R.V.R. Elettronica HC3, Manual

Page: 30 / 64

HC3 - Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 30
the analog meter of HC3.
7) Adjust R56 trimmer on the Alarms card until the ANT. SWR led light
ON.
8) Reduce the output power and check that the ANT. SWR. led light off.
5.9 FOLD-BACK ADJUSTEMENT FOR THE EXCITER
1) The system must be connected in standard configuration and ready
to work.
2) Switch on the system and adjust it for maximum power.
3) Switch off one of three amplifiers.
4) Switch on again the same amplifier; this could remain blocked
because the protection is active and couldn't be able to supply the
output power.
5) Adjust trimmer "UNBAL F. BACK ADJ" placed on the rear panel of HC3
to obtain an output power reduction when the system is unbalanced;
this operation must allow the restart of the blocked amplifier.
6) Repeat point 3, 4, 5, switching off alternatively all ampliers; the
trimmer setting must always allow the restart of any amplifier.