User Manual

APPENDIX C: Gain Adjustment
The standard factory active gain setting for the Propagator is 50dB. Some installation
locations provide a very low multi-path feedback environment and can support a stable active
gain of 60dB. Factory trained service personnel can easily set the gain of the Propagator to
either gain setting using the following procedure:
1) Remove the white plastic radome on the mobile side of the Propagator. This is
accomplished by using a dull pocket knife to first remove the plastic staking pins in
the plastic rivets around the edge of the radome (see Figure C-1). After the staking
pins are removed, the plastic expansion sleeves are easily extracted using the same
dull pocket knife (see Figure C-2).
2) Remove the 4 nylon screws attaching the mobile side antenna circuit board to the
nylon stand-offs on the electronics housing (see Figure C-3).
3) Carefully remove (unplug) the antenna circuit board using the large holes thru the
circuit board adjacent to the RF connector on the bottom side of the circuit board. It
may be necessary to rock the circuit board around after the RF connection is
unplugged to get the circuit board past the 4 plastic LED lenses.
4) The gain setting jumpers are accessible thru two slot openings in the electronics
housing cover (see Figure C-4). The jumpers should be covering both circuit pins for
50dB active gain (see Figure C-5). The jumpers should only be covering one pin for
60dB active gain (see Figure C-6). Set the jumpers for the desired gain in each
channel; the downlink gain set jumper is nearest the mounting base of the Propagator
(see Figure C-7).
5) Reverse steps 1-3 above to re-install the antenna circuit board and the radome.
DO NOT DISTURB THE BRASS DIPLEXER TUNING SCREWS !!!