R.V.R. Elettronica PTRL-NV/S3, Technical Manual

Page: 40 / 171

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 38
PTRLNV/S3 - Technical and Maintenance Manual
supply has been replaced.
5.3 CALIBRATION OF THE MODMETER CARD
For this procedure please refer to SETUP 2 (Fig. 5).
SETUP 2 / Fig.5
1) Connect a 50 Ohm dummy load to the R.F. output of the exciter.
2) Connect an audio frequency generator to the MONO or STEREO inputs
set at a frequency of 400 Hz and an amplitude (at the connector)
of -10 dBm (0 dBm for the american version).
3) Connect the R.F. input of the FM modulation meter to the output of
the wattmeter connected to the output of the PTRL-NV/S3.
4) Set the switch (5 Fig.1) to 100% and adjust the AF ADJ controls
(6 Fig.1) in a clockwise direction for maximum power.
5) Adjust trimmer R30 on the Modmeter card until the 1st red led comes
on (corresponding to the 100% level).
6) Set the switch (4 Fig.1) to 10%.
7) Inject a 400 Hz signal into the input connector at a level of
-30 dBm for european versions or -20dBm for american versions.
8) Adjust trimmer R4 on the Modmeter card until the 1st red led comes
on (corresponding to a level of 10%).
5.4 CALIBRATION OF THE MAIN CARD
Having fitted the Main card and made all necessary connections,
carry out the following procedure (see SETUP 2 / Fig.5):