the receiver’s front-end circuitry, again causing non-
compliance of the spectral occupancy.
NOTE: If changing the transmission frequency, upon installation, or at
any time in the future, check the deviation levels using a calibrated
deviation test receiver. If the level is too high or low, adjust it using the
following procedure:
Disconnect power to the transmitter. Connect a suitable rated test
load to the RF OUPUT socket before re-connecting the unit to mains
power. IMPORTANT! FAILURE TO DO SO MAY RESULT IN DAMAGE NOT
COVERED BY WARRANTY.
Power-up the unit and reduce the output power (using the rear panel
RF OUTPUT POWER ADJUST control) to the lowest level. Disconnect the
power; there are high voltages and high RF levels inside the transmitter
when AC supply is applied. Remove the lid, and locate the multi-turn
trimmer adjustment control labelled ‘DEV’ on the PCB. This can be
found on the main (central) PCB. Using a suitable tool, carefully turn
the control clockwise (for more deviation) or ant-clockwise (for less
deviation).
Once all settings are correct, power down the unit. Disconnect the test
load and connect to the antenna. Power up the unit and increase the
RF Power (using the rear panel RF ADJ control) to the desired level, not
exceeding 50W.
The FMTX50RBRX is designed for continuous reliable transmission,
however the fans must be periodically checked for correct operation
and free airflow.
The front panel display shows the transmission frequency, forward
power level (
FWD
), reflected power level (
REF
), the receiver (RX)
frequency, and the received signal strength level in dBu.
Operation
