Radio Frequency by Steve Winder and Joe Carr - HTML preview

11.8 Example of microwave link plan

Frequency: 2000 MHz
Antenna type, station A: P6F-17C Antenna type, station B: P6F-17C Feeder type, station A: LDF5P50A Total length, antenna to equipment Feeder type, station B: LDF5P50A Total length, antenna to equipment height agl. 20 m height agl. 20 m

loss, dB/100 m 6.46
30 m loss, dB/100 m 6.46
30 m

Performance
Path length: 20 km, therefore clear path loss 124.0 dBi Obstruction loss 0.0 dB Feeder loss, station A: 1.9 dB Feeder loss, station B: 1.9 dB Feeder tail loss, total for link 1.5 dB Connector loss, total for link 1.5 dB

Total loss 130.8 dB Gain, antenna A 28.6 dB Gain, antenna B 28.6 dB Total gain 57.2 dB Nett loss (total loss – total gain) 73.6 dB Receiver threshold for max. signal/noise −125.0 dBW Design fade margin +30.0 dB Design receiver input level −95.0 dB (threshold – fade margin)
Transmitter output power −21.4 dBW (receiver input – nett loss)