The output relay
was a different story. The stock output relay of the 2KL is mounted
the Filter Unit. The Kilovac HC1 was purchased from Allen
Bond, President of Max-Gain Systems Inc. It did not fit into
the narrow gap between the wall of the Filter Unit and the row of band
relays. Way to go is to put that relay outside of the filter unit. The
output relay is mounted on a small aluminium bracket, suspended by
rubber strips. The 500 watt RF from the finals is fed to the
with a short section of RG58 coax.
The output is wired straight to the output connector at the backpanel of the amplifier. Leave the connection to Filter Unit as it is, since that is needed for the SWR measurement circuit of the amplifier. The bypass coax is connected to the terminals of the relay.
For the control
circuit of the output relay, a small piece of epoxy copper clad
is used, The copper surface was divided in sections with the help of a
small saw. On these sections the resistors, diode and high
switching transistor was placed. The small board was placed adjacent to
the output relay. The board consist of the series resistor, the
resistor and diode and the switching transistor. The relay is powered
the 43 V collector voltage, the series resistor (200 ohm) limits the
through the relay coil (77 mA) and the parallel resistor (510 ohm)
fast coil flux discharge in order to minimize the T-R cycle time.
Relay and control board are bolted to the Filter Unit cover, adjacent
the Main Unit. The T13 and 43 V HV are taken from the Main Unit board.