R.V.R. ELETTRONICA S.r.l. (BO)
Pag. 39
PTRLNV/2/S3 and PTRL-NV/2/HP/S3 - Technical and Maintenance Manual
3)
Remove jumper JP4 from the Main card.
4)
Inject a 400 Hz signal at a level of -10 dBm (0.775 V
RMS
or 2.2 V
PP
peak to peak for american versions) into the MONO input (trimmer
R42 at maximum).
5)
Set the STEREO/MONO-MPX selector (2 Fig.1) to MONO.
6)
For american versions, inject the Mono signal at 0 dBm into the Mono
"+" and Mono "-" of the U.S.A. audio input card. Set the STEREO/
MONO-MPX switch to
MONO
and
adjust
R8 to annul the signal on
pin 14 of U2 (cmrr Common Mode Rejection Ratio).
Now, inject the mono signal at 0 dBm into the Mono "+" only (Mono
"-" is connected to ground).
7)
Connect
an
oscilloscope
to pin 14 of U1 (with R8 in a central
position) and adjust R40 for a reading of 8 V
PP
.
Set the STEREO/MONO-MPX switch (2 Fig.1) to STEREO, insert pilot
tone (5 Fig.1) and make the same adjustment using R37.
8)
Configure the FM modulation meter to measure deviation with 75KHz.
If this is not the case, adjust trimmer R8 on the VCO for the right
value.
9)
Inject a 400 Hz signal at a level of -10 dBm (0.775 V
RMS
or 2.2 V
PP
peak to peak for american versions) into the L and R inputs (trimmer
R41 at maximum).
10)
Set the STEREO/MONO-MPX switch (2 Fig.1) to STEREO, insert pilot
tone (5 Fig.1) and fit jumper J3 to the Main card.
11)
Connect
an
oscilloscope
to pin 14 of U1 (with R8 in a central
position) and adjust R28 for a reading of 8 V
PP
.
12)
Now remove jumper JP3 and fit it to JP4. Adjust R35 for 8 V
PP
.
NOTE: The audio generator used for this test must have a distortion level
of better than 0.001%.
Carry
out
this
procedure
at
the
normal
operating
frequency
of
the
transmitter
5.5 CALIBRATION OF THE ANAMETER CARD
After replacement of the cards it is necessary to calibrate all the
functions that they perform:
1)
Connect a 30dB attenuator between the R.F. Ouput amd Power Meter
(show SETUP1 / Fig.4)
2)
Adjust the output power for 1W for 1W version, 2W for 2W version
or 5W for 5W version.
Summary of Contents for PTRL-NV/2/S3
Page 141: ...PTRL NV 2 S3 PTRL NV 2 HP S3 PSSW PTNV 1 6 Appendice Tecnica Rev 0 1 15 05 02...
Page 148: ...PTRL NV 2 S3 PTRL NV 2 HP S3 2 10 CPU NV Technical Appendix Rev 0 1 12 09 02...
Page 151: ...PTRL NV 2 S3 PTRL NV 2 HP S3 CPU NV 5 10 Appendice Tecnica Rev 0 1 12 09 02...
Page 157: ...PTRL NV 2 S3 PTRL NV 2 HP S3 CSSDC30A003 1 6 Technical Appendix Rev 0 1 06 09 02...
