Building VXO

Last night I built the VXO I also made an amplifier for this VXO.

The VXO can be pulled 20 KHz up with a single xtal and a 35 pf trimmer. Twenty KHz is enough so I may not need the super VXO configuration at all. However the tuning is not lineair. Maybe the super VXO has better lineairty, I will try it later.

For testing a use a trimmer to set the frequency.It will be replaced by a varicap eventally.

The signal out of the VXO is amplified by a 2N2219 amplifier. I delivers 80 mili watt. That is too much, the mixer needs 5 mw. I will reduce the power to 10 mili watt. The output signal will be fed to the mixer via a 3db attenuator. This attenuator wil improve the termination of the mixer.