The deviation level is changed internally, as follows…
ELECTRIC SHOCK AND RF BURN HAZARD! DISCONNECT THE
POWER BEFORE REMOVING ANY COVERS.
To adjust the deviation level, locate the trimmer adjustment
potentiometer “DEV” on the internal main circuit board and use
a suitable tool to carefully adjust the multi-turn control. This is
the overall level input to the modulator.
The factory will have set the deviation, RDS and pilot injection levels.
They should need no further adjustment. However, if absolutely
necessary, these can be changed as follows (NOT recommended):
ELECTRIC SHOCK AND RF BURN HAZARD! DISCONNECT THE
POWER BEFORE REMOVING ANY COVERS.
To adjust the RDS injection level, locate the trimmer adjustment
potentiometer “RDS” on the internal main circuit board and use
a suitable tool to carefully adjust the multi-turn control.
To adjust the 19kHz Pilot injection level, locate the trimmer
adjustment potentiometer “DEV” on the internal main circuit
board and use a suitable tool to carefully adjust the multi-turn
control.
Take GREAT CARE not to adjust any other circuit trimmer
controls. Even the slightest adjustment WILL degrade
performance and may cause non-compliance with 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 the antenna. Power up the unit and repeat the
power setting procedure above, to set the RF power output to the
required level.
Set-up is now complete and the transmitter can be used for
broadcasting.
