Hi,
There are several versions of the huff-puff controller floating around with
minor improvements as they evolved. I built one up for my Swan 100MXA, which I
regularly use to check into the Ten Tec nets. The only issue with them are
that you give up the use of your RIT function since that is normlly controlled
by a varicap diode and the huff-puff compensates for the drift by adding or
subtracting an offset voltage to that.
Someone sells them for around $70 or $80 but there really is only about $5.00
worth of parts. I wound up using a TCXO oscillator module that I had instead
of build the oscillator out of discretes. I found that this circuit makes a
very nice addition to my radio.
Here are a couple of links:
http://www.hanssummers.com/huffpuff.html
http://www.hanssummers.com/huffpuff/library.html
Mike, WA1SEO
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