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VJ2000
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USER MANUAL
Rev. 4.0 - 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 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 200 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 350/400mA.
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.
REPEAT STEPS 7 AND 8 SEVERAL TIMES TO OBTAIN THE OPTIMUM SETTINGS
9)
Increase exciter power until an output power of 2000W is obtained and repeat steps 7
and 8.
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Страница 51: ...VJ2000 Flat Cable 1 2 Appendice Tecnica Rev 1 0 26 02 01...
Страница 53: ...VJ2000 Telemetry Cable 1 2 Appendice Tecnica Rev 1 1 26 02 01...
Страница 55: ...VJ2000 Power Supply 1 ph 1 6 Appendice Tecnica Rev 1 0 26 02 01...
Страница 56: ...VJ2000 2 6 Power Supply 1 ph Technical Appendix Rev 1 0 26 02 01...
Страница 61: ...VJ2000 H T R Card 1 phase 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Страница 62: ...VJ2000 2 4 H T R Card 1 phase Technical Appendix Rev 1 0 26 02 01...
Страница 65: ...VJ2000 R F Block 1 ph 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Страница 69: ...VJ2000 Power Supply 3 ph 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Страница 70: ...VJ2000 2 4 Power Supply 3 ph Technical Appendix Rev 1 0 26 02 01...
Страница 73: ...VJ2000 H T R Card 3 phase 1 2 Appendice Tecnica Rev 1 0 26 02 01...
Страница 75: ...VJ2000 R F Block 3 ph 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Страница 80: ...VJ2000 2 4 Alarms Card Technical Appendix Rev 1 0 26 02 01...
Страница 84: ...VJ2000 2 4 Gride Plate Meter Technical Appendix Rev 1 0 26 02 01...
Страница 88: ...VJ2000 2 4 H V M Voltmeter Technical Appendix Rev 1 0 26 02 01...
Страница 92: ...VJ2000 2 4 Plate V M Card Technical Appendix Rev 1 0 26 02 01...
Страница 96: ...VJ2000 2 4 Low Pass Filter Technical Appendix Rev 1 0 26 02 01...
Страница 99: ...VJ2000 Input Matching Circuit 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Страница 100: ...VJ2000 2 4 Input Matching Circuit Technical Appendix Rev 1 0 26 02 01...
Страница 104: ...VJ2000 2 4 Directional Coupler Technical Appendix Rev 1 0 26 02 01...
Страница 107: ...VJ2000 Telemetry Card opt 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Страница 108: ...VJ2000 2 4 Telemetry Card opt Technical Appendix Rev 1 0 26 02 01...