POWER SUPPLY
Power supply of the amplifier is effected by two 2,0 kVA toroidal transformers. A soft start is
realized with the help of relays and resistors.
The high anode voltage consists of 8 times 420V 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 parallel stabilization 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
REMOTE
I / O Interface INPUT
Rear view of the amplifier
Summary of Contents for OM2500 A
Page 1: ...Instruction Manual OM2500 A SHORTWAVE POWER AMPLIFIER OM POWER s r o 930 30 B 126 SLOVAKIA...
Page 12: ...Example of AUTO mode using ICOM TRX Example of AUTO mode using Kenwood TRX...
Page 15: ...Example of connection for Icom...
Page 16: ...Example of connection for ELECRAFT...
Page 17: ...Example of connection with Yeasu...
Page 19: ...Example of connection with antenna switch and BPF...
Page 24: ...Example of connection PA with Microham MKII MK2R etc with CI V output...
