VJ1000HP
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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 VJ1000HP.
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 two separate transformers: the largest supplies the tube anode,
the other transformer supplies the tube's filament and supplies various functions such as
relays and the protection system.
This power supply is designed to work at single phase voltages.
5.3
Protection Card
This card is mounted in a metal box and fixed to the right-hand side of the RF chamber’s
chassis (6 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 3CX1500A7/8877 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.
Содержание VJ1000HP
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Страница 47: ...VJ1000HP Flat Cable 1 2 Appendice Tecnica Rev 1 0 26 02 01...
Страница 49: ...VJ1000HP Telemetry Cable 1 2 Appendice Tecnica Rev 1 1 26 02 01...
Страница 51: ...VJ1000HP Power Supply 1 4 Appendice Tecnica Rev 1 0 25 05 02...
Страница 52: ...VJ1000HP 2 4 Power Supply Technical Appendix Rev 1 1 20 05 02...
Страница 55: ...VJ1000HP H T Rectifier Board 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Страница 56: ...VJ1000HP 2 4 H T Rectifier Board Technical Appendix Rev 1 0 26 02 01...
Страница 59: ...VJ1000HP R F Block 1 ph 1 4 Appendice Tecnica Rev 1 0 26 02 01...
Страница 68: ...VJ1000HP 2 4 Grid Plate Meter B Technical Appendix Rev 1 0 26 02 01...
Страница 71: ...VJ1000HP Low Pass Filter 1 4 Appendice Tecnica Rev 1 0 26 02 01 C1 L1 C2 L2 C3 L3 C4 C5 L4 PHOTO 5 FOTO 5...
Страница 72: ...VJ1000HP 2 4 Low Pass Filter Technical Appendix Rev 1 0 26 02 01...
Страница 75: ...VJ1000HP Input Matching Circuit 1 4 Appendice Tecnica Rev 1 0 26 02 01...
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Страница 80: ...VJ1000HP 2 4 Directional Coupler Technical Appendix Rev 1 0 26 02 01...
Страница 83: ...VJ1000HP Telemetry Card opt 1 4 Appendice Tecnica Rev 1 0 26 02 01...