Thanks for advice dear Hans,
Sure the instability of the vfo will increase the the frequency increase.
I was amazed by the one-chip huff&puff circuit on your site with the 32MHz xtal.
Effective and very simple! I knew that zenerdiodes could be used as varicaps, but led's that's new for me.
Try this one if you are interested in homebrew Panoramareceivers:
Have fun,
Ron
Hans Summers wrote:
Hi Ron
Thanks for the nice complements about my website :-)? I had a look around
your website this morning, you have some very interesting projects there. I
sent an email to a fellow who I know is interested in panoramic adapters and
has been corresponding with me about my spectrum analyser (
)
If you are going to build one of the earlier designs, I have most of the
Huff Puff articles in my reference library for download, see
. In performance
terms, I think my 2-chip simplification should perform as well as the
original Huff Puff
designs. For the ultimate performance, G7IXH's "fast"
stabiliser is slightly more complex but performs best.
I do know that people have used BITX20's for PSK31 very successfully. But
don't forget that your VFO for 17m is twice the BITX20 VFO's frequency,
therefore it is bound to be less stable (all other things being equal).
73 Hans G0UPL
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