8
| How to Choose the Right Antenna
Wireless Antenna Installation Guide |
9
N-Female
-0.5 dB
-1 dB
-0.5 dB
-0.5 dB
10 ft cable
1 ft cable
N-Male
N-Male
N-Male
RP-SMA
Radio
Lightning Arrestor
N-Female
N-Female
-0.5 dB
-0.5 dB
-0.5 dB
-0.5 dB
-1 dB
100 ft cable
5 ft cable
N-Male
N-Male
N-Male
N-Male
RP-SMA
Radio
Lightning Arrestor
Total Signal Loss Calculation
Connectors (3) = -1.5 dB
Lightning Arrestor = -1.0 dB
Cable (11 ft) = -0.429 dB
Total = -2.929 dB
Total Signal Loss Calculation
Connectors (4) = -2.0 dB
Lightning Arrestor = -1.0 dB
Cable (105 ft) = -4.095 dB
Total = -7.095 dB
LOWER LOSS, LONGER RANGE
HIGHER LOSS, SHORTER RANGE
How Too Many Connectors
Affect dB Loss
Example Antenna
Gain Calculation
For a 900 MHz, 1W radio to achieve a
5 mile distance: Overall gain required =
>6 dB (see Tip 3).
Signal lost across a 11 ft antenna cable
(LMR400) and a lightning arrestor =
-2.929 (approximately -3 dB).
Antenna gain required =
6 dB + 3 dB = 9 dB
Note:
A Lightning Arrestor is strongly
recommended for outdoor applications.
Summary of Contents for Wireless Antenna
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