K3 Audio Pops
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I used my K3 for the first time in a really serious contest for SS
CW. The performance was astounding. This is the first receiver I have EVER had that would let me put a S9 +40dB signal just on the edge of the filter and then copy signals in the filter passband clear down to the noise floor with no problem at all. However, I did notice at times that there were a good many loud "pops" that appeared in the audio, seemingly at random. These pops were really LOUD, but fortunately very brief (maybe just a few milliseconds in duration). Since the pops were so much louder than the normal audio, I can't say for sure that their level changed with the audio gain setting. They sounded to me like DSP artifacts, as if the audio D/A was being driven to the top of its range for short periods. I wasn't able to really correlate these pops with anything I was hearing within in the receiver passband. During one run period on 40 meters the pops were especially frequent, coming every few seconds. Probably not coincidentally there was a nearby station who had some rather prominent key clicks, and I'm guessing the combination of his key clicks and local QRN spikes were aggravating whatever mechanism is responsible for the pop generation. The pops were encountered in "plain vanilla" receive mode, no NB or NR and mostly with the default 400 Hz DSP bandwidth behind an 8-pole 400 Hz 1st IF filter, QSK on. I'm running the latest public beta firmware (MCU 3.52, DSP 2.43). If it makes any difference, I do have my radio set to select the 400 Hz roofing filter when the BW is dialed to 500 Hz rather than the default 400 Hz. I heard the pops using either of two kinds of high impedance headphones, Sony MD-7506 (63 Ohms) and Extreme Isolation EX-29 (32 Ohms). Has anyone else encountered this phenomenon? 73... Randy, W8FN ______________________________________________________________ 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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Administrator
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You need rev 3.57, presently in field test.
73, Wayne N6KR ---- http://www.elecraft.com On Nov 10, 2009, at 7:04 AM, Randy Farmer <[hidden email]> wrote: > I used my K3 for the first time in a really serious contest for SS > CW. The performance was astounding. This is the first receiver I have > EVER had that would let me put a S9 +40dB signal just on the edge of > the filter and then copy signals in the filter passband clear down to > the noise floor with no problem at all. > > However, I did notice at times that there were a good many loud > "pops" that appeared in the audio, seemingly at random. These pops > were really LOUD, but fortunately very brief (maybe just a few > milliseconds in duration).... 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 w8fn
Randy
Experienced the same symptoms in SS CW. Random intermittent loud pops with no NB/NR on. Never did figure it out but a bit of RF gain adjust seemed to help. It does wake you up if you have the AF gain high. Steve, N8BJQ ______________________________________________________________ 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
In the release notes of rev. 3.57 there is no indication that this issue is solved. What is the real status now ??? I am still at 2.76 just because I want to be sure my hearing ability won't be destroyed by the audio blast issue. On the other hand I am missing out on all the goodies implemented in the meanwhile ... What is wisdom here ?
-- Enno, PF5X
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Re: K3 Audio Blast <> F/W rev 3.57
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Enno,
Look at the release notes for 3.30 and you will see reference to the audio blast. Sorry you missed it. 73, Don W3FPR Enno, PF5X wrote: > In the release notes of rev. 3.57 there is no indication that this issue is > solved. What is the real status now ??? I am still at 2.76 just because I > want to be sure my hearing ability won't be destroyed by the audio blast > issue. On the other hand I am missing out on all the goodies implemented in > the meanwhile ... What is wisdom here ? > > -- Enno, PF5X > > ______________________________________________________________ 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 Audio Blast <> F/W rev 3.57
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Hi Don,
Thanks for the prompt reaction. No, I did not miss the the release notes for 3.30. However, recently audio blasts and audio pops are still being reported in 3.52 (check the first mails in this chain + an older posting of Oct 31). Wayne responded that it will be fixed in 3.57, but, as said, there is no remark in the 3.57 release notes on that. So, my concern still remains ... -- Enno
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Re: K3 Audio Blast <> F/W rev 3.57
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Administrator
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In reply to this post by Enno, PF5X
This has been dealt with incrementally over the past several beta
releases, and is now fixed. Assuming there are no further reports, we'll be promoting 3.57 to "production" status. Thanks for your patience! 73, Wayne N6KR ---- http://www.elecraft.com On Nov 11, 2009, at 4:38 AM, "Enno, PF5X" <[hidden email]> wrote: > > In the release notes of rev. 3.57 there is no indication that this > issue is > solved. What is the real status now ??? I am still at 2.76 just > because I > want to be sure my hearing ability won't be destroyed by the audio > blast > issue. On the other hand I am missing out on all the goodies > implemented in > the meanwhile ... What is wisdom here ? > > -- Enno, PF5X > > > > wayne burdick wrote: >> >> You need rev 3.57, presently in field test. >> >> 73, >> Wayne >> N6KR >> >> ---- >> http://www.elecraft.com >> >> On Nov 10, 2009, at 7:04 AM, Randy Farmer <[hidden email]> wrote: >> >>> I used my K3 for the first time in a really serious contest for SS >>> CW. The performance was astounding. This is the first receiver I >>> have >>> EVER had that would let me put a S9 +40dB signal just on the edge of >>> the filter and then copy signals in the filter passband clear down >>> to >>> the noise floor with no problem at all. >>> >>> However, I did notice at times that there were a good many loud >>> "pops" that appeared in the audio, seemingly at random. These pops >>> were really LOUD, but fortunately very brief (maybe just a few >>> milliseconds in duration).... >> ______________________________________________________________ >> 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-Audio-Pops-tp3980205p3986162.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 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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