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PJ250-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)
Pag. 32
2)
Place the FWD/RFL PWR selector (6 Fig.1) to the FWD position.
3)
Adjust trimmer R9 placed on the directional coupler for the same
reading on the PJ250-NV’s meter is obtained.
4)
Switch off the amplifier.
5)
Connect a dummy load 25 Ohm 500W (or 2 dummy load 50 Ohm 250W in
parallel) with a through wattmeter (e.g. BIRD mod.43) in series,
set for the reading of reflected power (SETUP 3).
6)
Adjust the drive power to minimum and switch on the amplifier again.
7)
Adjust the output power of the exciter to obtain a reading of 25W
of reflected power on the external wattmeter.
8)
Adjust trimmer R6 placed on the directional coupler to obtain the
same reading on the PJ250-NV’s meter.
5.6 ALARMS CARD ADJUSTMENT
There are three trimmers on the Alarms card that are necessary to
adjust the alarm thresholds: over-temperature (R4), V.S.W.R. (R7) and
overdrive (R21).
A) CALIBRATION OF OVER-TEMPERATURE ALARM THRESHOLD
1)
Short-circuit the thermal switch placed on the RF section’s heat
sink.
2)
Adjust the trimmer, R4, placed on the Alarms card until the over-
temperature protection is activated, and the TEMP. led lights up.
3)
Remove the short-circuit on the thermal switch and verify that the
TEMP. led goes out.
4)
Repeat this procedure again to verify the correct trimmer R4
adjustment.
SETUP 3
Summary of Contents for PJ250-NV
Page 17: ...PJ250 NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 17 F I G 1...
Page 19: ...PJ250 NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 19 F I G 2...
Page 23: ...PJ250 NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 23 P H O T O 2 1 3 2...
Page 24: ...PJ250 NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 24 F I G 3...
Page 49: ...PJ250 NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 49 F I G 1...
Page 51: ...PJ250 NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 51 F I G 2...
Page 53: ...PJ250 NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 53 FOTO 1 5 4 3 1 2...
Page 55: ...PJ250 NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 55 FOTO 2 1 3 2...
Page 56: ...PJ250 NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 56 F I G 3...
Page 68: ...PJ250 NV Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 68 WIRING DIAGRAM...
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Page 96: ...PJ250 ii Appendix Rev 0 1 03 09 02 Pagina lasciata intenzionalmente in bianco...
Page 97: ...PJ250 PSSW2812B 1 4 Technical Appendix Rev 0 1 03 09 02...