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PJ250-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)
Pag. 31
CHAPTER 5
INTERNAL ADJUSTMENTS
5.1 POWER SUPPLY ADJUSTMENT
No adjustments are needed after this board has been changed.
5.2 R.F. SECTION ADJUSTMENT
No adjustment is required inside the R.F. section because it’s a
factory adjusted module; if calibration is necessary, please send the
module to your local distributor.
5.3 LOW-PASS FILTER ADJUSTMENT
No adjustment is required inside the Low-Pass Filter module because
it’s a factory adjusted module; if calibration is necessary, please send
the module to your local distributor.
5.4 DIRECTIONAL COUPLER BALANCING (PWR MEASURE)
1)
Connect a non inductive dummy load 50 Ohm P>250W to R.F. output with
a through wattmeter in series as shown in SETUP 2.
2)
Place the FWD/RFL PWR selector (6 Fig.1) to the RFL position.
3)
Set the exciter power to obtain 250W on the through external
wattmeter.
4)
Now, adjust variable capacitor C2 placed on the directional coupler
to obtain the minimum value on the meter, very near to zero.
5.5 FORWARD AND REFLECTED POWER ADJUSTMENT
1)
Perform SETUP 2, and increase the amplifier’s output power to 250W
(on the external wattmeter).
SETUP 2
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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...
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