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TRANSVERTER CONTROL
Transverter control circuit. Under
development
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TRANSVERTER
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The
tranverter switching and control board is simply two relays that
switch the RF and IF board ports to the antenna and transceiver and DC
supply to the various boards. The relays are operated by the transceiver
PTT port.
Fig 1 Schematic of the tranverter switching
and control board. This circuit is
subject to further development.
The Fig 1 Schematic shows the circuit as would
be reflected when the board was energised for the normal receiving
configuration, that is the R1 relay is open and R2 relay is closed
resulting in the antenna input being routed to the input of the receive
converter board and the IF transceiver being routed to the out put of
the receive converter board. Also the 12v supply is provided to the
common circuits such as the local oscillator and to the receive
converter board.
When the transverter is powered down
and the board in not energised then both R1 and R2 relays are open
resulting in the antenna input being routed
to the input of the receive converter board however the R1 relay being
open will ground the input of the antenna to ground. R1 relay being
open will also result in the IF transceiver being routed to the
transmit board so that the IF transceiver will only see a 50 ohm load
if accidentally keyed.
With the armed switch is closed and
IF
transceiver keyed will result in R1 relay is closed and R2 relay is
open resulting in the antenna input being routed to the out put of the
transmit board and the IF transceiver being routed to the input of the
transmit converter board. Also the 12v supply is provided to the
common circuits such as the local isolator and to the transmit
converter board, the receive board input is also switched to ground.
Fig 2 Viewing
through the top of the board and components to the under side vero board
layout.
Photo 1 Component
board is a un-etched copper clad board glued to a corresponding vero
board. Photo of top of board ready for component installation.
Photo 2 Components
installed.
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last revised 12 March 2022
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