some progress

Last weekend I did a few things. Not as much as I hoped though.

I modified the CB radio. When it transmits it also outputs a DC voltage on the antenna connector. That DC voltage will be used to switch the TX/RX relais.
The voltage is connected through a 2k2 resistor.So a transistor must be used in the transverter to switch the relais.

In the transverter the TX/RX relais circuit has been made. The TX RX switch works fine.

I made a simple lowpass filter for the audio of the CB set.

I did some experiments with varicaps to control the frequency of the LO. I did use a 35pf trimmer. The 20 MHz xtal could be varied 20 KHz using this trimmer. Unfortunately I was unable to pull the frequency more than 10 KHz using varicaps.