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PTX-LCD
13 / 58
User Manual
Rev. 2.3 - 18/07/07
is possible to have constant overall output power even if the amplifiers gain is not
constant over the FM range, and to limit the reflected power of the amplifierso that
the its protection system doesnt intervene.
To adjust the EXT AGC trimmers of the PTX-LCD, procced as described in the
following.
Perform the connections described in figure 5-3. The connection cable can be
supplied on request by R.V.R. Elettronica or be realized by a technician you trust,
depending on the pinout of the amplifier you use.
RF Out
RF In
RF Out
Remote
Telemetry
PTX-LCD
RF Amplifier
Figure 5-3
Switch on the exciter at minimum power.
Turn both trimmers completely clockwise.
Rise the power emitted by the exciter until on the instrument of the amplifier you
read an emitter power level just above the desired threshold.
Turn the EXT AGC - FWD trimmer counter-clockwise until you see the power
emitted by the amplifier starting to decrease.
Decrease the power emitted by the exciter to the minimum.
Disconnect the dummy load from the amplifier and substitute it with an unadapted
load, so that part of the emitted power is reflected, and set the amplifiers instrument
to measure the reflected power.
Rise the power emitted by the exciter until on the instrument of the amplifier you
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