SWR on 40 meters
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All of a sudden (I think) the SWR on one of my K3's (#1) is showing 1.5 to 1
into a dummy load on 40 meters only. All other bands the K3 (#1) shows 1 to 1, my other K3 (#2) shows 1 to 1 on all bands using the same dummy load and same piece of coax. I also noticed that on one antenna where the SWR is 2 to 1 on a bridge (and on K3 (#2)) it shows 1 to 1 on the K3 (#1). I guess this really doesn't affect anything (maybe power roll back). K3 (#1) has no ATU but new synt boards. K3 (#2) has an ATU (in bypass mode) but the older synt boards. Any ideas and thanks, Mike W9RE ______________________________________________________________ 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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How does the current drawn by #1 compare to that of #2 on 40 at the same
output power, same dummy load, etc? Power should be measured with an external meter. It doesn't have to be very accurate, just repeatable. If the currents are about the same, I'd suspect the SWR bridge in #1. If not, things get more interesting. Scott K9MA On 1/3/2017 23:34, Mike Wetzel wrote: > All of a sudden (I think) the SWR on one of my K3's (#1) is showing 1.5 to 1 > into a dummy load on 40 meters only. All other bands the K3 (#1) shows 1 to > 1, my other K3 (#2) shows 1 to 1 on all bands using the same dummy load and > same piece of coax. I also noticed that on one antenna where the SWR is 2 > to 1 on a bridge (and on K3 (#2)) it shows 1 to 1 on the K3 (#1). I guess > this really doesn't affect anything (maybe power roll back). > > > > K3 (#1) has no ATU but new synt boards. K3 (#2) has an ATU (in bypass mode) > but the older synt boards. > > > > Any ideas and thanks, > > > > Mike W9RE > > > > ______________________________________________________________ > -- Scott K9MA [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 W9RE
On Tue,1/3/2017 9:34 PM, Mike Wetzel wrote:
> Any ideas Bad coax or bad coax shield connection? 73, Jim K9YC ______________________________________________________________ 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 W9RE
Mike and Jim
I am having the same problem on 40 M only with one of two K3s. Both have new synth boards and antenna tuners bypassed. Jim W0UO On 1/4/2017 4:21 PM, [hidden email] wrote: > Send Elecraft mailing list submissions to > [hidden email] > > To subscribe or unsubscribe via the World Wide Web, visit > http://mailman.qth.net/mailman/listinfo/elecraft > or, via email, send a message with subject or body 'help' to > [hidden email] > > You can reach the person managing the list at > [hidden email] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Elecraft digest..." > > > Today's Topics: > > 1. Re: Audio artifacts in DATA A mode with KX3 (Wayne Burdick) > 2. Re: Audio artifacts in DATA A mode with KX3 (Nicklas Johnson) > 3. Re: Elecraft Website Hacked? (Richard Fjeld) > 4. Re: Elecraft Website Hacked? (Matt Murphy) > 5. Re: Kenwood MC-50 Mic and K2 (ken mcmahon) > 6. Re: Kenwood MC-50 Mic and K2 (Don Wilhelm) > 7. Macro for text decode (Mike Weir) > 8. Re: Macro for text decode (tomb18) > 9. Re: Macro for text decode (Don Wilhelm) > 10. Re: Macro for text decode (Ron D'Eau Claire) > 11. Re: Macro for text decode (Harry Yingst) > 12. Re: Macro for text decode (Don Wilhelm) > 13. Re: Macro for text decode (Tom) > 14. SWR on 40 meters (Mike Wetzel) > 15. Re: SWR on 40 meters (K9MA) > 16. Re: Audio artifacts in DATA A mode with KX3 (David Anderson) > 17. Re: Macro for text decode (Harry Yingst) > 18. Re: Macro for text decode (Cady, Fred) > 19. K3 Monitor function (Edward Seeliger) > 20. Re: K3 Monitor function (Tony G6GLP) > 21. Re: Audio artifacts in DATA A mode with KX3 (Carl J?n Denbow) > 22. K3 Monitor function (Edward Seeliger) > 23. Re: SWR on 40 meters (Jim Brown) > 24. For Sale: KX-2 s/n 8xx (Jack Colson) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 3 Jan 2017 13:45:10 -0800 > From: Wayne Burdick <[hidden email]> > To: David Anderson <[hidden email]> > Cc: Nicklas Johnson <[hidden email]>, elecraft > <[hidden email]> > Subject: Re: [Elecraft] Audio artifacts in DATA A mode with KX3 > Message-ID: <[hidden email]> > Content-Type: text/plain; charset=utf-8 > > This is on the KX3 firmware list. I'll move it up a notch. > > Wayne > N6KR > > > On Jan 3, 2017, at 12:16 AM, David Anderson via Elecraft <[hidden email]> wrote: > >> Nick, >> >> Thank you for bringing this up. >> >> I never did get a satisfactory explanation, I contacted support too but that didn't get me anywhere either, I don't think they understood my question, which is quite simple really, why can't we get the same bandwidth in Data mode as in SSB mode? I think it's a simple oversight, but nobody seemed interested in acknowledging it or fixing it. >> >> >> 73 from David GM4JJJ >> >>> On 2 Jan 2017, at 23:54, Nicklas Johnson <[hidden email]> wrote: >>> >>> J?rg in the Elecraft KX3 group on Facebook had an interesting observation: >>> with WJST's waterfall, if the "flatten" mode is on, it produces some >>> unusual artifacts in the presence of sharp spectrum drop-offs, and indeed >>> if I turn off the "flatten" feature and manually set the zero point for the >>> waterfall, the artifacts go away. >>> >>> It's still an open question as to why the data-a mode has a steep drop-off >>> at 400Hz when the PBT settings on the rig would seem to indicate otherwise, >>> and the same drop-off isn't there in USB mode. >>> >>> I see searching on "400 Hz" that GM4JJJ had the same question here on the >>> last back in July 2015, but never really got an answer. I basically have >>> the same question as this one: >>> https://www.mail-archive.com/elecraft@.../msg183837.html >>> >>> Nick >>> >>> >>>> On 2 January 2017 at 12:06, Nicklas Johnson <[hidden email]> wrote: >>>> >>>> I'm seeing some unexpected audio artifacts when using DATA A mode with the >>>> latest production firmware on my KX3, on all bands. This is something I >>>> observe when the PBT BW is set all the way wide (4KHz) and FC is centered. >>>> >>>> In DATA mode, there's an audio drop-off between 200 and 325 Hz, with an >>>> almost completely dead audio "hole" between 250 and 300 Hz. Then there's >>>> some additional noise between 350 and 500 Hz. >>>> >>>> If I switch to USB mode (with no EQ or audio effects applied, naturally), >>>> all of these artifacts go away, and it's perfectly smooth across the >>>> spectrum. No drop-off, no noise. >>>> >>>> Pictures of the waterfalls for comparison here: http://imgur.com/a/AjHu4 >>>> >>>> Am I doing something wrong, or is there something I should check? I've >>>> taken the usual steps, but it's plausible I've missed something. >>>> >>>> ? Nick? >>>> >>>> -- >>>> *N6OL* >>>> Saying something doesn't make it true. Belief in something doesn't make >>>> it real. And if you have to lie to support a position, that position is not >>>> worth supporting. >>>> >>> >>> >>> -- >>> *N6OL* >>> Saying something doesn't make it true. Belief in something doesn't make it >>> real. And if you have to lie to support a position, that position is not >>> worth supporting. >>> ______________________________________________________________ >>> 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] > > > ------------------------------ > > Message: 2 > Date: Tue, 3 Jan 2017 13:46:12 -0800 > From: Nicklas Johnson <[hidden email]> > To: Wayne Burdick <[hidden email]> > Cc: David Anderson <[hidden email]>, elecraft > <[hidden email]> > Subject: Re: [Elecraft] Audio artifacts in DATA A mode with KX3 > Message-ID: > <CA+ZptLnT3oQHLG=[hidden email]> > Content-Type: text/plain; charset=UTF-8 > > Thank you, Wayne! At least we know we're not crazy :-) > > Nick / N6OL > > On 3 January 2017 at 13:45, Wayne Burdick <[hidden email]> wrote: > >> This is on the KX3 firmware list. I'll move it up a notch. >> >> Wayne >> N6KR >> >> >> On Jan 3, 2017, at 12:16 AM, David Anderson via Elecraft < >> [hidden email]> wrote: >> >>> Nick, >>> >>> Thank you for bringing this up. >>> >>> I never did get a satisfactory explanation, I contacted support too but >> that didn't get me anywhere either, I don't think they understood my >> question, which is quite simple really, why can't we get the same bandwidth >> in Data mode as in SSB mode? I think it's a simple oversight, but nobody >> seemed interested in acknowledging it or fixing it. >>> >>> 73 from David GM4JJJ >>> >>>> On 2 Jan 2017, at 23:54, Nicklas Johnson <[hidden email]> wrote: >>>> >>>> J?rg in the Elecraft KX3 group on Facebook had an interesting >> observation: >>>> with WJST's waterfall, if the "flatten" mode is on, it produces some >>>> unusual artifacts in the presence of sharp spectrum drop-offs, and >> indeed >>>> if I turn off the "flatten" feature and manually set the zero point for >> the >>>> waterfall, the artifacts go away. >>>> >>>> It's still an open question as to why the data-a mode has a steep >> drop-off >>>> at 400Hz when the PBT settings on the rig would seem to indicate >> otherwise, >>>> and the same drop-off isn't there in USB mode. >>>> >>>> I see searching on "400 Hz" that GM4JJJ had the same question here on >> the >>>> last back in July 2015, but never really got an answer. I basically >> have >>>> the same question as this one: >>>> https://www.mail-archive.com/elecraft@.../msg183837.html >>>> >>>> Nick >>>> >>>> >>>>> On 2 January 2017 at 12:06, Nicklas Johnson <[hidden email]> wrote: >>>>> >>>>> I'm seeing some unexpected audio artifacts when using DATA A mode with >> the >>>>> latest production firmware on my KX3, on all bands. This is something >> I >>>>> observe when the PBT BW is set all the way wide (4KHz) and FC is >> centered. >>>>> In DATA mode, there's an audio drop-off between 200 and 325 Hz, with an >>>>> almost completely dead audio "hole" between 250 and 300 Hz. Then >> there's >>>>> some additional noise between 350 and 500 Hz. >>>>> >>>>> If I switch to USB mode (with no EQ or audio effects applied, >> naturally), >>>>> all of these artifacts go away, and it's perfectly smooth across the >>>>> spectrum. No drop-off, no noise. >>>>> >>>>> Pictures of the waterfalls for comparison here: >> http://imgur.com/a/AjHu4 >>>>> Am I doing something wrong, or is there something I should check? I've >>>>> taken the usual steps, but it's plausible I've missed something. >>>>> >>>>> ? Nick? >>>>> >>>>> -- >>>>> *N6OL* >>>>> Saying something doesn't make it true. Belief in something doesn't >> make >>>>> it real. And if you have to lie to support a position, that position >> is not >>>>> worth supporting. >>>>> >>>> >>>> >>>> -- >>>> *N6OL* >>>> Saying something doesn't make it true. Belief in something doesn't >> make it >>>> real. And if you have to lie to support a position, that position is not >>>> worth supporting. >>>> ______________________________________________________________ >>>> 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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Mike is checking it out, but there's an 8.2 MHz trap on the ATU board,
or on the KAT3 if you have no ATU. It's the prime suspect. Scott K9MA On 1/4/2017 17:40, Jim Spaulding wrote: > Mike and Jim > > I am having the same problem on 40 M only with one of two K3s. Both > have new synth boards and antenna tuners bypassed. > > Jim W0UO -- Scott K9MA [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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