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PJ250-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)
Pag. 33
B) CALIBRATION OF V.S.W.R.
1)
Connect a dummy load, 25 Ohm 500W (or two dummy loads 50 Ohm 250W
in parallel) with a by-pass wattmeter in series (e.g. BIRD mod.43)
set for reflected power reading (SETUP 4).
2)
Adjust the output power of the exciter to obtain a reading of 25W
of reflected power on the external wattmeter and the PJ250-NV’s
meter.
3)
Adjust the trimmer, R7, placed on the Alarms card until the S.W.R.
protection is activated, and the S.W.R. ANT. led lights up.
4)
Decrease the output power of the exciter and wait for the S.W.R.
led to go out (automatic protection cycle).
5)
Increase the output power of the exciter again over the S.W.R.
threshold of 25W, and verify, once again, that the S.W.R. ANT. led
lights up.
C) CALIBRATION OF OVER-DRIVE ALARM THRESHOLD
1)
Adjust the driver power to minimum and switch on the amplifier.
2)
Connect a non inductive dummy load 50 Ohm P>250W to the R.F. output
with a through wattmeter (e.g. BIRD mod.43) in series as shown in
the SETUP 5.
3)
Place the FWD/RFL PWR selector (7 Fig.1) to the RFL position.
SETUP 4
SETUP 5
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...