Installation and Operating Instructions
Table Of Contents
- AND
- MW-CBDA-TDMAB-1W60-A
- CELLULAR
- BI-DIRECTIONAL AMPLIFIER
- BDA with AGC & MGC
- DETAILED RF BLOCK DIAGRAM
- _
- 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
- 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.
Wireless Solutions
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BDA OVERVIEW:
The Bi-Directional Amplifier (BDA) assembly provides an exceptional repeater/booster performances to
extend the coverage area of radio communications in buildings and RF shielded environments.
Features such as high linearity power amplifiers are contributing for the overall improved system linearity
performances. The unit is based on a duplexed path configuration, having sharp out of band attenuation
for improved isolation between the receiving and transmitting paths.
BLOCK DIAGRAM DESCRIPTION:
The CBDA Downlink path receives the RF signals from base station amplifies them and transmits them
to the subscriber. The BDA Uplink path receives the RF signals from the subscriber amplifies them and
transmits them to the base station. Two duplexers frequency separate the signals to the proper
amplifying path and isolate the two signals.
For each path there is an AGC amplifier. The amplifier has an AGC option switch. When switched on,
the AGC circuit limits the amplifier output power. The AGC circuit senses the output power and
introduces more attenuation, when the output power exceeds the preset level. This way the gain of the
amplifier is reduced, its output power is limited and the intermodulations products are kept below the
desired level.
In this manner the output power cannot exceed the +24 dBm preset power and the IMD levels are
13 dBm.
The AGC amplifier has a Power LED lamp that illuminates when the output power has reached the
preset power limit.
In addition the BDA has a trimmer that enables continuos reduction of the gain by 15 dB.