Help predict the corrosion rate of carbon steel in sour environment
flareDescripción completa
antenna
distributed antenna system for the enterprise
microstrip antenna for DTH application.
Antenna Andrew dscription
Astrology and predicting the future are often linked together. Does astrology predict the future and, if so, how does that work? You would think if astrologers could predict something like t…Full description
Parapet Height (optional): (ph) Distance from Building Edge: (L)
5
0
0.235619
_
4.84126
5
theta=(alpha/2 + dt +beta)
4.84126
. 4.84126 .
10
4.84126 .
15
Roof and Parapet
Minimum Height to Center of Antenna:
_
20
Ant. Height
H = tan (theta) (theta) * L + ph
3 dB Beamwidth
Guardband
*A more detailed drawing and the form ulas used can be found on the Drawing & Formulas tab of this worksheet.
A vertical protection margin of ~8 deg is recommeded for most cases. In dense urban areas, a lower margin is acceptable
Page 1
Rooftop Clearence
QUICK PREDICT®
Quick Predict --Theoretical 3 db prediction of Cell Boundry
Cell Boundry Prediction Tool 900
Antenna Height: (H_antenna)
646
X_earth 800 ) 0 m 700
Mobile Height: (H_mobile)
1.5
6009216.8
Vertical Beamwidth (degrees): (ALPHA)
10
Electrical Downtilt (EDT)
4
Mechanical Downtilt: (MDT)
0
(BETA) Radius of the "near" 3dB theoretical boundry: (m) Theoretical Radius of the Max Lobe: (m) Radius of the "far-" 3dB theoretical boundry: (m)
4
( t h g i e H a n n e t n A
Y_Mast 646
Y_mobile Y-main beam Y_3dbBeam 1.5
. 0.0 . 0 . 0 .
500 400 300 200 100 0
0
=
4069.2 9216.8 -36923.4
646 .
. 1000
+
2000
3000
4000
5000
646 . 646
806.8794829 6000 7000
8000
9000
Cell Radius (m) Antenna
Mobile
Upper theoretical 3dB boundry is above horizon
*A more detailed drawing and the formulas used can be found on the Drawing & Formulas tab of this worksheet.
3 dB Beamwidth
Max Lobe
Rooftop Clearence
QUICK PREDICT®
Quick Predict --Theoretical 3 db prediction of Cell Boundry
Cell Boundry Prediction Tool 900
Antenna Height: (H_antenna)
646
X_earth 800 ) 0 m 700
Mobile Height: (H_mobile)
1.5
6009216.8
Vertical Beamwidth (degrees): (ALPHA)
10
Electrical Downtilt (EDT)
4
Mechanical Downtilt: (MDT)
0
(BETA) Radius of the "near" 3dB theoretical boundry: (m) Theoretical Radius of the Max Lobe: (m) Radius of the "far-" 3dB theoretical boundry: (m)
4
( t h g i e H a n n e t n A
Y_Mast 646
Y_mobile Y-main beam Y_3dbBeam 1.5
. 0.0 . 0 . 0 .
500 400 300 200 100 0
0
=
646 .
. 1000
+
2000
3000
4000
806.8794829 6000 7000
8000
9000
Cell Radius (m)
4069.2 9216.8 -36923.4
Antenna
Mobile
Upper theoretical 3dB boundry is above horizon
*A more detailed drawing and the formulas used can be found on the Drawing & Formulas tab of this worksheet.
Page 2
Rooftop Clearence
10000
5000
646 . 646
3 dB Beamwidth
Max Lobe
Rooftop Clearence
10000
Page 3
IM Interference
Enter Downlink
QUICK PREDICT®
947.6 MHz to
Intermodulation Interference Prediction Tool Intermodulation interference may occur when a site is co-located near another transmitting device.
Uplink Range: 902.6 MHz to
This tool predicts possible 3rd order intermod products and warns if they are in a PCS band. Enter Possible
I 925 MHz to
Actually predicting IM interference is much more complicated and requires careful analysis and often measurements.
Block A B
Frequency Blocks in the GSM 900 Band Bandwidth Uplink Range Downlink Range ARFCN 12.5 MHz 890-902.5 MHz 935-947.5 MHz 1-62 12.5 MHz 902.5-915 MHz 947.5-960 MHz 63-124
Block A B C
Frequency Blocks in the PCS 1900 Band Bandwidth Uplink Range Downlink Range 15 MHz 1850-1865 MHz 1930-1945 MHz 15 MHz 1870-1885 MHz 1950-1965 MHz 15 MHz 1895-1910 MHz 1975-1990 MHz
ARFCN 512-585 612-685 737-810
Possible DOWN 960.2 MHz to 890 MHz to Possible UPLIN 870.2 MHz to 935 MHz to
IM Interference
Enter Downlink
QUICK PREDICT®
947.6 MHz to
Intermodulation Interference Prediction Tool Intermodulation interference may occur when a site is co-located near another transmitting device.
Uplink Range: 902.6 MHz to
This tool predicts possible 3rd order intermod products and warns if they are in a PCS band. Enter Possible
I 925 MHz to
Actually predicting IM interference is much more complicated and requires careful analysis and often measurements.
Block A B
Frequency Blocks in the GSM 900 Band Bandwidth Uplink Range Downlink Range ARFCN 12.5 MHz 890-902.5 MHz 935-947.5 MHz 1-62 12.5 MHz 902.5-915 MHz 947.5-960 MHz 63-124
Block A B C D E F
Frequency Blocks in the PCS 1900 Band Bandwidth Uplink Range Downlink Range 15 MHz 1850-1865 MHz 1930-1945 MHz 15 MHz 1870-1885 MHz 1950-1965 MHz 15 MHz 1895-1910 MHz 1975-1990 MHz 5 MHz 1865-1870 MHz 1945-1950 MHz 5 MHz 1885-1890 MHz 1965-1970 MHz 5 MHz 1890-1895 MHz 1970-1975 MHz
Possible DOWN 960.2 MHz to 890 MHz to Possible UPLIN 870.2 MHz to 935 MHz to
Error Messages Reguarding Possible IM Products DL OK UL OK DL OK Possible IM products in UPLINK band DL OK Possible IM products in UPLINK band Possible IM products in DOWNLINK band UL OK
Page 4
IM Interference
ange: 960
915 terfering Frequency Range: 935 INK associated 3rd order IM products : 995 922.4 associated 3rd order IM products : 905 967.4
Page 5
Drawing & Formulas
Antenna Antenna beam width (a)
a/2
X
H
tan(a w / H
2 =
+
b ) = H L
X
-h
b : tilts (elec. and mecan.) + protection L
h
X
Building roof top
L
=
=
tan
(X
(a
-
2
h
+
)
b
) tan
* L
a 2
+
+
h
Parapet (h)
b
Formulas used for calculating the roof top clearance.
