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VJ2000
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USER MANUAL
Rev. 4.0 - 26/02/01
5. Electrical Description
5.1 Introduction
This section describes in detail, the operation of the VJ2000.
For ease of description, the unit has been divided into sections, each of which is described in
detail, below.
5.2 Power Supply
The power supply, accessible via the rear panel, has been designed to be both rugged
and at the same time simple to maintain, allowing easy access to every component thus
easing repair work.
The power supply features a PI filter after the rectifying stage which attenuates spurious
components.
Two fuses provide overload protection.
The power supply comprises three separate transformers: the largest supplies the tube anode,
a toroidal transformer supplies the tube's filament (this is found towards the rear of the RF
chamber) and lastly an auxiliary supplies various functions such as relays and the protection
system.
This power supply is designed to work at single phase voltages (three phase is available on
request).
5.3 Protection Card
This card is mounted in a metal box and fixed to the right-hand side of the RF chambers
chassis (5 Photo 2). This sub-unit has three alarm inputs which carry the signal to a comparator
which compares them to a pre-defined threshold. Should one of these inputs exceed the
alarm threshold, the amplifier is disactivated and a counter is started.
If the fault condition does not dissappear within the period defined by the counter, the unit is
shut down indefinately.
5.4 Tube
The ceramic/metal power triode 3CX800A7 has been designed to work in AB
2
class
amplifiers, in class B cathode-driven amplifiers, in audio or RF applications including the
VHF band, or in class C cathode-driven, anode-modulated RF amplifiers.
As linear amplifiers, they feature high power gain with low levels of intermodulation.
For the tube specification, see Table C.
Summary of Contents for VJ2000
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Page 21: ...VJ2000 15 44 USER MANUAL Rev 4 0 26 02 01 FIG 1...
Page 23: ...VJ2000 17 44 USER MANUAL Rev 4 0 26 02 01 FIG 2...
Page 25: ...VJ2000 19 44 USER MANUAL Rev 4 0 26 02 01 FOTO 1 3 1 2 5 7 11 9 4 6 8 12 10...
Page 27: ...VJ2000 21 44 USER MANUAL Rev 4 0 26 02 01 FOTO 2 1 2 3 6 5 4...
Page 29: ...VJ2000 23 44 USER MANUAL Rev 4 0 26 02 01 FOTO 3 10 11 8 3 9 1 2 7 6 5 4...
Page 43: ...VJ2000 37 44 USER MANUAL Rev 4 0 26 02 01 SETUP 3 FIG 3...
Page 44: ...VJ2000 38 44 USER MANUAL Rev 4 0 26 02 01 SETUP 4 FIG 4...
Page 45: ...VJ2000 39 44 USER MANUAL Rev 4 0 26 02 01 SETUP 5 FIG 5...
Page 46: ...VJ2000 40 44 USER MANUAL Rev 4 0 26 02 01 SETUP 6 FIG 6...
Page 51: ...VJ2000 Flat Cable 1 2 Appendice Tecnica Rev 1 0 26 02 01...
Page 53: ...VJ2000 Telemetry Cable 1 2 Appendice Tecnica Rev 1 1 26 02 01...
Page 55: ...VJ2000 Power Supply 1 ph 1 6 Appendice Tecnica Rev 1 0 26 02 01...
Page 56: ...VJ2000 2 6 Power Supply 1 ph Technical Appendix Rev 1 0 26 02 01...
Page 61: ...VJ2000 H T R Card 1 phase 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Page 62: ...VJ2000 2 4 H T R Card 1 phase Technical Appendix Rev 1 0 26 02 01...
Page 65: ...VJ2000 R F Block 1 ph 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Page 69: ...VJ2000 Power Supply 3 ph 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Page 70: ...VJ2000 2 4 Power Supply 3 ph Technical Appendix Rev 1 0 26 02 01...
Page 73: ...VJ2000 H T R Card 3 phase 1 2 Appendice Tecnica Rev 1 0 26 02 01...
Page 75: ...VJ2000 R F Block 3 ph 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Page 80: ...VJ2000 2 4 Alarms Card Technical Appendix Rev 1 0 26 02 01...
Page 84: ...VJ2000 2 4 Gride Plate Meter Technical Appendix Rev 1 0 26 02 01...
Page 88: ...VJ2000 2 4 H V M Voltmeter Technical Appendix Rev 1 0 26 02 01...
Page 92: ...VJ2000 2 4 Plate V M Card Technical Appendix Rev 1 0 26 02 01...
Page 96: ...VJ2000 2 4 Low Pass Filter Technical Appendix Rev 1 0 26 02 01...
Page 99: ...VJ2000 Input Matching Circuit 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Page 100: ...VJ2000 2 4 Input Matching Circuit Technical Appendix Rev 1 0 26 02 01...
Page 104: ...VJ2000 2 4 Directional Coupler Technical Appendix Rev 1 0 26 02 01...
Page 107: ...VJ2000 Telemetry Card opt 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Page 108: ...VJ2000 2 4 Telemetry Card opt Technical Appendix Rev 1 0 26 02 01...