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TRANSVERTER CONTROL

Transverter control circuit. Under development


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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Page last revised 10 December, 2014  
 

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