Installation and Operating Instructions

Wireless Solutions
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AGC & MGC FUNCTION
The BDA has AGC function. Their amplifier has a directional coupler and a detector at the output of the
high power amplifier to monitor the output power. When a high signal is received the automatic level
control detects the amplitude and sends a feedback signal to a voltage variable attenuator which
attenuates the signal level so that the output power of the amplifier does not exceed the preset limit. The
LED on the amplifier illuminates when the power out the amplifier is within the set limit (both when the
AGC is On and when the AGC is OFF).
The switch on the RF amplifier enables the AGC function. If the AGC is disabled then the amplifier gives
maximum gain.
MGC:
The RF gain of the BDA can be reduced by about 15 dB using the continuos trimmer on the
amplifier. The RF gain is at maximum when the trimmer is at anti-clockwise direction. To reduce the
gain, turn the trimmer clockwise using a screwdriver. Turning it halfway would reduce the gain by 7.5 dB.
The AGC and MGC functions for the uplink path are reached by opening a small cover located on the
DBA side adjacent to the Mobile antenna port. For the downlink path the window is located on the side
near the Base antenna port.
Note:
The BDA is shipped with the AGC switch in the OFF position and maximum RF gain.
AGC
Enable
Switch
Power
Out
LED
G
ain Control
Trimmer
(MGC)
AGC & MGC CONTROL
(Control Window Located at BDA sides)