K3 Rev C DSP with Low Freq Enhancement ship date info; New swap out option on parts order page.
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> I think what some folks are requesting is an updated schematic...
Approximately every October I gather the latest schematics and integrate them into a PDF document which we post on the website. The original schematic set was Oct 2007, the present set is Oct 2008. When I return from vacation, I'll be gathering the information again for a new schematic release in October or November. 73, Lyle KK7P/7 (Tucson AZ) ______________________________________________________________ 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 |
Re: K3 Rev C DSP with Low Freq Enhancement
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Is there any chance of a list of changes that aren't published as mods?
On Sat, 2009-10-10 at 22:15 -0700, lyle johnson wrote: > > I think what some folks are requesting is an updated schematic... > > Approximately every October I gather the latest schematics and integrate them > into a PDF document which we post on the website. The original schematic set > was Oct 2007, the present set is Oct 2008. When I return from vacation, I'll > be gathering the information again for a new schematic release in October or > November. > > 73, > > Lyle KK7P/7 (Tucson AZ) > ______________________________________________________________ > 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 ______________________________________________________________ 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 |
Re: K3 Rev C DSP with Low Freq Enhancement
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In reply to this post by P.B. Christensen
But since the capacitor values are all being increased, is it not an option simply to add conventional electrolytic capacitors in parallel to the SMT ones, as the photos on the Russian website appear to illustrate? That is something most people would be capable of doing, and could be especially attractive to those of us in Europe for whom the total cost of the board swap will amount to a lot more than $65.
Julian, G4ILO. K2 #392 K3 #222 KX3 #110
* G4ILO's Shack - http://www.g4ilo.com * KComm - http://www.g4ilo.com/kcomm.html * KTune - http://www.g4ilo.com/ktune.html |
Re: K3 Rev C DSP with Low Freq Enhancement
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> But since the capacitor values are all being increased, is it not an
> option > simply to add conventional electrolytic capacitors in parallel to the SMT > ones, as the photos on the Russian website appear to illustrate? I don't know what he has done, but it's possible to stack SMT capacitors if great care is taken. This will work for the line-in and mic-in changes, but I cannot see how stacking C9/C13 will work for the headphone output change. If he's accomplished that task, God bless him. Myself, I've found it takes a great balancing act to stack SMT parts and hold the new component in place. I'm not the world's best SMT re-work guy, so others may have developed better eye-hand coordination skills. Paul, W9AC ______________________________________________________________ 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 |
Re: K3 Rev C DSP with Low Freq Enhancement
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In reply to this post by Julian, G4ILO
> But since the capacitor values are all being increased, is it > not an option simply to add conventional electrolytic > capacitors in parallel to the SMT ones, as the photos on the > Russian website appear to illustrate? The changes on the Russian web site are not "official" from Elecraft. Other than the changes to the headphone coupling capacitors, the changes on that web site involve mostly adding large electrolytic capacitors as additional bypassing and decoupling to supply lines or internal voltage references in amplifiers. Most of the changes are not related to audio response. 73, ... Joe, W4TV > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Julian, G4ILO > Sent: Sunday, October 11, 2009 6:44 AM > To: [hidden email] > Subject: Re: [Elecraft] [K3] K3 Rev C DSP with Low Freq Enhancement > > > > > > P.B. Christensen wrote: > > > > I think what some folks are requesting is an updated schematic, > > showing the new values. But what they may not realize is > that 7 SMT > > capacitors are changed -- or in the alternative, the > corresponding SMT > > resistors require solder re-work and that's in addition to > the C9/C13 > > change and so the total > > parts change may be in excess of 10. That's a lot of propensity for > > damage > > to the board and it really makes sense to just opt for the > board swap > > through Elecraft. > > > > > But since the capacitor values are all being increased, is it > not an option simply to add conventional electrolytic > capacitors in parallel to the SMT ones, as the photos on the > Russian website appear to illustrate? That is something most > people would be capable of doing, and could be especially > attractive to those of us in Europe for whom the total cost > of the board swap will amount to a lot more than $65. > > ----- > Julian, G4ILO. K2 #392 K3 #222. > * G4ILO's Shack - http://www.g4ilo.com > * KComm - http://www.g4ilo.com/kcomm.html > * KTune - http://www.g4ilo.com/ktune.html > > -- > View this message in context: > http://n2.nabble.com/K3-Rev-C-DSP-with-Low-Freq-Enhancement-sh Sent from the [K3] 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 ______________________________________________________________ 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 |
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In reply to this post by P.B. Christensen
Paul Christensen wrote:
> Take a look at what's happening before the ADC and after the DAC circuits. > The K3 has some of the best designed audio circuits for a communications > transceiver. > > Paul, W9AC > > Unfortunately, the issue with the 12 kHz leakage (DAC clock?) and beat notes (+/- CW sidetone around 12 kHz) make for some awful audio in CW. I guess most folks don't hear it, but given previous reports from others, it is an issue. I can't comfortably use the K3 for CW unless using outboard low-pass audio filters to knock the high end garbage down to an in-audible level. 73 Eric NO3M ______________________________________________________________ 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 |
Re: K3 Rev C DSP with Low Freq Enhancement
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Whatever happened to the filter being tested by Elecraft which was
described in this post: http://marc.info/?l=elecraft&m=124561590925425&w=2 Bob NW8L On Tue, Oct 13, 2009 at 1:37 AM, Eric Tichansky <[hidden email]> wrote: > Unfortunately, the issue with the 12 kHz leakage (DAC clock?) and beat > notes (+/- CW sidetone around 12 kHz) make for some awful audio in CW. > I guess most folks don't hear it, but given previous reports from > others, it is an issue. I can't comfortably use the K3 for CW unless > using outboard low-pass audio filters to knock the high end garbage down > to an in-audible level. > > 73 > Eric NO3M ______________________________________________________________ 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 |
Re: K3 Rev C DSP with Low Freq Enhancement
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In reply to this post by Eric NO3M
I believe the add-on LPF module for the DSP board will be available
soon. We'll post details at that time. It's easy to install. The rolloff of this module is 4.5 kHz, and it completely eliminates all high-frequency artifacts resulting from the CODEC's 12-kHz sample rate. I can't hear the artifacts, which are typically 60 dB down from even weak audio signals, but some operators with better ears apparently can. 73, Wayne N6KR On Oct 13, 2009, at 12:37 AM, Eric Tichansky wrote: > Paul Christensen wrote: >> Take a look at what's happening before the ADC and after the DAC >> circuits. >> The K3 has some of the best designed audio circuits for a >> communications >> transceiver. >> >> Paul, W9AC >> >> > Unfortunately, the issue with the 12 kHz leakage (DAC clock?) and beat > notes (+/- CW sidetone around 12 kHz) make for some awful audio in CW. > I guess most folks don't hear it, but given previous reports from > others, it is an issue. I can't comfortably use the K3 for CW unless > using outboard low-pass audio filters to knock the high end garbage > down > to an in-audible level. > > 73 > Eric NO3M > ______________________________________________________________ > 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 ______________________________________________________________ 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 |
Re: K3 Rev C DSP with Low Freq Enhancement
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G'day,
Would this module be available already fitted to a swap out DSP board? Regards, Mike VP8NO ----- Original Message ----- From: "Wayne Burdick" <[hidden email]> To: <[hidden email]> Cc: <[hidden email]> Sent: Tuesday, October 13, 2009 2:31 PM Subject: Re: [Elecraft] K3 Rev C DSP with Low Freq Enhancement >I believe the add-on LPF module for the DSP board will be available > soon. We'll post details at that time. It's easy to install. > > The rolloff of this module is 4.5 kHz, and it completely > eliminates > all high-frequency artifacts resulting from the CODEC's 12-kHz > sample > rate. > > I can't hear the artifacts, which are typically 60 dB down from > even > weak audio signals, but some operators with better ears apparently > can. > > 73, > Wayne > N6KR ______________________________________________________________ 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 |
Re: K3 Rev C DSP with Low Freq Enhancement
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In reply to this post by Eric NO3M
I have installed the beta version of the Low Pass filter board. It turned my
K3 into a whole different radio. I had been experiencing audio fatigue to the point I just stopped using the K3 for CW. I know Paul says the audio is one of the best designed audio circuits for a communications receiver. I say it is now but not before. I may have had a singular issue with my K3 or I have a singular set of ears. Mike Scott - AE6WA Tarzana, CA (DM04 / near LA) NAQCC 3535 K3-100 #508 / KX1 #1311 > Unfortunately, the issue with the 12 kHz leakage (DAC clock?) and beat > notes (+/- CW sidetone around 12 kHz) make for some awful audio in CW. > I guess most folks don't hear it, but given previous reports from > others, it is an issue. I can't comfortably use the K3 for CW unless > using outboard low-pass audio filters to knock the high end garbage > down > to an in-audible level. > > 73 > Eric NO3M ______________________________________________________________ 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 |
Re: K3 Rev C DSP with Low Freq Enhancement
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Wished I had a set of ears like yours.
12 KHz alias signals measure 65 dB down from CW beat note in my K3 while 3rd harmonic is 55 dB down. 73 Juan EA5RS
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Re: K3 Rev C DSP with Low Freq Enhancement
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In reply to this post by Eric NO3M
>Wished I had a set of ears like yours.
12 KHz alias signals measure 65 dB down from CW beat note in my K3 while 3rd harmonic is 55 dB down. Juan, I think your 3rd harmonic measurement is the key. If you research audio fatigue you may find that odd harmonics are particularly troublesome and that they can cause audio fatigue even when the level is below what you might consider audible. My ears are not that good, ask my wife... I wear a hearing aid in my left ear. I just may more susceptible to audio fatigue than the next guy. Mike Scott - AE6WA Tarzana, CA (DM04 / near LA) NAQCC 3535 K3-100 #508 / KX1 #1311 ______________________________________________________________ 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 |
Re: K3 Rev C DSP with Low Freq Enhancement
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> Juan, I think your 3rd harmonic measurement is the key. If you research
> audio fatigue you may find that odd harmonics are particularly troublesome > and that they can cause audio fatigue even when the level is below what > you > might consider audible. Mike, There may be several variables occurring here. When I get back from a conference, I plan on making my own FFT measurements at the H/P jack regarding this effect. It's possible that the intensity of distortion artifacts as measured by Jack Smith, and presumably what you're hearing, may be different among K3 samples. Myself, I don't hear anything that brings about fatigue under any operating conditions. Also, Rx audio response capabilities with the latest K3 firmware has evolved and additional low-end content is present that was not there in previous releases. And so, one has to consider whether it was the change in firmware -- or the beta LPF board that is now responsible for the changes you're now hearing. I have to believe that with some ops, the perception of fatigue is related to a previous lack of low-end to presence-band balance. More than anything, what brings fatigue to me is extended listening through a narrow audio passband. Paul, W9AC ______________________________________________________________ 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 |
Re: K3 Rev C DSP with Low Freq Enhancement
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In reply to this post by KK7P
Lyle,
What is the status, will there be a 2009 schematic? 73 Jan SM6TUW
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Re: K3 Rev C DSP with Low Freq Enhancement
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See:
http://n2.nabble.com/K3-skematics-td4021941.html#a4021941 ~Iain / N6ML On Mon, Nov 23, 2009 at 11:37 PM, Jan Holmer SM6TUW <[hidden email]> wrote: > > Lyle, > > What is the status, will there be a 2009 schematic? > > 73 > > Jan SM6TUW > > > KK7P wrote: >> >>> I think what some folks are requesting is an updated schematic... >> >> Approximately every October I gather the latest schematics and integrate >> them >> into a PDF document which we post on the website. The original schematic >> set >> was Oct 2007, the present set is Oct 2008. When I return from vacation, >> I'll >> be gathering the information again for a new schematic release in October >> or >> November. >> >> 73, >> >> Lyle KK7P/7 (Tucson AZ) >> ______________________________________________________________ >> 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 >> >> > > -- > View this message in context: http://n2.nabble.com/K3-Rev-C-DSP-with-Low-Freq-Enhancement-ship-date-info-New-swap-out-option-on-parts-order-page-tp3789876p4056289.html > Sent from the [K3] 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 > 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 |
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