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PJ250-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)
Pag. 14
CHAPTER 2
ELECTRICAL DESCRIPTION
This section describes the overall working theory of PJ250-NV.
For ease of description the amplifier is subdivided into subassemblies
that will be discussed in detail below.
The block diagram is illustrated in Fig.3.
2.1 POWER SUPPLY
The power supply comprises two switching power supply (2-3 Photo
2) fitted to the cooling fins and its accessibles from the lower part
of the amplifier.
A mains transformer (2 Photo 1 and 1 Photo 1) has a selectable input for
voltages between 110 and 240 Volt and two outputs: A 31 Volt, B 18 Volt.
The output "A" drives the two switching units that generate the 28 Volt
needed by the R.F. modules.
Output "B" supplies the ALARMS CARD; inside this circuit a rectifying
and stabilization circuit provides the +15 Volt needed by the
electronics.
2.2 ALARMS CARD
This module (1 Photo 1) is composed of a board shielded by a metal
box mounted on the left side near the rear panel.
On this board, the electronics detect any system anomaly such as excessive
SWR, internal or antenna, over-temperature or over-drive.
This module will also, whenever possible, reset the system to its original
conditions, after a fault has occurred.
2.3 R.F. POWER AMPLIFIER
The module (3 Photo 1) is placed in the upper right side of the
amplifier. This module is totally shielded and placed on a heat sink.
This circuit delivers 300W with 25-30W of drive and is supplied by a
dedicated power supply.
The quiescent parameters of each module are:
V
DC
=28V
I
a
=15A
P
out
=250 W
The active devices employed are BJT NPN (MRF317 or SD1480).
2.4 LOW PASS FILTER
This filter (4 Photo 1) is fitted in a metallic box mounted on the
heat sink on the right position.
Содержание PJ250-NV
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Страница 95: ...PJ250 i Appendix Rev 0 1 03 09 02 APPENDIX Description RVR Code Vers Page Power Supply PSSW2812B 0 1 4...
Страница 96: ...PJ250 ii Appendix Rev 0 1 03 09 02 Pagina lasciata intenzionalmente in bianco...
Страница 97: ...PJ250 PSSW2812B 1 4 Technical Appendix Rev 0 1 03 09 02...