K3 Drift
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KV6X has noticed his temperature controlled crystal is drifting in his K3.
I notice it too. This is a new thing. I have never seen a post about K3 drift. Anyone had this problem?? Bob K7VO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]
Robert Sands
K7VO Olympia, WA |
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News to me, Bob -- but the modes you operate may
make it more or (in my case) less noticeable. It might be good if you provided more into: * Which modes? * Only after an extended key-down TX period or on receive, too? * How much drift in what period of time? * Do you have the KTCXO3-1TCXO installed in your K3? (which may be what you mean by "temperature controlled crystal") * How are you measuring the frequency to determine the drift -- i.e., how did you conclude it is drifing? that sort of thing. 73, Phil W7OX On 1/12/15 10:40 PM, Robert Sands wrote: > KV6X has noticed his temperature controlled crystal is drifting in his K3. > I notice it too. This is a new thing. I have never seen a post about K3 > drift. Anyone had this problem?? > Bob > K7VO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Guys,
Everything drifts. It is just a matter of how much and whether that amount is acceptable for the proposed use. I've done extensive drift measurements on the K3 and K3 with high stability oscillator. All comparisons were made to a RB locked oscillator. Up to three days of data was taken. These were " best case" comparisons (RX on only, no periods of transmit) and show the following at 10MHz. 1) The standard oscillator drifts 60- 100 Hz in the first couple hours. After that it stays within a couple Hz. 2) The high stability oscillator ( it is not temperature controlled because the feedback loop has not been implement) drifts about half that amount during a 4 hour period and is stable within a few Hz after that. Both meet the specs. What happens with periods of transmit at full power in those intervals is unknown. Most likely it would expand the range observed. The fact that few people observe drift, means that during a QSO or two, the drift is quite acceptable. It dosn't mean there is no drift. 73 de Brian/K3KO On 1/13/2015 1:57 AM, Phil Wheeler wrote: > News to me, Bob -- but the modes you operate may make it more or (in > my case) less noticeable. > > It might be good if you provided more into: > > * Which modes? > * Only after an extended key-down TX period or > on receive, too? > * How much drift in what period of time? > * Do you have the KTCXO3-1TCXO installed in your > K3? (which may be what you mean by > "temperature controlled crystal") > * How are you measuring the frequency to > determine the drift -- i.e., how did you > conclude it is drifing? > > that sort of thing. > > 73, Phil W7OX > > On 1/12/15 10:40 PM, Robert Sands wrote: >> KV6X has noticed his temperature controlled crystal is drifting in >> his K3. >> I notice it too. This is a new thing. I have never seen a post about K3 >> drift. Anyone had this problem?? >> Bob >> K7VO > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2249 / Virus Database: 4257/8413 - Release Date: 01/12/15 > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Robert Sands
Nearly all radios have some drift
You can minimize it by leaving the radio on or allowing it to be on a while before using it.The high stability option does make it better and a GPSDO will essentially eliminate it. Drift is most pronounced in the digital modes and in the upper bands. From: Robert Sands <[hidden email]> To: K2 <[hidden email]> Sent: Tuesday, January 13, 2015 1:40 AM Subject: [Elecraft] K3 Drift KV6X has noticed his temperature controlled crystal is drifting in his K3. I notice it too. This is a new thing. I have never seen a post about K3 drift. Anyone had this problem?? Bob K7VO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Nearly all radios have some drift. You can minimize it by leaving the radio on or allowing it to be on a while before using it.The high stability option does make it better and a GPSDO will essentially eliminate it. Drift is most pronounced in the digital modes and in the upper bands. Another culprit is having a cold shack in wintertime, the initialturn on until warm-up can show a fair amount of thermal drift From: Robert Sands <[hidden email]> To: K2 <[hidden email]> Sent: Tuesday, January 13, 2015 1:40 AM Subject: [Elecraft] K3 Drift KV6X has noticed his temperature controlled crystal is drifting in his K3. I notice it too. This is a new thing. I have never seen a post about K3 drift. Anyone had this problem?? Bob K7VO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Robert Sands
I just did a freq. calibration of my K3.
with the dial set to 9.999.000 in usb for wwv at 10 mhz, that gave me a 1 khz tone that I sent to the computer using Spectran that will show the freq of the audio. I was able to set thr REF CAL in the K3 to be within .03 cycle of dead beat. I calibrated my Xtal reference osc dead beat with wwv. and then set the K3 to 6 meters , dial set to 49.999.000 to give a 1 khz tone and checked the 5 harmonic of the xtal osc. and found that the K3 was only off 8.68 cycles. due to the fact I was using the 5th harmonic of the xtal osc there is some small error. I did a freq drift check before doing the above and found my K3 had a drift of only 8.5 cycles over a 2 hour warm up..... to me this is darn good... Ed KD7PY (ex K7WIA) |
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Yes it is good
I never really had and issues even when I was using the stock oscillator and running JT-65 I went to the High Stability and a GPSDO because I'm of German Decent ;) From: KD7PY <[hidden email]> To: [hidden email] Sent: Tuesday, January 13, 2015 4:52 PM Subject: Re: [Elecraft] K3 Drift I just did a freq. calibration of my K3. with the dial set to 9.999.000 in usb for wwv at 10 mhz, that gave me a 1 khz tone that I sent to the computer using Spectran that will show the freq of the audio. I was able to set thr REF CAL in the K3 to be within .03 cycle of dead beat. I calibrated my Xtal reference osc dead beat with wwv. and then set the K3 to 6 meters , dial set to 49.999.000 to give a 1 khz tone and checked the 5 harmonic of the xtal osc. and found that the K3 was only off 8.68 cycles. due to the fact I was using the 5th harmonic of the xtal osc there is some small error. I did a freq drift check before doing the above and found my K3 had a drift of only 8.5 cycles over a 2 hour warm up..... to me this is darn good... Ed KD7PY (ex K7WIA) -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-Drift-tp7597035p7597073.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by KD7PY
Ed's experience is pretty common. When I was curious about that, I had
a similar experience. Enough to know not to ever worry about it again. I have the TCXO. 73, Guy. On Tue, Jan 13, 2015 at 4:52 PM, KD7PY <[hidden email]> wrote: > I just did a freq. calibration of my K3. > with the dial set to 9.999.000 in usb for wwv at 10 mhz, that gave me a 1 > khz tone that I sent to the computer using Spectran that will show the freq > of the audio. I was able to set thr REF CAL in the K3 to be within .03 cycle > of dead beat. I calibrated my Xtal reference osc dead beat with wwv. and > then set the K3 to 6 meters , dial set to 49.999.000 to give a 1 khz tone > and checked the 5 harmonic of the xtal osc. and found that the K3 was only > off 8.68 cycles. due to the fact I was using the 5th harmonic of the xtal > osc there is some small error. I did a freq drift check before doing the > above and found my K3 had a drift of only 8.5 cycles over a 2 hour warm > up..... > > to me this is darn good... > > Ed KD7PY (ex K7WIA) > > > > > -- > View this message in context: http://elecraft.365791.n2.nabble.com/K3-Drift-tp7597035p7597073.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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