For fun, I thought I'd make an archeological dig and take a look at how
things changed from NorCal 40a to K1 since they're easy to study. Then
I realized part of it is not so easy for me. The 40a uses a Cohn filter
and I thought I'd run through analysis (not simulation) of it. Again,
just fo
Hi Mike,
I can probably scrounge up the original Lm and other specs for you.
Varactor capacitance vs. voltage for the parts I used in the design is readily
available on the web. Just search for the part datasheet.
Varactor tuning of the filter is great for varying the bandwidth, but it is a
co
Thanks, Wayne. If not too much trouble that would be great. Or even a
run down of how you got the values. Maybe I'm just looking in the wrong
place. And I guess the ripple doesn't matter too much for a cw-only qrp
rig?
It would be very interesting to read a technical "why we changed this"
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