Re: [Elecraft] K2 scratchy noise on RX CW signals
Andrew, Bypass is not "OFF", so yes it could still be in-circuit. The only way to really find out is to re-install it and set everything to default. A good exercise for a rainy/snowy afternoon. 73, Don W3FPR On 2/19/2022 9:04 PM, Andrew Moore wrote: Hi Don - thanks for the suggestion. Any idea if the scratchy audio would persist if the KDSP2 was put into bypass mode? I tried that and scratchy audio was still there. Thanks, -Andrew On Sat, Feb 19, 2022 at 8:49 PM Don Wilhelm wrote: Andrew, That sounds like you had the NB and/or NR set on in the KDSP2 with aggressive settings. If the settings were aggressive, it would give you 'scratchy' audio - but it does eliminate other unwanted signal sounds. You might want to put the KDSP2 in again and try several settings - see the KDSP2 manual. Start with all settings at default and go from there. 73, Don W3FPR On 2/17/2022 3:55 PM, Andrew Moore wrote: > I replaced the KDSP2 with a newly built KAF2 today and am happy to report > the noise is gone. Not sure if the board swap had anything to do with it, > but everything sounds great now and hope that continues. > > Thanks, > -Andrew / NV1B > __ 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] K2 scratchy noise on RX CW signals
Thanks Don - I might just do that. I hadn't checked the settings before I removed the board. Good to know. In the meantime the KAT2 runs great. On Sat, Feb 19, 2022 at 9:30 PM Don Wilhelm wrote: > Andrew, > > Bypass is not "OFF", so yes it could still be in-circuit. > The only way to really find out is to re-install it and set everything > to default. > A good exercise for a rainy/snowy afternoon. > > 73, > Don W3FPR > > On 2/19/2022 9:04 PM, Andrew Moore wrote: > > Hi Don - thanks for the suggestion. Any idea if the scratchy audio > > would persist if the KDSP2 was put into bypass mode? I tried that and > > scratchy audio was still there. > > > > Thanks, > > -Andrew > > > > > > On Sat, Feb 19, 2022 at 8:49 PM Don Wilhelm wrote: > > > > Andrew, > > > > That sounds like you had the NB and/or NR set on in the KDSP2 with > > aggressive settings. > > If the settings were aggressive, it would give you 'scratchy' audio - > > but it does eliminate other unwanted signal sounds. You might > > want to > > put the KDSP2 in again and try several settings - see the KDSP2 > > manual. > > Start with all settings at default and go from there. > > > > 73, > > Don W3FPR > > > > On 2/17/2022 3:55 PM, Andrew Moore wrote: > > > I replaced the KDSP2 with a newly built KAF2 today and am happy > > to report > > > the noise is gone. Not sure if the board swap had anything to do > > with it, > > > but everything sounds great now and hope that continues. > > > > > > Thanks, > > > -Andrew / NV1B > > > > > > > __ 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] K2 scratchy noise on RX CW signals
Hi Don - thanks for the suggestion. Any idea if the scratchy audio would persist if the KDSP2 was put into bypass mode? I tried that and scratchy audio was still there. Thanks, -Andrew On Sat, Feb 19, 2022 at 8:49 PM Don Wilhelm wrote: > Andrew, > > That sounds like you had the NB and/or NR set on in the KDSP2 with > aggressive settings. > If the settings were aggressive, it would give you 'scratchy' audio - > but it does eliminate other unwanted signal sounds. You might want to > put the KDSP2 in again and try several settings - see the KDSP2 manual. > Start with all settings at default and go from there. > > 73, > Don W3FPR > > On 2/17/2022 3:55 PM, Andrew Moore wrote: > > I replaced the KDSP2 with a newly built KAF2 today and am happy to report > > the noise is gone. Not sure if the board swap had anything to do with it, > > but everything sounds great now and hope that continues. > > > > Thanks, > > -Andrew / NV1B > > > > __ 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] K2 scratchy noise on RX CW signals
Andrew, That sounds like you had the NB and/or NR set on in the KDSP2 with aggressive settings. If the settings were aggressive, it would give you 'scratchy' audio - but it does eliminate other unwanted signal sounds. You might want to put the KDSP2 in again and try several settings - see the KDSP2 manual. Start with all settings at default and go from there. 73, Don W3FPR On 2/17/2022 3:55 PM, Andrew Moore wrote: I replaced the KDSP2 with a newly built KAF2 today and am happy to report the noise is gone. Not sure if the board swap had anything to do with it, but everything sounds great now and hope that continues. Thanks, -Andrew / NV1B __ 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] K2 scratchy noise on RX CW signals
I replaced the KDSP2 with a newly built KAF2 today and am happy to report the noise is gone. Not sure if the board swap had anything to do with it, but everything sounds great now and hope that continues. Thanks, -Andrew / NV1B .. On Wed, Feb 16, 2022 at 10:08 PM Andrew Moore wrote: > Hi Elecrafters - > > Today I took delivery of K2 #892 and very happy to have it in the shack > after selling my #4958, I think it was, years ago... if anyone has it I'd > like it back please). This #892 has a "static sounding" scratchy/raspy > noise on top of CW signals. It sounds similar to what you'd hear from an > oxidized audio frequency pot. The strength and presence of the noise is > proportional to the incoming CW signal strength. > > The rig is running from a clean, large high current capacity battery so > I'm sure the supply power is good. The noise occurs across multiple bands. > I get the sense it's something in the audio chain. The installed KDSP2 > digital audio filter has already been put in bypass mode and the scratchies > persist. > > Before I continue debugging I wanted to see if anyone had suggestions > about what components to target. > > Thanks, > -Andrew / NV1B > .. > > > __ 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
