Hi Don’t get me wrong, the K1 is operating well within specs, its just not so stable as the K2 or the KX1 I have in the shack. If anyone thinks theirs is stable try this, feed the output of the K1 into a program that will allow a waterfall display to be configured that allows about 1 hours worth of trace on screen , I use a QRSS morse prog that seems to work well for this, use a signal generator (I use the XG1 by Elecraft as a source). Turn on the k1 from cold and quickly tune in the signal at 7.040 for about 700Hz trace on the pc. Now every 5 mins record the traces freq on the pc or just let the k1 run for a hour and look at the trace. After do the same test with the K2 or the KX1 . I would be Very supprised if you still say the K1 has no drift, one interesting thing is that the drift aways seem down in freq after the first few mins, from cold the first 2-3mins produce a up drift of 10-40 hz before drifting down, I find about 100Hz drift after the first 5 mins in one hour. Also while doing the above test put a load on the k1 and put the key down for 10 sec or so and see what happens when you go back to receive. In practice I don’t find it any problem at all after the first 5mins but since elecraft have taken the time to print details about possible drift mod im sure even they will accept that its not a defect in an individuals radio but a design problem using a none DDS vfo. If you do a lot of tuning around like many do in a contest and your QSO's are contest type (i.e. very short) you will never notice this drift im sure! The display on the K1 still indicates the correct freq at all times.
Regards Paul M0BMN -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of EricJ Sent: 18 December 2005 17:24 To: 'Mike Morrow'; [email protected] Subject: RE: [Elecraft] K1 Future Improvements to VFO D3, R17,R18 any one tried?? 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: [email protected] 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: [email protected] 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: [email protected] 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 -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.371 / Virus Database: 267.14.1/206 - Release Date: 16/12/2005 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.371 / Virus Database: 267.14.1/206 - Release Date: 16/12/2005 ___________________________________________________________ How much free photo storage do you get? Store your holiday snaps for FREE with Yahoo! Photos http://uk.photos.yahoo.com _______________________________________________ Elecraft mailing list Post to: [email protected] 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
