Re: [Elecraft] K1 build question: T1, turn count method.
Measuring the inductance is not a good approach unless you have a way of measuring it at a specific frequency. The toroid material’s effect on the inductance of the finished coil varies with frequency, and most LC meters use a frequency below the HF range. Victor 4X6GP > On 30 May 2020, at 0:16, Paul Gacek via Elecraft > wrote: > > John > > Fair question as to why not. > > I guess it boils down to tolerance in the design. As T1 and T2 are impedance > matches maybe my error isn’t going to push things out of tolerance. > > That written, the consensus feed back is I have counted the turns wrong on T1 > and it’s easy enough to reduce a turn (versus adding one!). > > I just completed the front panel tests and so before heading into the VFO > alignment, I’ll make the correction. > > For all the inductors (such as L9,L10 etc) I measure the inductance before > installing them. > > Paul > >> On May 29, 2020, at 1:31 PM, John Harper wrote: >> >> Why would you choose not correct a known error? >> >> Correct it and rule it out as a possible culprit in the event you have a >> problem with the radio. If you don't correct it, and end up having a >> problem, you'll wonder >> >> John AE5X >> https://ae5x.blogspot.com >> >>> Any guidance on whether I should correct this is welcome. >> __ >> 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 w6...@yahoo.com > > __ > 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 k2vco@gmail.com __ 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] K1 build question: T1, turn count method.
Paul, As far as measuring the inductances, the listed values are only average. Count the toroid turns correctly and there will be no problem. 73, Don W3FPR On 5/29/2020 5:16 PM, Paul Gacek via Elecraft wrote: John Fair question as to why not. I guess it boils down to tolerance in the design. As T1 and T2 are impedance matches maybe my error isn’t going to push things out of tolerance. That written, the consensus feed back is I have counted the turns wrong on T1 and it’s easy enough to reduce a turn (versus adding one!). I just completed the front panel tests and so before heading into the VFO alignment, I’ll make the correction. For all the inductors (such as L9,L10 etc) I measure the inductance before installing them. Paul On May 29, 2020, at 1:31 PM, John Harper wrote: Why would you choose not correct a known error? Correct it and rule it out as a possible culprit in the event you have a problem with the radio. If you don't correct it, and end up having a problem, you'll wonder John AE5X https://ae5x.blogspot.com Any guidance on whether I should correct this is welcome. __ 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 w6...@yahoo.com __ 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 donw...@embarqmail.com __ 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] K1 build question: T1, turn count method.
Paul, Yes, correct the turns count on T1 and T2 if necessary. The impedance matching is important for full power output. You are not the first to miscount the turns on a toroid (adding an extra turn). Remember that a single wire through the core is one turn and a full wrap around the core is 2 turns. That is especially important for the toroids in the LPF on the band board. 73, Don W3FPR On 5/29/2020 5:16 PM, Paul Gacek via Elecraft wrote: John Fair question as to why not. I guess it boils down to tolerance in the design. As T1 and T2 are impedance matches maybe my error isn’t going to push things out of tolerance. That written, the consensus feed back is I have counted the turns wrong on T1 and it’s easy enough to reduce a turn (versus adding one!). I just completed the front panel tests and so before heading into the VFO alignment, I’ll make the correction. For all the inductors (such as L9,L10 etc) I measure the inductance before installing them. Paul __ 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] K1 build question: T1, turn count method.
Thanks all for the feedback. T1 correction is now made and now off to make a cup of tea (there’s a Brit in me somewhere). Paul Gacek W6PNG/M0SNA Www.nomadic.blog > On May 29, 2020, at 1:51 PM, Fred Jensen wrote: > > You count "passages through the hole" as turns in all cases with toroid > cores. A straight wire thru the donut is one turn. I can't answer your > question ["does it make a difference?"] because I don't have a K1, but I did > build a K2, and based on that, I think the answer is "Yes, it will make a > difference." > > 73, > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > >> On 5/29/2020 12:49 PM, Paul Gacek via Elecraft wrote: >> I have completed the RF board RX build portion and about to test it with the >> filter board and front panel. >> >> I realize I may have a discrepancy on turns for T1. I count a turn by >> tracing the wire around the toroid and get 4 turns of green but the manual >> page 14 states I should count a turn each time the wire passes through the >> center of the toroid which is 5. >> >> As T1 is an impedance match (1:5?) will the “extra” turn make a huge >> difference? >> >> Intuitively I would say yes as it’s 20% more turns by the page 14 method. >> >> Any guidance on whether I should correct this is welcome. >> >> Paul >> W6PNG/M0SNA >> www.nomadic.blog >> > > __ > 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 w6...@yahoo.com __ 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] K1 build question: T1, turn count method.
John Fair question as to why not. I guess it boils down to tolerance in the design. As T1 and T2 are impedance matches maybe my error isn’t going to push things out of tolerance. That written, the consensus feed back is I have counted the turns wrong on T1 and it’s easy enough to reduce a turn (versus adding one!). I just completed the front panel tests and so before heading into the VFO alignment, I’ll make the correction. For all the inductors (such as L9,L10 etc) I measure the inductance before installing them. Paul > On May 29, 2020, at 1:31 PM, John Harper wrote: > > Why would you choose not correct a known error? > > Correct it and rule it out as a possible culprit in the event you have a > problem with the radio. If you don't correct it, and end up having a > problem, you'll wonder > > John AE5X > https://ae5x.blogspot.com > >> Any guidance on whether I should correct this is welcome. > __ > 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 w6...@yahoo.com __ 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] K1 build question: T1, turn count method.
You count "passages through the hole" as turns in all cases with toroid cores. A straight wire thru the donut is one turn. I can't answer your question ["does it make a difference?"] because I don't have a K1, but I did build a K2, and based on that, I think the answer is "Yes, it will make a difference." 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 5/29/2020 12:49 PM, Paul Gacek via Elecraft wrote: I have completed the RF board RX build portion and about to test it with the filter board and front panel. I realize I may have a discrepancy on turns for T1. I count a turn by tracing the wire around the toroid and get 4 turns of green but the manual page 14 states I should count a turn each time the wire passes through the center of the toroid which is 5. As T1 is an impedance match (1:5?) will the “extra” turn make a huge difference? Intuitively I would say yes as it’s 20% more turns by the page 14 method. Any guidance on whether I should correct this is welcome. Paul W6PNG/M0SNA www.nomadic.blog __ 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
[Elecraft] K1 build question: T1, turn count method.
Why would you choose not correct a known error? Correct it and rule it out as a possible culprit in the event you have a problem with the radio. If you don't correct it, and end up having a problem, you'll wonder John AE5X https://ae5x.blogspot.com > Any guidance on whether I should correct this is welcome. __ 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
[Elecraft] K1 build question: T1, turn count method.
I have completed the RF board RX build portion and about to test it with the filter board and front panel. I realize I may have a discrepancy on turns for T1. I count a turn by tracing the wire around the toroid and get 4 turns of green but the manual page 14 states I should count a turn each time the wire passes through the center of the toroid which is 5. As T1 is an impedance match (1:5?) will the “extra” turn make a huge difference? Intuitively I would say yes as it’s 20% more turns by the page 14 method. Any guidance on whether I should correct this is welcome. Paul W6PNG/M0SNA www.nomadic.blog __ 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
