To adjust the 19kHz Pilot level, remove the unit’s top cover and
locate the “PILOT” preset trimmer control on the internal PCB.
Using a suitable trimmer tool carefully adjust the control.
Take GREAT CARE not to adjust any other circuit trimmer
controls. Even the slightest adjustment WILL degrade
performance and may cause non-compliance to broadcast
regulations.
Connect Left and Right Audio to the rear panel XLR connectors, and
adjust the source level so that maximum audio peaks register just
below the peak section of the front panel audio level bar graph display.
Use ordinary programme material, rather than test tones.
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 1W.
The front panel display shows the, forward power level (
) reflected
power level (
) audio input levels (ahead of any audio processing) and
transmission frequency.
Audio levels will be optimised by the Audio Processor, however regular
checks of audio levels entering the transmitter are advised.
Should the RF output fail due to a PLL error in the modulator circuitry,
“ALARM!” will show in place of the forward power reading.
Try resetting the FMTX1, by switching the power off, waiting 15
seconds and then switching the power back on.
Should the reflected RF power be too high, “ALARM!” will show in place
of the reflected power reading.
Switch off the power, and remedy the fault with the antenna (or
its cabling, connectors, etc) then resume power to the FMTX1.
Operation
Summary of Contents for FMTX1
Page 8: ......