals have been securely attached to the mounting rail.

p.

Make sure sideband antenna orientation is correct as shown in figure 9-1, attach sideband antenna assembly (Part No. 080001-0001) to sideband pedestal using appropriate hardware.

E

E


9-3


Figure 9-2. Antenna Placement on Mounting Rail.

9-4



q.

The antennas must radiate in line with their respective radial; that is, every other antenna must be 180 degrees out from the other, refer to figure 9-1. At the same time, insure that the slot of the Alford loop antenna is on a radial with the center of the array.

r.

Place antenna radomes (Part No. 950394-0001) on sideband antennas to protect the radiating elements in case of inclement weather.

9.4.3 Tape Measure and Spirit Level Method.E

a.

Using a compass identify magnetic North (0 ) and mark it on counterpoise mounting rail. Make sure you are standing far enough away from the counterpoise so the steel in its construction will not interfere with the compass.

b.

Using a compass identify South (180 ) and mark it on counterpoise mounting rail.

c.

Using a compass identify East (90 ) and West (270 ) and mark them on counterpoise mounting rail.

d.

Refer to figure 9-3. Evenly space all 48 sideband antenna pedestals (Part No. 950392-0001) on the mounting rail. The antenna pedestals should have their access panels facing towards the center of the array.

e.

Place the first sideband antenna pedestal, sideband antenna #1, exactly centered on the North line of the support rail as seen from the center of the array.

f.

Measure 34.53 inches from North line (0 point on counterpoise) and mark this point on counterpoise mounting rail. Center sideband antenna pedestal, sideband antenna #2, on this point.

g.

Using the North line as a starting point and while adding 34.53 inches to each pervious measurement, measure and mark locations for sideband antennas #3 through #13 on counterpoise mounting rail. Thus, sideband antenna #3 would be 69.06 inches from North line, sideband antenna #4 would be 103.59 inches from North line, and sideband antenna #5 would be 138.1 2 inches from North line, etc.

h.

Locate the South line as previously marked (in step b.) on counterpoise mounting rail. Place sideband antenna pedestal, for sideband antenna #25, exactly centered on this point as s een from the center of the array.

i.

Measure 34.53 inches from South line (180 point on counterpoise) and mark this point on counterpoise mounting rail. Center sideband antenna pedestal, sideband antenna #24, on this point.

E

E

E

E


E

9-5


j.

Using the South line as a starting point and while adding 34.53 inches to each pervious measurement, measure and mark locations for sideband antennas #23 through #14 on counterpoise mounting rail. Thus, sideband antenna #23 would be 69.06 inches from South line, sideband antenna #22 would be 103.59 inches from South line, and sideband antenna #21 would be 138.12 inches from South line, etc.

k.

Measure 34.53 inches from North line (0 point on counterpoise) and mark this point on counterpoise mounting rail. Center sideband antenna pedestal, sideband antenna #48, on this point.

l.

Using the North line as a starting point and while adding 34.53 inches to each pervious measurement, measure and mark locations for sideband antennas #47 through #37 on counterpoise mounting rail. Thus, sideband antenna #47 would be 69.06 inches from North line, sideband antenna #46 would be 103.59 inches from North line, and sideband antenna #45 would be 138.12 inches from North line, etc.

m.

Measure 34.53 inches from South line (180 point on counterpoise) and mark this point on counterpoise mounting rail. Center sideband antenna pedestal, sideband antenna #26, on this point.

n.

Using the South line as a starting point and while adding 34.53 inches to each pervious measurement, measure and mark locations for sideband antennas #27 through #36 on counterpoise mounting rail. Thus, sideband antenna #27 would be 69.06 inches from South line, sideband antenna #28 would be 103.59 inches from South line, and sideband antenna #29 would be 138.12 inches from South line, etc.

o.

Clamp sideband antenna pedestal #1 to mounting rail using four vise grip type (or equalivant) clamps.

p.

Using a 3/8 inch transfer punch, mark the mounting rail where the four mounting hole are to be drilled.

q.

Drill four 3/8 inch holes in mounting rail.

r.

Using a carpenter's level and .395" x 3/4" slotted washers (Part No. 137002-0014), as shims, level the sideband antenna pedestals vertically and horizontally.

s.

Attach sideband antenna pedestal #1 to counterpoise mounting rail, using appropriate hardware, as shown in figure 9-2.

t.

Attach sideband antenna pedestal #2 to mounting rail as detailed in steps o thru s.

u.

Continue to the process of clamping sideband antenna pedestals to the mounting rail, drilling the mounting holes, and bolting them to the mounting rail until all the sidebnad antenna pedestals have been securely attached to the mounting rail.

v.

Attach sideband antenna assembly (Part No. 080001-0001) to sideband pedestal using appropriate hardware.

9-6

E

E

Rev. A April, 1993


Figure 9-3. Antenna Spacing on Counterpoise Mounting Rail Using Sight and Measurement.

Rev. A April, 1993

9-7


w.

The antennas must radiate in line with their respective radial; that is, every other antenna must be 180 degrees out from the other, refer to figure 9-3. At the same time insure that the slot of the Alford loop antenna is on a radial with the center of the array.

x.

Place antenna radomes (Part No. 950394-0001) on sideband antennas to protect the radiating elements in case of inclement weather.

9.4.4 Carrier Antenna Installation.- Refer to figures 9-2 or 9-4 as applicable. a.

Place carrier antenna pedestal in the center of the counterpoise.

b.

Attach carrier antenna mast to counterpoise, using appropriate hardware

c.

Using a carpenter's level or a theodolite and .395" x 3/4" slotted washers (Part No. 137002-0014) as shims, level the carrier antenna mast vertically and horizontally.

Figure 9-4. Carrier Antenna Pedestal Installation Diagram.

9-8

Rev. A April, 1993


9.4.5 Cutting Antenna Feed Cables to Proper Electrical Length.a.

Measure and cut 49, fifty foot lengths of RF antenna cable.

b.

Install type-N connector (Part No. 180303-0001) on one end of the RF feed cable as detailed in figure 9-5.

Figure 9-5. RF Connector Assembly Diagram. Rev. A April, 1993

9-9


c.

Label antenna cables at both ends using a tube type marker (Part No. 900115-0001). Label one cable with a "C" to indicate carrier antenna cable. Label the remaining cables 1 through 48, this will indicate which sideband antenna the cable will go to.

d.

Connect vector voltmeter, signal generator, and bi-directional coupler as detailed in figure 9-6.

Figure 9-6. Equipment Setup for Cutting RF Cables to Proper Electrical Length. e.

Set signal generator to operating frequency of station, 0 dB output.

f.

Find the electrically shortest cable and calibrate the vector voltmeter to 0 on that cable.

g.

Trim all remaining cables to within 2 of the cable used in calibration.

9-10

E

E

Rev. A April, 1993


h.

Install type N-connector on the other end of RF feed cables as detailed in figure 9-5.

i.

Recheck the phase length of each RF feed cables to insure uniform length. Tag the RF cable with the shortest electrical phase length. The tag should include the phase length of the cable and the operating frequency it was checked at. This cable will be used as a reference in case an RF feed cable fails in the future.

j.

Route RF feed cables to their respective antennas.

k.

Connect RF feed cable, positioning piece, tuning stub, and RF Tee connector as shown in figure 9-7.

l.

Connect 180 balun to antenna connectors J2 and J3.

E

Figure 9-7. Diagram of RF Feed Cable, Tuning Stub, RF Tee Connector, and Positioning Piece Connections. 9.4.6 Tuning the Antennas.a.

Using an ohmmeter, check all 50 ohm dummy loads. Replace those that are not 50 ohms ±1 ohm.

b.

Connect bi-directional coupler, vector voltmeter, signal generator, 50 ohm dummy loads, and Tee connectors as shown in figure 9-8.

Rev. A April, 1993

9-11


E

Figure 9-8. Equipment Setup for Calibrating Vector Voltmeter for 0 .

c.

Set signal generator to operating frequency of the DVOR station with an output of 0 dB.

d.

Calibrate vector voltmeter for 0 .

e.


9-12

E

Rev. A April, 1993


Figure 9-9. Equipment Setup for Tuning the Antennas.

f.

Connect antenna 1's RF feed cable to the bi-directional coupler. Dummy load the opposite sides of the antennas; antenna 48 would be dummy loaded as well as antenna 2. This will prevent reflections.

g.

While monitoring the vector voltmeter for VSWR and with a person on the counterpoise check the VSWR of antenna 1. Adjust the tuning capacitor for a VSWR of 1.10 or lower. If the capacitor will not bring the antenna's VSWR within specifications it may be necessary to trim the antenna tuning stub.

h.

If trimming the antenna tuning stub is necessary trim approximately 1/8 to 1/4 of an inch each time. After trimming tuning stub adjust tuning capacitor to determine if the antenna's VSWR will drop to 1.1 or below.

i.

Connect bi-directional coupler to feed cable for antenna number 2 and dummy load the feed cables for antenna numbers 1 and 3.

j.

Tune antenna number 2 as detailed in steps g and h.

Rev. A April, 1993

9-13


k.

Repeat steps f thru h for sideband antennas 3 and 4 remembering to dummy load adjacent antennas to prevent reflections.

l.

Once sideband antennas 1 through 4 have been tuned, recheck the previously tuned antennas to insure VSWR has not changed. This step is necessary because the sideband antennas react with each other. Retune antennas as necessary.

m.

Tune sideband antenna numbers 5 through 8 periodically rechecking previously tuned antennas. Continue this process until all sideband antennas have been tuned.

n.

Connect RF carrier antenna cable to bi-directional coupler.

o.

Adjust tuning capacitor or air-dielectric capacitor (depending on antenna) for a VSWR reading of 1.1. If the capacitor will not bring the antenna's VSWR within specifications it may be necessary to trim the antenna tuning stub.

p.

If trimming the antenna tuning stub is necessary trim approximately 1/8 to 1/4 of an inch each time. After trimming tuning stub adjust tuning capacitor to determine if the antenna's VSWR will drop to 1.1 or below.

9.4.7 Adjusting Phase Length of Sideband Antennas To Carrier Antenna.a.


b.

Set signal generator to operating frequency of the DVOR station with an output of 0 dB.

c.

Calibrate vector voltmeter for 0 using the feed cable to sideband antenna 1 as a reference.

d

Measure and record the phase length of each sideband antenna in relation to the carrier antenna.

e.

Determine the mean phase length of the sideband antenna RF feed cables. All sideband antennas must be within 10 of each other.

E

E

9-14

Rev. A April, 1993


Figure 9-10. Test Equipment Setup for Sideband Antenna to Carrier Antenna Phasing.

f.

Trim sideband antenna RF feed cables or add elbows to antenna RF feed cables that are out of tolerance.

Rev. A April, 1993

9-15


9.4.8. Field Monitor Antenna Foundation Installation.- Refer to section 8 parts list, for a complete list of materials inclused in the Civil Installation Kit Rohn Antenn a (Part No. 470252-0001). Figure 9-11 shows a typical DVOR Field Monitor Antenna foundation installation. DVOR Field Monitor Antenna foundation installation may vary per local building codes.

9.4.9 Field Monitor Antenna (470178-0001) Installation.- Refer to section 8 parts list, for a complete list of materials included in the single Doppler Feild Monitor Antenna Kit (part no. 470178-0001). Figure 9-12 shows a typical DVOR field monitor antenna and tower. a.

Refer to figure 9-13. Set a 10 foot tower section (MP3) on foundation tower section (MP4, buried in concrete). Insure that bottom of tower is down. Secure the two sections together with six machine screws (1/4-20 x 1-1/2"), flat washers (1 x 1/4"), and hex nuts (1/4-20). Insure that terminal lug (grounding strap) (MP1) is attached to the tower. Attach the No. 6 AWG Copper Wire (part no. 146006-0000) to the tower terminal lug and the ground rod (MP2).

b.

Set the last 10 foot tower section (MP3) on second tower section (MP3). Insure that bottom of tower is down. Secure the two sections together with six machine screws (1/4-20 x 1-1/2"), flat washers (1 x 1/4"), and hex nuts (1/4-20).

c.

Secure three moisture caps (MP19) to the tower top.

d.

Secure the two unistrut mounting rails (MP10) to top of tower with clamps (MP9) as shown. Before tightening the top rail, insure that rail is level and centered.

e.

Install two clamps (MP5) and U-bolts (MP8) to Unistrut mounting rails (MP10) using U-bolts (MP8) and appropriate attaching hardware, do not tighten.

f.

Assemble the single Yagi antenna assembly (MP16) per instructions supplied with the antenna. Install clamps, U-bolts, and attaching hardware to the antenna boom clamp, do not tighten.

g.

Install EMT pipe (MP7) and secure with clamps (MP5) and U-bolts (MP8).

h.

Slide the antenna on to the EMT pipe (MP7) and secure with U-bolts supplied with the antenna.

i.

After antenna is secured, secure the antenna boom cap (MP6).

9-16

Rev. A April, 1993


THIS SHEET IS INTENTIONALLY

9-18

Rev. A April, 1993


Figure 9-12. Typical DVOR Field Monitor Antenna and Tower (Part No. 470178-0001). Rev. A April, 1993

9-19


j.

Using the appropriate hardware attach clamps (MP11 and MP12) to tower (MP3) as shown.

k.

Assemble weather protection collar (MP13), conduit (MP15), 90 degree conduit elbow (MP17), and connector (MP18), then secure to tower clamps (MP11). After conduit is attached to tower, connect conduit (MP15) to 90 degree conduit elbow (MP17) using connector (MP18).

9.4.10 Field Monitor Antenna (470178-0002) Installation.- Refer to section 8 parts list, for a complete list of materials included in the Doppler Feild Monitor Antenna Kit (part no. 470178-0002). Refer to figure 914.

a.

Set a 10 foot tower section (2) on foundation tower section, buried in concrete. Insure that bottom of tower is down. Secure the two sections together with six machine screws (1/4-20 x 1-1/2"), flat washers (1 x 1/4"), and hex nuts (1/4-20). Insure that terminal lug (grounding strap) (3) is attached to the tower. Attach the No. 6 AWG Copper Wire (part no. 146006-0000) to the tower terminal lug.

b.

Set the last 10 foot tower section (2) on first tower section (2). Insure that bottom of tower is down. Secure the two sections together with six machine screws (1/4-20 x 1-1/2"), flat washers (1 x 1/4"), and hex nuts (1/4-20).

c.

Set the top tower section (8) on second tower section (2). Insure that bottom of tower is down. Secure the two sections together with six machine screws (1/4-20 x 1-1/2"), flat washers (1 x 1/4"), and hex nuts (1/4-20).

d.

Assemble the single Yagi antenna assembly (6) per instructions supplied with the antenna. Install clamps, U-bolts, and attaching hardware to the antenna boom.

9-20

Rev. A April, 1993

Figure 9-13. DVOR Field Monitor Antenna and Tower (Part No. 470178-0001) Parts Location Diagram


Model 1150 DVOR Antenna

Figure 9-14.

DVOR Field Monitor Antenna and Tower (Part No. 470178-0002) Parts Location Diagram

Rev. A April, 1993

9-23


THIS SHEET IS INTENTIONALLY BLANK

9-24

Rev. A April, 1993


SECTION 10. SOFTWARE



10-1



10-2



SECTION 11. TROUBLESHOOTING SUPPORT DATA

11.1 INTRODUCTION.- This section contains parts location illustrations for the DVOR antenna array. Table 11-1 contains a list of assembly and installation drawings necessary to install the DVOR antenna array. Table 11-1. Assembly and Installation Diagrams.

Description Assembly, DVOR Antenna Kit

Rev. A April, 1993

Drawing Number 470165

Figure Page 11-1

11-3

11-1

Vor Antenna

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