); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Try DigiKey pn: 235-1123-ND for a simple PTC Thermistor that can be soldered to the xtal case if one were so inclined. Do so at your own risk to the xtal!
-Brian -------------- Original message ---------------------- From: John Ackermann N8UR <[EMAIL PROTECTED]> > > [EMAIL PROTECTED] said the following on 10/10/2007 02:17 PM: > > In a message dated 10/10/2007 11:13:21 Pacific Daylight Time, [EMAIL > > PROTECTED] > > writes: > > > >> We first built a small proportional heater circuit that we could shove > >> in next to the crystal, and that worked OK. We finally found a source > >> for thermistors spot welded to a spring clip that would mount snugly > >> directly to the crystal case. With 12 volts applied, these heated the > >> crystals very nicely. With the heaters, we were able to keep the > >> systems running year round with about 1/10 the service calls. > > > > Hi John, > > > > interesting anecdote! > > > > Would you know if the thermistors are still available? Who made them? > > We bought them as a replacement part from Yaesu USA. This data is 10 > years or more old, but here you go: > > Part Name Yaesu Part Number Murata Part Number > Posistor G9090019 PTH507A01BG330N020 > > They used to be about $7.00 each. Yaesu's parts-order phone number at > the time was (800) 255-9237. I'm not sure if there's another source for > the Murata part; back then, we couldn't find one. > > Amazingly, I still have a web page documenting all that we learned about > those cursed radios, including the schematic of our original homebrew > heater design: http://www.febo.com/hamdocs/d4art.html. The quality of > the heater schematic isn't very good, but it's all I have. > > John > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
