[TenTec] VFO Stabilizer question

[Mike Stricker via TenTec]

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