VJ1000
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USER MANUAL
Rev. 3.0 - 26/02/01
8. Calibration Procedure
N.B. THE FOLLOWING PROCEDURE SHOULD ONLY BE CARRIED OUT BY QUALIFIED
PERSONNEL USING THE CORRECT TOOLS AND EQUIPMENT. UNQUALIFIED OR
INEXPERIENCED PERSONNEL NOT USING THE CORRECT TOOLS AND
EQUIPMENT CAN EASILY CAUSE DAMAGE TO THE UNIT WHICH WILL
IMMEDIATELY INVALIDATE THE GUARANTEE.
8.1
Frequency Changes
To change the operating frequency of a tube amplifier the following procedure is required:
1)
Select the desired frequency on the exciter.
2)
Reduce exciter power to minimum power.
3)
Connect the line supply (220V ±5%) to the unit.
4)
Switch the POWER switch to ON, the corresponding indicator will show the presence of
the line supply in the unit and, at the same time the cooling fan will start.
Normally the PRESS. indicator will stay on for a few seconds before the fan has created
sufficient air flow.
After 2/3 minutes of warming up, the HT indicator will light up; simultaneously the
characteristic noise of the power solenoid will be heard indicating that the anode supply
is active.
The driver will also be active. The unit without excitation will absorb about 30 mA of
anode current.
5)
Switch the OUTPUT POWER switch to DIR and the CURRENTS switch to PLATE.
6)
Adjust the exciter power control to obtain an anode current of 150/200mA.
7)
Using the TUNING switch, activate the tuning motors so that both green leds next to the
PLATE control light up.
Holding the TUNING switch down, use the PLATE "+" or "-" control (the unit is factory
set to a frequency of 98 MHz) to tune the plate circuit.
"+" indicates an increase in frequency and "-", a reduction in frequency.
If one of the leds switches off, this indicates that the end of the frequency range has
been reached and that no more adjustment is available in that direction.
The OUTPUT POWER meter can be used to tune the plate circuit; maximum meter
reading (maximum output power) corresponding to correct tuning.
8)
The LOAD tuning procedure follows in a similar fashion: holding down the TUNING
switch, adjust the LOAD control for maximum output power.
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Summary of Contents for VJ1000
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Page 18: ...VJ1000 14 40 USER MANUAL Rev 3 0 26 02 01 FIG 1 www DataSheet4U com ...
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Page 24: ...VJ1000 20 40 USER MANUAL Rev 3 0 26 02 01 PHOTO 2 1 2 3 4 5 6 www DataSheet4U com ...
Page 38: ...VJ1000 34 40 USER MANUAL Rev 3 0 26 02 01 SETUP 1 FIG 3 www DataSheet4U com ...
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Page 47: ...VJ1000 Flat Cable 1 2 Appendice Tecnica Rev 1 0 26 02 01 www DataSheet4U com ...
Page 49: ...VJ1000 Telemetry Cable 1 2 Appendice Tecnica Rev 1 1 26 02 01 www DataSheet4U com ...
Page 51: ...VJ1000 Power Supply 1 4 Appendice Tecnica Rev 1 0 26 02 01 www DataSheet4U com ...
Page 52: ...VJ1000 2 4 Power Supply Technical Appendix Rev 1 0 26 02 01 www DataSheet4U com ...
Page 55: ...VJ1000 H T Rectifier Board 1 4 Appendice Tecnica Rev 1 0 26 02 01 www DataSheet4U com ...
Page 56: ...VJ1000 2 4 H T Rectifier Board Technical Appendix Rev 1 0 26 02 01 www DataSheet4U com ...
Page 59: ...VJ1000 R F Block 1 4 Appendice Tecnica Rev 1 0 26 02 01 www DataSheet4U com ...
Page 68: ...VJ1000 2 4 Grid Plate Meter B Technical Appendix Rev 1 0 26 02 01 www DataSheet4U com ...
Page 72: ...VJ1000 2 4 Low Pass Filter Technical Appendix Rev 1 0 26 02 01 www DataSheet4U com ...
Page 75: ...VJ1000 Input Matching Circuit 1 4 Appendice Tecnica Rev 1 0 26 02 01 www DataSheet4U com ...
Page 76: ...VJ1000 2 4 Input Matching Circuit Technical Appendix Rev 1 0 26 02 01 www DataSheet4U com ...
Page 80: ...VJ1000 2 4 Directional Coupler Technical Appendix Rev 1 0 26 02 01 www DataSheet4U com ...
Page 83: ...VJ1000 Telemetry Card opt 1 4 Appendice Tecnica Rev 1 0 26 02 01 www DataSheet4U com ...
