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The Power supply of the amplifier is made up of two 2.0 kVA toroidal transformers. A
soft start process is initialized by resistors and relays circuits contained on the
soft-start power supply board.
The high anode voltage consists of 8 times 420V (3300V) at 2Amps. Each of these contain
there own rectifier and filter. In the high voltage circuit safety resistors are installed 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 using 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 RG58or
better.The connection between the power amplifier and the antenna should becoaxial cable
such as RG213, LMR400or better must be used. For INPUT and OUTPUT PL-259-sockets
with Teflon isolation are used.
Rear view of the amplifier
MAIN SUPPLY
The amplifier is connected to230/240vac mains with 2 cables. Each cable needs to be
connected to either another phase or to a single phase that will supply 2KW each. If
connected to a single phase, ensure your mains supplyis able to deliver 4KW. Failure to do
this will result in limited RF output and could cause issues with RFI.
HF2013DX-A HF AMPLIFER INSTRUCTION MANUAL
Page 12 of 37
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