User's Manual

Page 14 of 21
IDEN Digital Repeater Installation
Manual
10.3 ANTENNA ISOLATION
For proper operation the isolation between these two antennas must be at least 10 dB higher than
the BDA gain. Lower isolation would lead to high in-band ripple.
Oscillations will build up when the isolation is lower than BDA gain.
The isolation between the antennas is critical for high gain outdoor repeaters.
To measure the isolation, inject a known signal into one antenna and measure the coupled output
at the other antenna. This should be done across the frequency range of both uplink and downlink
bands.