[K3] KTCXO3 obsolete?
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With the new KSYN3A modules now shipping in the K3, does it still make sense to equip a KTCXO3 module?
73, Matt VK2RQ ______________________________________________________________ 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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Hello Matt,
I trust the KTCXO3 is to provide better stability of reference frequency. I think you will need it for digital mode. 73 Johnny VR2XMC 寄件人︰ Matt VK2RQ <[hidden email]> 收件人︰ "<[hidden email]>" <[hidden email]> 傳送日期︰ 2015年04月20日 (週一) 6:52 PM 主題︰ [Elecraft] [K3] KTCXO3 obsolete? With the new KSYN3A modules now shipping in the K3, does it still make sense to equip a KTCXO3 module? 73, Matt VK2RQ ______________________________________________________________ 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] |
Re: [K3] KTCXO3 obsolete?
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In reply to this post by vk2rq
It depends on what you are doing with it
If you are running the Digital Modes then Yes I would add it From: Matt VK2RQ <[hidden email]> To: "<[hidden email]>" <[hidden email]> Sent: Monday, April 20, 2015 6:52 AM Subject: [Elecraft] [K3] KTCXO3 obsolete? With the new KSYN3A modules now shipping in the K3, does it still make sense to equip a KTCXO3 module? 73, Matt VK2RQ ______________________________________________________________ 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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The K3 is more than stable enough for digital modes w/o it....
73, Ross N4RP On 4/20/2015 9:30 AM, Harry Yingst via Elecraft wrote: > It depends on what you are doing with it > If you are running the Digital Modes then Yes I would add it > > > > From: Matt VK2RQ <[hidden email]> > To: "<[hidden email]>" <[hidden email]> > Sent: Monday, April 20, 2015 6:52 AM > Subject: [Elecraft] [K3] KTCXO3 obsolete? > > With the new KSYN3A modules now shipping in the K3, does it still make sense to equip a KTCXO3 module? > > 73, > Matt VK2RQ > ______________________________________________________________ > 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] -- FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.” ______________________________________________________________ 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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Especially after a 2 hr warmup.
From a cold start it can drift >50 Hz on 20M. 73 de Brian/K3KO On 4/20/2015 13:34 PM, Ross Primrose wrote: > The K3 is more than stable enough for digital modes w/o it.... > > 73, Ross N4RP > > On 4/20/2015 9:30 AM, Harry Yingst via Elecraft wrote: >> It depends on what you are doing with it >> If you are running the Digital Modes then Yes I would add it >> >> >> >> From: Matt VK2RQ <[hidden email]> >> To: "<[hidden email]>" <[hidden email]> >> Sent: Monday, April 20, 2015 6:52 AM >> Subject: [Elecraft] [K3] KTCXO3 obsolete? >> With the new KSYN3A modules now shipping in the K3, does it still >> make sense to equip a KTCXO3 module? >> >> 73, >> Matt VK2RQ >> ______________________________________________________________ >> 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] > > ______________________________________________________________ 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 Johnny Siu
Thanks Johnny. The reason I ask is that I saw it mentioned elsewhere that the new synth board is based on the Si570 chip. This chip runs on its own internal crystal oscillator, and does not have any input for an external reference clock. The Si571 does have a built-in TCXO, but I'm wondering how the external TCXO on the KTCXO3 works with this new synth board (maybe there is a frequency comparison done in DSP to work out a "frequency correction factor"?).
73, Matt VK2RQ > On 20 Apr 2015, at 9:02 pm, Johnny Siu <[hidden email]> wrote: > > Hello Matt, > > I trust the KTCXO3 is to provide better stability of reference frequency. I think you will need it for digital mode. > > 73 > > Johnny VR2XMC > > 寄件人�U Matt VK2RQ <[hidden email]> > 收件人�U "<[hidden email]>" <[hidden email]> > �魉腿掌讴U 2015年04月20日 (�L一) 6:52 PM > 主�}�U [Elecraft] [K3] KTCXO3 obsolete? > > With the new KSYN3A modules now shipping in the K3, does it still make sense to equip a KTCXO3 module? > > 73, > Matt VK2RQ > > ______________________________________________________________ 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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Thinking about it, maybe there is a frequency counter using the KTCXO3 as a reference clock, which measures the frequency of the Si570 output, and the DSP compares the measured frequency to the frequency requested to calculate a correction factor. In this way, there would be a benefit to adding the KTCXO3 to a K3 with the new synth board.
73, Matt VK2RQ > On 21 Apr 2015, at 1:25 am, Matt VK2RQ <[hidden email]> wrote: > > Thanks Johnny. The reason I ask is that I saw it mentioned elsewhere that the new synth board is based on the Si570 chip. This chip runs on its own internal crystal oscillator, and does not have any input for an external reference clock. The Si571 does have a built-in TCXO, but I'm wondering how the external TCXO on the KTCXO3 works with this new synth board (maybe there is a frequency comparison done in DSP to work out a "frequency correction factor"?). > > 73, Matt VK2RQ > >> On 20 Apr 2015, at 9:02 pm, Johnny Siu <[hidden email]> wrote: >> >> Hello Matt, >> >> I trust the KTCXO3 is to provide better stability of reference frequency. I think you will need it for digital mode. >> >> 73 >> >> Johnny VR2XMC >> >> 寄件人�U Matt VK2RQ <[hidden email]> >> 收件人�U "<[hidden email]>" <[hidden email]> >> �魉腿掌讴U 2015年04月20日 (�L一) 6:52 PM >> 主�}�U [Elecraft] [K3] KTCXO3 obsolete? >> >> With the new KSYN3A modules now shipping in the K3, does it still make sense to equip a KTCXO3 module? >> >> 73, >> Matt VK2RQ >> >> ______________________________________________________________ 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 Johnny Siu
If the new KSYN3A makes the TCXO-3 obsolete then the EXREF is also
obsolete and all of us that invested into that either cannot upgrade to KSYN3A or we lose the use of these improvements. That is not backwards compatible. I seriously doubt that the TCXO-1 or TXCO-3 is not used by the new synth. I use my K3 as IF rig for 1296-eme and "slopping" around 50 to 500 Hz is not acceptable! OK, I exaggerate a little. But not only is the TCXO-3 more stable it is also more accurate. With addition of EXREF I get 28-MHz +/- 2-Hz accuracy which a big help when looking for super-weak signals on 1296-eme (my 1296-28 transverter is PLL with < 1-Hz*). Running JT-65 (not HF) on eme requires less than 20-Hz drift when operating key-down for 50 seconds out a 2-minutes. I get that using the K3 w/TCXO-3+EXREF. *PS: frequency drift = K3 drift + transverter drift (its additive) 73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: [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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Folks:
Reading the data sheet for the Si571 I see the worst case temperature stability is +/- 61.5 ppm. This would say the 571 could NOT possibly be used as a standalone frequency source. It MUST be corrected. I would conclude the TCXO is need as before wherever high accuracy and high stability is needed. 73 Fred, AE6QL -----Original Message----- From: Elecraft [mailto:[hidden email]] On Behalf Of Edward R Cole Sent: Monday, April 20, 2015 10:01 AM To: [hidden email] Subject: Re: [Elecraft] KTCXO3 obsolete? If the new KSYN3A makes the TCXO-3 obsolete then the EXREF is also obsolete and all of us that invested into that either cannot upgrade to KSYN3A or we lose the use of these improvements. That is not backwards compatible. I seriously doubt that the TCXO-1 or TXCO-3 is not used by the new synth. I use my K3 as IF rig for 1296-eme and "slopping" around 50 to 500 Hz is not acceptable! OK, I exaggerate a little. But not only is the TCXO-3 more stable it is also more accurate. With addition of EXREF I get 28-MHz +/- 2-Hz accuracy which a big help when looking for super-weak signals on 1296-eme (my 1296-28 transverter is PLL with < 1-Hz*). Running JT-65 (not HF) on eme requires less than 20-Hz drift when operating key-down for 50 seconds out a 2-minutes. I get that using the K3 w/TCXO-3+EXREF. *PS: frequency drift = K3 drift + transverter drift (its additive) 73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: [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] ______________________________________________________________ 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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Fred,
You're correct. We use the Si570 in the KSYN3A to obtain extremely low phase noise. But we still have to lock it to the 49.38-MHz reference. The synth stays locked to the reference within about +/- 0.2 Hz on all bands. This is a definite improvement over the original KSYN3. 73, Wayne On Apr 20, 2015, at 10:36 AM, "Fred Townsend" <[hidden email]> wrote: > Folks: > Reading the data sheet for the Si571 I see the worst case temperature > stability is +/- 61.5 ppm. This would say the 571 could NOT possibly be used > as a standalone frequency source. It MUST be corrected. I would conclude the > TCXO is need as before wherever high accuracy and high stability is needed. > 73 > Fred, AE6QL ______________________________________________________________ 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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