User's Manual

Setting up the CMD Maximum Gain
The CMD can be used either as an On Channel Repeater (OCR) or as a translator. In the
OCR mode, the CMD receive and transmit frequency is the same as opposed to the
Translator mode, in which the receive and transmit frequencies are different. The Gain range
is 70 to 140dB in OCR mode and 70 to 165dB in Translator mode. However, the gain is
limited by the isolation that can be achieved between the rest of the RF system i.e. cables,
antennas, filtering etc. The maximum Gain setting must be at least 10 dB lower than the
measured overall isolation in order to prevent CMD lock up.
Once the CMD is programmed, installed and connected to the rest of the filtering / antenna
system, the Maintenance screen can be used for measuring the isolation and setting up the
gain. No extra test equipment is required.
Open the Maintenance screen from the CMD Setup pull down menu. The Maintenance
screen is not a programming screen. It is used for diagnostic and setup only. The fields seen
on the Maintenance screen are described in the previous sections with the exception of the
measured data fields shown on the right hand side and marked with “?”.
8A074X06 Rev. Preliminary Page 13 of 15
21/08/2003