K3 RF feedback
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When Don wrote the paragraph quoted below, I started to think
why I would want to use one of these modes. AM doesn't seem very likely except as a demo. But ESSB might be useful to transmit a wide-band, high bit rate digital mode via a computer sound card. Those sound cards have at least 15KHz bandwidth, which would need to be reflected in the transmitter (and receiver) bandwidths. That amount of spectrum would be reasonable in bands where FM is commonly used. I find the regulations for 160M-10M confusing as to the maximum bit rate* and bandwidth permitted, but on 6 meters, the authorized bandwidth is up to 20 kHz with a maximum baud rate of 19.2K baud/second. Cheers - Bill, AE6JV * The regulations speak in terms of maximum baud rate, but you can send more than one bit/baud, if you have enough bandwidth. On 9/22/12 at 18:19, [hidden email] (Don Wilhelm) wrote: >I too would like to see the FM filter also usable for AM and >ESSB. I really never anticipate transmitting in AM or ESSB, >there is always the possibility I would like to use it for some >demo sessions showing off the K3 capabilities. The >cost/benefit ratio is too high for that kind of occasional application. --------------------------------------------------------------------------- Bill Frantz |"Web security is like medicine - trying to do good for 408-356-8506 |an evolved body of kludges" - Mark Miller www.pwpconsult.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 |
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In reply to this post by AC6JA
That's right, Fred and Mike - This is exactly what I have been mentioning ever since I got my KPA500 a year ago. It only occurs when BND CHG is set to STBY, which I think is safer. Elecraft was able to reproduce it and said it would be corrected in a future release. The bug is supposed to be on the K3 side.
IMHO, this is important to all, rather than AM (seldom used) and ESSB (I'd never do that!) 73 Richard - HB9ANM
Richard - HB9ANM
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*Same here on #679 and has been like it for a year or more I think?
the fix is to run OPER all the time which is not helpful if you need to use a tuner...:-) 73 * On 23 September 2012 18:23, Richard Squire - HB9ANM <[hidden email]>wrote: > That's right, Fred and Mike - This is exactly what I have been mentioning > ever since I got my KPA500 a year ago. It only occurs when BND CHG is set > to > STBY, which I think is safer. Elecraft was able to reproduce it and said it > would be corrected in a future release. The bug is supposed to be on the K3 > side. > IMHO, this is important to all, rather than AM (seldom used) and ESSB (I'd > never do that!) > > 73 > Richard - HB9ANM > > > AC6JA wrote > > Fred, > > There is a known firmware issue which causes the K3 to sometimes "forget" > > to go back to 100W when switching the KPA500 from OPER to STBY. > > Mine has the same issue where I need to periodically reset the K3 PWR > back > > up to 100W when operating the KPA500 in STBY. So far the K3 remembers to > > go to the preset PWR output levels when the KPA500 is in OPER. > > Elecraft is supposed to address this issue in a future firmware release. > > > > Mike AC6JA > > > > > > > > ----- > Richard - HB9ANM > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/K3-RF-feedback-tp7561833p7563149.html > Sent from the Elecraft 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 > -- *Gary* *Start the day off slow, then taper off.........* K3 #679 KPA500FT #18 KAT500FT 007 P3 #1629 ______________________________________________________________ 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 Bob Cunnings NW8L
Yes, Bob. This is a very accurate description of the problem.
Richard - HB9ANM
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In reply to this post by Gary Gregory
So if this is a known issue that's been present for a year in the life of a new product, one claim of which is tight integration into a chain of products, what's the expected time frame to resolution? I just bought a KPA500 precisely because of this integration but I see now I'll face this problem, because I run a manual tuner.
Hopefully they're on to it for the next release. John VK7JB |
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Don't worry, John, you can still use the K3 buttons as usual to change bands, but I would still recommend setting BND CHG to STBY on the KPA500 for safety if you are using a manual tuner.
Glad to see the issue is now receiving so much feedback! A word in Wayne's ear before Eric has to end the thread, hi! 73 Richard HB9ANM
Richard - HB9ANM
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In reply to this post by Bill Frantz
> ESSB might be useful to transmit a wide-band, high bit rate > digital mode via a computer sound card. Those sound cards have > at least 15KHz bandwidth, ESSB is limited to 4.0 KHz but is not available in digital modes (DATA A or AFSK A). While ESSB might be useful for those modes in which "panoramic" (click in a 2.5 to 3 KHz wide waterfall) operation is the norm, nearly every transmitter has an "in band" noise pedestal (broadband noise) the width of the transmit filter that is only 60 to 80 dB below the transmitter's PEP output. By the way, in the K3 when the ALC is adjusted for 4-5 bars and the PWR control reduced to 25 watts or so for PSK31, that noise pedestal is 80 dB relative to 25 watts In the conventional rigs where the power control is run "wide open" and the audio drive (mic gain) set for no ALC, that noise pedestal is 60 to 80 dB below the *FULL POWER* level as the IF stages run wide open providing maximum amplification of the broadband noise. 73, ... Joe, W4TV On 9/23/2012 2:13 AM, Bill Frantz wrote: > When Don wrote the paragraph quoted below, I started to think > why I would want to use one of these modes. AM doesn't seem very > likely except as a demo. > > But ESSB might be useful to transmit a wide-band, high bit rate > digital mode via a computer sound card. Those sound cards have > at least 15KHz bandwidth, which would need to be reflected in > the transmitter (and receiver) bandwidths. That amount of > spectrum would be reasonable in bands where FM is commonly used. > > I find the regulations for 160M-10M confusing as to the maximum > bit rate* and bandwidth permitted, but on 6 meters, the > authorized bandwidth is up to 20 kHz with a maximum baud rate of > 19.2K baud/second. > > Cheers - Bill, AE6JV > > * The regulations speak in terms of maximum baud rate, but you > can send more than one bit/baud, if you have enough bandwidth. > > On 9/22/12 at 18:19, [hidden email] (Don Wilhelm) wrote: > >> I too would like to see the FM filter also usable for AM and >> ESSB. I really never anticipate transmitting in AM or ESSB, >> there is always the possibility I would like to use it for some >> demo sessions showing off the K3 capabilities. The >> cost/benefit ratio is too high for that kind of occasional application. > > --------------------------------------------------------------------------- > Bill Frantz |"Web security is like medicine - trying to > do good for > 408-356-8506 |an evolved body of kludges" - Mark Miller > www.pwpconsult.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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I am digging to the bottom of the barrel for reasons to have a
broad transmit bandwidth. I don't think the high speed digital mode I'm thinking about has yet been invented, but one of the purposes of amateur radio is to expriment with new modes. I see such a mode as being useful for meteor trail scatter propagation. I think you could send an entire exchange segment (called station, signal report, and transmitting station) in under 10 milliseconds. That speed would allow several QSOs during the 1-3 second lifespan of the ionization. With forward error correction in the protocol, the software could calculate the signal report based on the number of wrong bits received and the signal strength, the 5 and the 9 of a conventional SSB report. With the mode filling the whole bandwidth ala PSK31 filling the 31 Hz bandwidth, I don't think the 80 dB noise pedestal is a significant factor. But I certainly could be wrong. (It wouldn't be the first time.) As a rag chewer at heart, that kind of QSO isn't quite my cup of tea, but it might appeal to the people who enjoy WSJT moon bounce. Amateur radio is a very big tent. Cheers - Bill, AE6JV On 9/23/12 at 7:47, [hidden email] (Joe Subich, W4TV) wrote: >>ESSB might be useful to transmit a wide-band, high bit rate >>digital mode via a computer sound card. Those sound cards have >>at least 15KHz bandwidth, > >ESSB is limited to 4.0 KHz but is not available in digital modes >(DATA A or AFSK A). While ESSB might be useful for those modes in >which "panoramic" (click in a 2.5 to 3 KHz wide waterfall) operation >is the norm, nearly every transmitter has an "in band" noise pedestal >(broadband noise) the width of the transmit filter that is only 60 >to 80 dB below the transmitter's PEP output. --------------------------------------------------------------------------- Bill Frantz |"Web security is like medicine - trying to do good for 408-356-8506 |an evolved body of kludges" - Mark Miller www.pwpconsult.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 |
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In reply to this post by wayne burdick
Don't we already have the option to beta the feature to use the FM filter for AM via macro's. I'm not sure which way to spin the VFO dial for the band width selection, but the macro seems simple enough to build.
To set to AM with the filter set to 13Khz and needing to go to 6Khz: MN038; FLx BW SWT11; press [1] UP; run the vfo dial to the setting for a narrower filter (might be down I'm not at the rig) MD5; Set the rig to AM mode MN255; exit the menu FM Mode: MN038; FLx BW SWT11; press [1] DN; run the vfo dial to the setting for a narrower filter (might be up I'm not at the rig) MD4; Set the rig to FM mode MN255; exit the menu So, anyone that wants to beta the feature just needs to build a couple of macro's? I did not read the whole thread, but this seems obvious. I'll try it tonight. |
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In reply to this post by wayne burdick
Hi Elecraft,
When can we expect a new firmware for testing? regards, ________________________________ From: Wayne Burdick <[hidden email]> To: Gordan Hribar <[hidden email]> Cc: Elecraft Reflector <[hidden email]> Sent: Friday, September 21, 2012 5:11 PM Subject: Re: [Elecraft] New beta K3 firmware! > Can I ask ELECRAFT what's next on the list for the K3 firmware improvements we can expect... Hi Gordan, Best guess: - improved CW decode at all AGC settings - support for KAT500 antenna switching from the K3 - bug fixes related to remote rig communications (K3/0) There have also been many requests for minor changes, some of which I'll be adding. I can't say yet which ones will make the next cut. 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 |
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