Wilson Electronics LLC 274106SB ユーザーズマニュアル
13
Factor Conversions
Using the table below, fi nd and circle the appropriate decibel (dB) numbers that correspond
to the equipment in your particular system. Be sure to choose your numbers from the
appropriate frequency column, based on the service you receive (iDEN, Cellular or PCS).
to the equipment in your particular system. Be sure to choose your numbers from the
appropriate frequency column, based on the service you receive (iDEN, Cellular or PCS).
Frequency
iDEN
851 / 901
Cellular
869
PCS
1930
Antenna Factor (AF)
Low Profi le (inside)
+3 dB
+3 dB
+3 dB
Dual-Band Panel (inside)
+7 dB
+7 dB
+7 dB
Dual-Band Dome (inside)
+2 dB
+2 dB
+2 dB
Dual-Polarity Dome (inside)
+5 dB
+5 dB
+5 dB
Yagi 806-939 MHz Cellular (outside)
+13 dB
+13 dB
+13 dB
Yagi 800-900 MHz Cellular (outside)
+10 dB
+10 dB
+10 dB
Yagi 880-965 MHz (outside)
+10 dB
+10 dB
+10 dB
Yagi 1800-1900 MHz PCS (outside)
+13 dB
+13 dB
+13 dB
Cable Factor (CF)
20’ RG 58
-4 dB
-4 dB
-7 dB
20’ 9913
-3 dB
-3 dB
-4 dB
30’ 9913
-3 dB
-3 dB
-5 dB
50’ 9913
-4 dB
-4 dB
-7 dB
100’ 9913
-7 dB
-7 dB
-10 dB
Splitter Factor (SF)
-3 dB
-3 dB
-3 dB
Tap Factor (TF)
(depends on model - refer to tap label)
-6/-10 dB
-6/-10 dB
-6/-10 dB
Use the following formula to calculate your Signal Strength (S). Write in your numbers
as appropriate. Be sure to account for the length of all cable, inside and out. Add up the
numbers for all taps and/or splitters (if you are not using any, enter 0). Remember, AG and
AF will be positive numbers; OSL, CF, TF, SF and S will be negative.
as appropriate. Be sure to account for the length of all cable, inside and out. Add up the
numbers for all taps and/or splitters (if you are not using any, enter 0). Remember, AG and
AF will be positive numbers; OSL, CF, TF, SF and S will be negative.
OSL
+
AG
+
AF
+
CF
+
SF
+
TF
=
S
Once you have calculated your signal strength, use the graph on the following page to
determine approximate coverage distance. See below for a sample calculation.
determine approximate coverage distance. See below for a sample calculation.
Sample Signal Strength and Coverage Calculation
This example assumes an OSL of -90, use of a 60 dB cellular amplifi er, an 806-939 MHz
Yagi antenna and a low profi le inside antenna with 100 total feet of inside and outside 9913
cable with no splitters or taps.
Yagi antenna and a low profi le inside antenna with 100 total feet of inside and outside 9913
cable with no splitters or taps.
OSL
-90 (always a negative number) found on cell phone in test mode
AG +60
gain
AF
+16 dB gain (+13 dB for the Yagi antenna and +3 dB for the low-profi le antenna)
CF
-7 dB loss
SF
0 (none used)
TF
0 (none used)
Formula: -90 + 60 + 16 + -7 + 0 + 0 = -21
With a signal strength of -21, coverage distance would be approximately 120
feet from the inside antenna.
feet from the inside antenna.