Table of Contents
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POWER SUPPLY
Power supply of the amplifier is effected by one 2.5 kVA toroidal transformer. A soft start is
realized with the help of relays and resistors.
The high anode voltage consists of 8 times 350 V and 1,5 A. Each of them has its own rectifier and
filter. In the high voltage circuit safety resistors are employed to protect the amplifier against overload.
The source for screen grid is stabilized by a parallel stabilizer with BU508 transistors and delivers a
voltage of 360V at 100mA.
The -120V for the control grid is stabilized by means of zener diodes.
SAFETY DEVICES
Control and monitoring circuits ensure control and safety of the circuits of the device during
malfunction of the PA. They are placed on the Control board, which is located on the subpanel.
Putting the power amplifier into operation
Coaxial cable
The output of the transceiver is to be connected with the input of the amplifier via RG58 or similar
cable. For the connection between the power amplifier and the antenna RG213 or similar coaxial
cable suited for this high power is to be used. For INPUT and OUTPUT PL-259-sockets with Teflon
isolation are used.
Mains plug 230 V
Fuses
OUTPUT
KEY OUT
KEY IN
INPUT
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