User's Manual

Shaded Area
A valley is shaded by hills. There is a base station 5 kilometers away, but
the lowest signal strength in the valley is less than –100dBm. A mast
used for other purposes is available for a repeater installation. The mast
height is 42 meter and it is located on a hill. The scenario is illustrated
in Figure 2-2.
The donor antenna of the repeater was mounted at the top of the mast
and the service antenna was mounted at the half mast. The antenna
isolation was measured to over 100dB. The repeater was set to max.
80dB gain.
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
The measured result in the valley was better than –90dBm.
Donor antenna
Service antenna
Figure 2-2. Repeater coverage of shaded area
ALLGON System AB AR Repeaters & OMT32 Hardware – Introduction
User’s Manual VD202 90/EN Rev. 1A 1999-07 2 - 4