Tony, Some reading on the "huff puff" stabilization circuits:
http://www.hanssummers.com/radio/huffpuff/library/index.htm I built the one described in the Ham Radio August 1987 article using a Far Circuits board for my TR7. It cured a bad case of drift for me. 73 Clyde K9JWI On Sat, 2011-01-01 at 13:49 -0500, Richard A. (Tony) Stalls wrote: > My TR7 drifts around 100-150 Hz PTO during the first hour. After > that it calms down a bit, but it still drifts. I've come up with a > couple of potential solutions, but to be truthful, I don't know > enough to competently decide if they're what I want. > > The Swan guys tell me the Cumbria Designs X-Lock huff-puff type > frequency stabilizer (http://www.cumbriadesigns.co.uk/x-lock.htm) > guarantees < 10 Hz stability, but it's apparently better than > that. One person I know installed them in a Heathkit SB transceiver > (I forget which) and a Swan 270B Cygnet and measured the drift at about 3 Hz. > > I've also looked at the DL1SDQ "Digital Automatic Frequency Control" > (DAFC) huff-puff stabilizer (http://www.conny-dl1sdq.de) that he says > is intended for the TR7, although it appears it's not adaptable for > RV7. It's about $114 as compared to the X-Lock for about $30, as of > yesterday's Euro and Pound exchange rates. > > Does anybody have any experience with either of these huff-puff > stabilizers, or is there a better way? How about for the RV7? > > Thanks and Happy New Year! > > 73, > Tony > K4KYO > > > > _______________________________________________ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
