SRK Electronics MFTX100, Operation And Service Manual, Page: 62 / 100

MFTX AM TRANSMITTERS
SRK Electronics 62
13. Adjustments
The MFTX range are of advanced design with very few adjustments. Below is a
summary of these adjustments. These are factory set and will not normally need
to be adjusted in the field.
However, this information is included here to aid servicing.
13.1 POT1, Forward power calibration
This pot is adjusted so that the measured forward output RF power reads
correctly.
13.2 POT2, Reflected power threshold
This pot is used to set the reflected power level at which the transmitter’s high
SWR protection is tripped. Normally set to 10% of the transmitter’s rated output.
13.3 POT3, Reflected power calibration
This pot is adjusted so that the measured forward output RF power reads
correctly.
13.4 POT4, carrier frequency fine adjustment
Allows the free running carrier frequency to fine tuned over a range of a few
PPM. This pot has no effect when the external 10MHz reference is selected.
13.5 POT5, LCD contrast
Allows the contrast of the LCD on the front panel to be adjusted.
13.6 POT6, alarm tally analogue voltage trim
This pot allows the analogue voltage of the alarm tally on the analogue remote
control interface to be adjusted to exactly 1.00V per alarm.