User's Manual

P. G. TM0060
4-2
4.2 ATTENUATION (AP)
The amplifier has a nominal overall gain of 20 dB in the PCS frequency band, but this
gain may be reduced by a built-in attenuator. The attenuator is installed on the uplink
side of the amplifier and hence does not have significant impact on the uplink system
noise figure.
The attenuator is set for values from 0 to 15 dB by four jumpers in a binary sequence.
Setting the jumpers to the “IN” position inserts, 1, 2, 4 or 8 dB attenuation in the circuit.
Refer to the label attached to the inside of the cover for an enlarged view of these
jumpers and their setting positions.
NOTE: The jumpers must be set to either the IN or OUT positions for correct attenuator
operation. Do not leave open. If the optional AUTOSET control board is fitted,
see Appendix A for further information.
4.3. FAULT OPTIONS (F)
The block of jumpers for the fault options allows disabling of tests by removing the
appropriate jumper.
The jumper to monitor downlink RF power is labelled PRF.
The jumper to disable amplifier bias current monitoring is labelled PB.