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Date: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ12000-TR - R.F. Tube Amplifier
59
CHAPTER 6
ADJUSTMENTS
NOTE: THESE OPERATIONS MUST BE EXECUTED BY VERY QUALIFIED TECHNICIANS
AND EQUIPPED WITH NECESSARY INSTRUMENTS. UNCORRECTED OPERATIONS CAN
CUASE A SERIOUS DAMAGE OF THE EQUIPMENT AND CAUSE AUTOMATICALLY THE
RESOLVING OF THE WARRANTY.
6.1
FREQUENCY CHANGE
To execute a frequency change on a tube amplifier, it’s necessary to execute the following
operations:
1)
Connect, at first time, only the exciter (30 W max, example PTX30-UHT) to the input of the
VJ12000 amplifier, excluding eventual drivers.
2)
Adjust the power control of the exciter for minimum output power.
3)
Switch on the amplifier and preset the command OUPUT TUNE in function of the working
frequency.
4)
After the heating time and obtained the exciter locking on the working frequency, increase
the output power of the exciter until 20 W.
5)
Enable and act on INPUT LOAD and INPUT TUNE commands to reset the input reflected
power.
6)
The last operation will be able to cause an increasing of the anode current; now, act on
OUPUT TUNE and OUPUT LOAD commands to obtain the maximum output power
readable on the wattmeter. Place the DIR/REF selector on DIR position. Verify that the
threshold bar move to internal position of RF cavity each time that we are near to the 108
MHz frequency and to external position respect the cavity when we are near to 87.5 MHz
frequency.
7)
Increase the input power and adjust the OUPUT TUNE and OUPUT LOAD commands to
obtain again the maximum output power.
8)
Replace at the minimum value the output power of the exciter and switch off it.
9)
Insert the driver between the exciter and amplifier.
10)
Switch on both the exciter and the driver.
11)
Increase the output power of the exciter and execute again a fine OUPUT LOAD and
OUPUT TUNE adjustment and INPUT LOAD and INPUT TUNE adjustment until to obtain
12 KW of output power.
12)
When the 12KW is obtained, execute small adjustment with the same procedure until to
obtain the same output power with the minimum value of the plate absorption, eventually
decrease the exciter power.
APPENDIX A
CIRCUIT DIAGRAMS AND LAYOUTS
Содержание VJ12000-TR
Страница 34: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 34 FIG 16 TUBE INSTALLATION DIAGRAM N 1 ...
Страница 45: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 45 FIG 24 MEASURES CARD REFERENCE VIEW ...
Страница 55: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 55 FIG 28 REPORT MEASURE ...
Страница 62: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 62 FIG 31 RACK POWER SUPPLY BASE ...
Страница 63: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 63 FIG 32 HIGH TENSION PANEL ...
Страница 65: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 65 ...
Страница 66: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 66 ...
Страница 69: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 69 FIG 36 HIGH POWER RELAYS CARD ...
Страница 70: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 70 FIG 37 TUNING RELAYS CARD ...
Страница 71: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 71 FIG 38 TELEMETRY INTERFACE CARD ...
Страница 72: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 72 FIG 39 MEASURES CALIBRATION CARD ...
Страница 73: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 73 FIG 40 THERMAL STROBE CONNECTOR ...
Страница 74: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 74 FIG 41 P W R MEASURE CONNECTOR ...
Страница 76: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 76 FIG 43 PTXLCD CONNECTOR ...
Страница 77: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 77 FIG 44 LOW VOLTAGE CIRCUIT DIAGRAM ...
Страница 78: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 78 FIG 45 THREE PHASES CIRCUIT DIAGRAM ...
Страница 80: ...Date 25 07 03 R V R Elettronica S r l BO VJ12000 TR R F Tube Amplifier 80 FIG 47 ELECTRIC SCHEMES ...