User's Manual

AR Standard Repeater Using Repeaters
1-14 044-05250 Rev A
Shaded Area
In this example, we have a valley that is shaded by the hills surrounding it. There is a base
station 5 kilometers away but the lowest signal strength in the valley is less than –100dBm. A
42 meter mast used for other purposes is located on one of the hills and is available for a
repeater installation as illustrated in Figure 1-12.
The donor antenna was mounted at the top of the mast and the service antenna was mounted
at half mast on the other side. Antenna isolation was measured to over 100dB and the repeater
was set to 80dB gain.
The measured result in the valley was better than –90dBm.
Figure 1-13 Repeater coverage of shaded area.
Measured levels: Received signal level – 60.0 dBm
Donor antenna gain 15.0 dBi
Cable loss – 5.0 dB
Repeater input level –50.0 dBm
Adjusted repeater gain 70.0 dB
Repeater output level 20.0 dBm
Cable loss – 5.0 dB
Service antenna gain 8.0 dBi
Radiated output level 23.0 dBm
Donor antenna
Service antenna