User's Manual

P.G. TM0032FE
4 - 2
4.2 ATTENUATION (AC AND AP)
The A211 has a nominal overall gain of 20 dB in both the cellular and PCS frequency
bands, but this gain may be reduced by built-in attenuators included in each frequency
band. The attenuators are installed on the uplink side of the amplifier and hence do not
have significant impact on the uplink system noise figure.
The attenuator for each band is set for values from 0 to 15 dB by four jumpers switches
in a binary sequence. Setting the jumpers to the “IN” position inserts, 1, 2, 4 or 8 dB
attenuation in the circuit for that band. 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 four jumpers for the fault options allows disabling of each of four tests by
removing the appropriate jumper.
The jumpers to monitor downlink RF power are labelled CRF for the cellular band and
PRF for the PCS band.
The jumpers to disable amplifier bias current monitoring are labelled CB for the cellular
amplifier and PB for the PCS amplifier.