[Elecraft] KTCXO3-1 TCXO 1 PPM
Hi, I have a pretty well loaded K3, has anyone changed out the OSC on on a K3 before, and could you share your thoughts on how difficult it would be, or if there are any issues you have run into? I reviewed the instructions, and it looks very simple, and to be about a 10 minutes job... Is it actually that easy to install? -- Thanks and 73's, For equipment, and software setups and reviews see: www.nk7z.net for MixW support see; http://groups.yahoo.com/neo/groups/mixw/info for Dopplergram information see: http://groups.yahoo.com/neo/groups/dopplergram/info for MM-SSTV see: http://groups.yahoo.com/neo/groups/MM-SSTV/info __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KTCXO3-1 TCXO 1 PPM
Is it actually that easy to install? Yes, it is. Just remember, you really do want to use a static mat and wrist strap whenever you open up your K3 to work on something internal to it. I ran with the KTCXO3-1 from the time I built my K3 two years ago, but then added the K3EXREF and a Trimble Thunderbolt this spring. However, should there be a problem either of the latter, I know I can quickly and easily revert to the KTCXO3-1 as needed. It's a heady experience to know that when I set the frequency on the K3, it's accurate to the last Hertz - a far cry from the 75A-3 I used as a Novice. 73 de N1HO __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KTCXO3-1 TCXO
Thanks you all for responding to this. I also note that it takes around an hour for the larger corrections to settle down and several hours for complete stability to set in. I've been monitoring my front panel temperature sensor which normally runs 36 C with the radio on for several hours and a shack temperature of 75 F degrees. From a cold start up at 24 C, it normally takes about an hour to reach a constant temperature of 36 C on the FP. I know the FP temp reading and TCXO are separate pieces but at the point of 36 C, I have really notice the TCXO to settle out. Date: Sun, 3 Feb 2013 09:22:57 -0900 To: Elecraft@mailman.qth.net From: kl...@acsalaska.net Subject: [Elecraft] KTCXO3-1 TCXO Date: Sun, 3 Feb 2013 08:45:36 -0600 From: Chad Wasinger chadwasin...@outlook.com To: elecraft@mailman.qth.net elecraft@mailman.qth.net Subject: [Elecraft] KTCXO3-1 TCXO Message-ID: bay002-w97bd9bbec8db9494e84bf3c0...@phx.gbl Content-Type: text/plain; charset=iso-8859-1 Does anyone know the approximate warm-up/stabilize time of the KTCXO3-1? Thanks,ChadN0YK Chad, I observed the action of my TCXO3-1 closely after initial installation of the EXREF. I noted from cold start up that the TCXO was receiving a continued updated offset for about 20 to 30 minutes, whereby it stabilized out at about an offset of about 78-80. From that time on the offset would only wander a couple points over several minutes. A check of my 28-MHz transmit frequency accuracy was within 2-Hz (indicating 0.1 ppm) and would only occasionally change by 1-Hz reflecting the slow drift of the TCXO between reference checks with the external 10-MHz source. Running the TCXO-3 without the EXREF accuracy is aprox. 0.5ppm or on 28-MHz this translates to a maximum error of +/- 14-Hz. Freq. measurements are made with an EIP-538 microwave counter that is referenced to a Rubidium 10-MHz reference. The K3EXREF is referenced to a separate OCXO which is run on a battery full-time. Short-term stability of the OCXO is +/-5 E-12, Long-term stability is +/-5 E-5 which requires adjustment about every four months to correct about 1-Hz long-term drift. I have a 200K ten-turn helipot for adjusting the OCXO frequency. I use my Rubidium as frequency reference which is +/- 5 E-11 after 30-min warmup. GPS is more accurate but I find the Rubidium sufficient for my needs. eg: 10-MHz is 1.0 E+7, multiplied by 5 E-11 = 5.0 E-4 Hz = 0.0005 Hz See details of the EXREF (and TCXO3-1): http://www.kl7uw.com/K3EXREF.htm 73, Ed - KL7UW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KTCXO3-1 TCXO
Side question: Does anyone know the exact location of the temperature sensor for the FP reading on the K3? From: chadwasin...@outlook.com To: kl...@acsalaska.net; elecraft@mailman.qth.net Date: Mon, 4 Feb 2013 09:24:44 -0600 Subject: Re: [Elecraft] KTCXO3-1 TCXO Thanks you all for responding to this. I also note that it takes around an hour for the larger corrections to settle down and several hours for complete stability to set in. I've been monitoring my front panel temperature sensor which normally runs 36 C with the radio on for several hours and a shack temperature of 75 F degrees. From a cold start up at 24 C, it normally takes about an hour to reach a constant temperature of 36 C on the FP. I know the FP temp reading and TCXO are separate pieces but at the point of 36 C, I have really notice the TCXO to settle out. Date: Sun, 3 Feb 2013 09:22:57 -0900 To: Elecraft@mailman.qth.net From: kl...@acsalaska.net Subject: [Elecraft] KTCXO3-1 TCXO Date: Sun, 3 Feb 2013 08:45:36 -0600 From: Chad Wasinger chadwasin...@outlook.com To: elecraft@mailman.qth.net elecraft@mailman.qth.net Subject: [Elecraft] KTCXO3-1 TCXO Message-ID: bay002-w97bd9bbec8db9494e84bf3c0...@phx.gbl Content-Type: text/plain; charset=iso-8859-1 Does anyone know the approximate warm-up/stabilize time of the KTCXO3-1? Thanks,ChadN0YK Chad, I observed the action of my TCXO3-1 closely after initial installation of the EXREF. I noted from cold start up that the TCXO was receiving a continued updated offset for about 20 to 30 minutes, whereby it stabilized out at about an offset of about 78-80. From that time on the offset would only wander a couple points over several minutes. A check of my 28-MHz transmit frequency accuracy was within 2-Hz (indicating 0.1 ppm) and would only occasionally change by 1-Hz reflecting the slow drift of the TCXO between reference checks with the external 10-MHz source. Running the TCXO-3 without the EXREF accuracy is aprox. 0.5ppm or on 28-MHz this translates to a maximum error of +/- 14-Hz. Freq. measurements are made with an EIP-538 microwave counter that is referenced to a Rubidium 10-MHz reference. The K3EXREF is referenced to a separate OCXO which is run on a battery full-time. Short-term stability of the OCXO is +/-5 E-12, Long-term stability is +/-5 E-5 which requires adjustment about every four months to correct about 1-Hz long-term drift. I have a 200K ten-turn helipot for adjusting the OCXO frequency. I use my Rubidium as frequency reference which is +/- 5 E-11 after 30-min warmup. GPS is more accurate but I find the Rubidium sufficient for my needs. eg: 10-MHz is 1.0 E+7, multiplied by 5 E-11 = 5.0 E-4 Hz = 0.0005 Hz See details of the EXREF (and TCXO3-1): http://www.kl7uw.com/K3EXREF.htm 73, Ed - KL7UW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KTCXO3-1 TCXO
Does anyone know the approximate warm-up/stabilize time of the KTCXO3-1? Thanks,ChadN0YK __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KTCXO3-1 TCXO
A guess is 10-15 minutes. I call it a guess because the KX3's TCXO is either similar or identical to the K3's, and the setup for temperature compensating the KX3's OSC requires 10-15 minutes of run time before the procedure is started. Even without the temp compensation, KX3 #6 was stable to +/- 5 Hz on 6m, well before 10 minutes passed by. 73, matt W6NIA On Sun, 03 Feb 2013 08:45:36 -0600, you wrote: Does anyone know the approximate warm-up/stabilize time of the KTCXO3-1? Thanks,ChadN0YK __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KTCXO3-1 TCXO warm up time to stabilize
Greetings, I find that 3 hours in 70F room is required to reach stabilized frequency. Jim, N8OQ __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] KTCXO3-1 TCXO
Date: Sun, 3 Feb 2013 08:45:36 -0600 From: Chad Wasinger chadwasin...@outlook.com To: elecraft@mailman.qth.net elecraft@mailman.qth.net Subject: [Elecraft] KTCXO3-1 TCXO Message-ID: bay002-w97bd9bbec8db9494e84bf3c0...@phx.gbl Content-Type: text/plain; charset=iso-8859-1 Does anyone know the approximate warm-up/stabilize time of the KTCXO3-1? Thanks,ChadN0YK Chad, I observed the action of my TCXO3-1 closely after initial installation of the EXREF. I noted from cold start up that the TCXO was receiving a continued updated offset for about 20 to 30 minutes, whereby it stabilized out at about an offset of about 78-80. From that time on the offset would only wander a couple points over several minutes. A check of my 28-MHz transmit frequency accuracy was within 2-Hz (indicating 0.1 ppm) and would only occasionally change by 1-Hz reflecting the slow drift of the TCXO between reference checks with the external 10-MHz source. Running the TCXO-3 without the EXREF accuracy is aprox. 0.5ppm or on 28-MHz this translates to a maximum error of +/- 14-Hz. Freq. measurements are made with an EIP-538 microwave counter that is referenced to a Rubidium 10-MHz reference. The K3EXREF is referenced to a separate OCXO which is run on a battery full-time. Short-term stability of the OCXO is +/-5 E-12, Long-term stability is +/-5 E-5 which requires adjustment about every four months to correct about 1-Hz long-term drift. I have a 200K ten-turn helipot for adjusting the OCXO frequency. I use my Rubidium as frequency reference which is +/- 5 E-11 after 30-min warmup. GPS is more accurate but I find the Rubidium sufficient for my needs. eg: 10-MHz is 1.0 E+7, multiplied by 5 E-11 = 5.0 E-4 Hz = 0.0005 Hz See details of the EXREF (and TCXO3-1): http://www.kl7uw.com/K3EXREF.htm 73, Ed - KL7UW __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
