NorCal 40 digital VFO version on Choc perfboard

Adam Rong


Job is done. I get full 40-meter coverage without birdie on 7.023 MHz because my digital VFO outputs operating frequency plus BFO frequency. The bandwidth of the crystal filter seems a bit wide and I will figure out later once I have time.

The sidetone is pure but a bit low. I will adjust the frequency delta later. The RF output is 1.2 watt. Not very good but acceptable because I replaced the PA transistor with a BD139, very cheap one. 

I believe the modification of NC40A is very necessary to fix my issues. As an experiment, I am quite satisfied with what I have now.


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