POWER SUPPLY
Power supply of the amplifier is effected by two 2,5 kVA toroidal transformers. A soft start is
realized with the help of relays and resistors.
The high anode voltage consists of 8 times 425 V and 2A. 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 paralell stabilizator 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
1
Mains plug
2
Fuses
OUTPUT - 7/16 Connector
KEY OUT KEY IN INPUT- N connector
Rear view of the amplifier
