Codan Radio Radio Repeater Systems Training Guide - Manual (Page 55)

RADIO REPEATER SYSTEM | TRAINING GUIDE
Appendix D: Calculating Signal Levels Page 47
PATH CALCULATION WORKSHEET
Terminal 1 BRIDGE ARS
Terminal 2 OFFICE
Transmitter power 4.0 watts(W) = 10(log W) = +6.0 dBW
Cable, fi lter and connector loss (-0.9, -1.5, -1.0) -3.4 dB
Antenna input power +2.6 dBW
Antenna gain +6.0 dB
Effective radiated power +8.6 dBW
Propagation calculations:
Free space loss -89.0 dB
Shadow loss:
Obstruction 1 -35.0 dB
Obstruction 2 dB
Obstruction 3 dB
Other losses dB
Total -124 dB -124.0 dB
Received signal strength -115.4 dBW
Antenna gain +6.0 dB
Cable, fi lter, and connector loss (-1.4, -0.5) -1.9 dB
Receiver input signal S = -111.3 dBW
Effective receiver threshold T = -137 dBW
Difference between S and T (Useful fade margin) 25.7 dB
Signal level: Anti log(fade margin/20) = 19.3 (μV) microvolts