R.V.R. ELETTRONICA S.r.l. (BO)
Pag. 78
VJ3000 - Technical and Maintenance Manual
SECTION 5
CALIBRATION
THESE PROCEDURES SHOULD ONLY BE CARRIED OUT BY HIGHLY SPECIALIZED
TECHNICIANS USING THE CORRECT EQUIPMENT. MAINTENANCE ERRORS CAN CAUSE
SERIOUS DAMAGE TO THE UNIT AND WILL AUTOMATICALLY MAKE THE WARRANTY VOID.
5.1 CHANGIN FREQUENCY
To change the operating frequency of a tube amplifier, the following
procedure should be carried out (SETUP 4):
1)
Initially, connect only the exciter to the VJ3000 amplifier input,
excluding the driver.
2)
Adjust the exciter output power to minimum.
3)
Connect the supply to the amplifier and pre-position the PLATE
command according to TABLE F (length of threaded bar as a function
of operating frequency).
4)
Wait until the warm-up period has finished the exciter has locked
to its programmed frequency.
Increase the exciter output power to about 20 W.
5)
Enable and adjust controls INPUT and GRID to zero the input reflected
power.
6)
The proceeding operation will cause the anode current to increase,
now adjust the PLATE and LOAD controls (3 and 5 Fig.4) to maximize
the output power displayed on the wattmeter.
The DIR/REF selector should be in the DIR position (7 Fig.3).
Ensure that the threaded bars move towards the inside of the chamber
as the frequency is moved towards 108Mhz and towards the outside of
the chambre when the frequency is moved towards 88Mhz.
7)
Increase input power and re-adjust the PLATE and LOAD controls to
obtain maximum output power.
8)
Adjust the exciter power for minimum and switch it off.
9)
Re-connect the driver between exciter and the final stage.
10) Switch on both exciter and driver.
11) Increase power while adjusting the LOAD and PLATE controls (3 and
5 Fig.4) and also INPUT and GRID (2 and 4 Fig.4) to obtain 3 KW of
output power.
Содержание VJ3000
Страница 1: ...R V R ELETTRONICA S r l BO Pag 51 VJ3000 Technical and Maintenance Manual 1 2 3 4 6 5 FIG 10...
Страница 3: ...R V R ELETTRONICA S r l BO Pag 53 VJ3000 Technical and Maintenance Manual 1 8 7 2 3 4 6 5 FIG 11...
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Страница 7: ...R V R ELETTRONICA S r l BO Pag 57 VJ3000 Technical and Maintenance Manual 1 2 3 7 6 5 4 FIG 12B...
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Страница 20: ...R V R ELETTRONICA S r l BO Pag 70 VJ3000 Technical and Maintenance Manual PROTECTION TRIMMER TABLE TABLE H...
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