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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
Содержание PJ250-NV
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Страница 95: ...PJ250 i Appendix Rev 0 1 03 09 02 APPENDIX Description RVR Code Vers Page Power Supply PSSW2812B 0 1 4...
Страница 96: ...PJ250 ii Appendix Rev 0 1 03 09 02 Pagina lasciata intenzionalmente in bianco...
Страница 97: ...PJ250 PSSW2812B 1 4 Technical Appendix Rev 0 1 03 09 02...