I have mine set up for 80 khz and have absolutely no problems with temperature stability. In July for the FOBB, the top of my K1 got so hot I literally could not comfortably touch it. I was engrossed in the contest and didn't notice the sunlight through the trees focusing on the rig. In all that time, both heating up to sub-nuclear temperatures and cooling down to a comfortable 105 degrees in the shade, the K1 sat where ever I parked her.
If anyone has temperature stability problems, I'd look for a defect, not a design change. Eric KE6US www.ke6us.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Morrow Sent: Sunday, December 18, 2005 9:13 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K1 Future Improvements to VFO D3, R17,R18 any one tried?? Paul wrote: >Just reading page 59 of the K1 manual and it talks about provisions for >improvements to the VFO temperature compensation > >And the use of D3, R17 and R18. > >Anyone tried this out and done any before and after tests. I've heard no reports of such experiments in the five years that I've had a K1 (#175) and been on this list. Reed, K7FLY, in early 2001 reported some things he did to improve temperature stability not involving any actual circuit changes (except replacing an abnormally temperature sensitive VFO votage regulator), at: http://www.qsl.net/ve3mcf/elecraft_reflect/K1_Temperature_Freq_Drift_Mgmt.tx t My old K1 with 170 kHz VFO span (and no stability mods) is surprisingly temperature stable, and I've not been tempted in the least to improve what is already very very good. It was recently reported that at least one K1 owner found VFO stability to be better with the capacitor supplied for the 170 kHz span than with the capacitor for the 80 kHz span. I've never used the 80 kHz option, so I can't report on a similar comparison. 73, Mike / KK5F _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
