Installation and Operating Instructions

AGC & MGC Function
The CBDA 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 CBDA 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 counter-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.
Warning: The AGC switch must be always ON in order to limit the spurious signals.
AGC & MGC Control
(Control Window Located at BDA sides)
Gain Control
Trimmer
(MGC)
Power
Out
LED
AGC
Enable
Switch
Dekolink Wireless Ltd.;16 Bazel St.Qiryat-Arieh Petah-Tikva Israel, 49510
Tel- 972-3-9180-180; Fax-972-3- 190-9180 ; [e-mail]
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www.dekolink.com rev 0 11/04 page 6 of 16