HC5-10
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User Manual
Rev. 1.0 - 26/03/04
9.1.8
LEDs Card
On this card are present four signalling LED that indicates the general state of
machine’s operation.
Is present also a trimmer for the power regulation (A.G.C.), use a small screwdriver in
order to modify the distributed power.
9.2
Phase Regulation between the several Amplifiers
The hybrid coupler is factory-adjusted so that the transmitter it is included in will work
satisfyingly works over the whole FM band.
Cases may happen, that it is necessary to perform the RF adjustment of the HC5-10,
for example if the RF interconnection cables with the amplifiers have been sustituted
with other of slightly different characteristics or length, or if it is desirable to optimize
the transmitter’s performances on a certain frequency.
Warning: we suggest not to perform the operations described in this chapter
to personnel lacking proper instrumentation and deep knowledge of the
device and its working principles.
9.2.1
Capacitors on the splitter circuit
1)
Identificare i trimmer capacitivi nel pannello frontale del HC5-10. Identify the
capacitive trimmer in the frontal panel of the HC5-10.
2)
Regulate all the variable capacitor in a middle position in this way :
•
Turn all the compensators in clockwise sense until to the end.
•
Turn all the compensators in counterclockwise sense for 3 turn completely.
3)
Switch on the transmitter, with the exciter set up on the operating frequency and
to regime power.
4)
On the coupler, set up the display on the reading of
Rej.Pwr
.
6)
Regulate the variable capacitors (1) and (2), related to the first amplifier so as
to diminish
Rej.Pwr
measured from the coupler.
