Lindsay FIRLDNET GSM CELLULAR RTU, Руководство по установке

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P/N 1389990 Rev B (ECN 32099) 74 Spread Spectrum Installation Guide
An extension Cable will reduce the power that reaches the RTU. An online
coaxial line loss calculator can be found at
http://www.saarsham.net/coax.html .
The following table summarizes the power output after the specified length of
cable:
Coaxial Cable
Length RG-58C LMR-400 LMR-900
20 feet 37.8% 83.6% 92.5%
50 feet 8.8% 64.0% 84.6%
100 feet 0.8% 40.9% 67.7%
250 feet n/a 10.7% 37.8%
Even with 100 feet of LMR-400 there are working installations with two standard
12-1546-0 directional antennas communicating over 10 miles.
Part Number Description Length
14-0830-0 CABLE,RF,10',N(M) TO N(F) 10 feet
14-0831-0 CABLE,RF,25',N(M) TO N(F) 25 feet
14-0832-0 CABLE,RF,50',N(M) TO N(F) 50 feet
14-0833-0 CABLE,RF,75',N(M) TO N(F) 75 feet
14-0834-0 CABLE,RF,100',N(M) TO N(F) 100 feet