R.V.R. Elettronica HC3, Manual

Page: 29 / 64

HC3 - Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 29
adeguate power to the system considered (see as reference SETUP 5).
2) Connect one of three amplifiers to Output of the HC3 with an external
wattmeter in series.
3) Switch ON the system with the exciter at the minimum power.
4) Switch the meter selector over the RFL.PWR. position.
5) Increase the output power of the amplifier until 10% of the nominal
value verifing the correct value on the external wattmeter.
6) Adjust R13 trimmer on the Alarms card to obtain the same value on
the analog meter of the HC3.
NOTE: If with exciter at minimum power, the output power of the amplifier is
greater than 10% necessary, insert an attenuator between the ecxiter output
and the input of the amplifier.
5.8 ANTENNA S.W.R. THRESHOLD CALIBRATION
To realize this callibration execute the following operations:
1) Connect to input 1,2 and input 3 of the HC3, three dummy loads with
adeguate power to the system considered (see as reference SETUP 4).
2) Connect one of three amplifiers to Output of the HC3 with an external
wattmeter in series.
3) Switch ON the system with the exciter at the minimum power.
4) Switch the meter selector over the RFL.PWR. position.
5) Increase the output power of the amplifier until 10% of the nominal
value verifing the correct value on the external wattmeter.
6) Adjust R13 trimmer on the Alarms card to obtain the same value on
SETUP 4