K3: KPA100 Squeal
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First off it was a great Field Day and my new K3 impressed me extremely not only in performance but in it's functionality.
To kick off Field Day I installed a new KPA100 into the K3. I did all the necessary TX gain calibrations using a dummy load. One thing I noticed immediately was that I was hearing a very high pitched squeal coming from either the PA board or possibly the KIO3 (the board the amp plugs into). The squeal seems to vary in frequency each time the transmitter keys up (can only hear it when the radio is in TX). The squeal is not very loud but its loud enough for me to hear it if I listen closely. It doesn't seem to be power related. The squeal is there even if the radio is in TX but no power going out (RF Pwr set to 0W). The closest thing I can compare the sound to is perhaps a tiny leak in an air hose. Is this typical of a bad solder joint or something? This squeal only pertains to the new KPA100 installation. Before the amp was installed I didn't hear a thing. I should also note that nothing appears to be affecting performance. Puts out 100 watts no problem. Clean modulation, etc. -------------- Geoffrey Wolf AB3LS (Amateur Radio Callsign) University of Pittsburgh '14 [hidden email] [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
Geoffrey Wolf
AB3LS University of Pittsburgh '14 grw20@pitt.edu liltechdude13@gmail.com http://www.ab3ls.com |
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I have very similar symptoms in my K3/100 (SN 5284) that I assembled in
March. It makes the sound even if I am in TX test mode. Again, no performance issues, just a slightly bothersome squeal / whine. On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey Wolf <[hidden email]>wrote: > First off it was a great Field Day and my new K3 impressed me extremely not > only in performance but in it's functionality. > > To kick off Field Day I installed a new KPA100 into the K3. I did all the > necessary TX gain calibrations using a dummy load. > > One thing I noticed immediately was that I was hearing a very high pitched > squeal coming from either the PA board or possibly the KIO3 (the board the > amp plugs into). The squeal seems to vary in frequency each time the > transmitter keys up (can only hear it when the radio is in TX). The squeal > is not very loud but its loud enough for me to hear it if I listen closely. > It doesn't seem to be power related. The squeal is there even if the radio > is in TX but no power going out (RF Pwr set to 0W). The closest thing I can > compare the sound to is perhaps a tiny leak in an air hose. Is this typical > of a bad solder joint or something? > > This squeal only pertains to the new KPA100 installation. Before the amp > was installed I didn't hear a thing. > > I should also note that nothing appears to be affecting performance. Puts > out 100 watts no problem. Clean modulation, etc. > > -------------- > Geoffrey Wolf > AB3LS (Amateur Radio Callsign) > University of Pittsburgh '14 > [hidden email] > [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 > -- Joe Harris, N1QD ______________________________________________________________ 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 have the same thing happening, similar series K3 (5k something) , also assembled in March.
Adi 2E0TTX On 27/06/2011 13:38, Joe Harris wrote: > I have very similar symptoms in my K3/100 (SN 5284) that I assembled in > March. It makes the sound even if I am in TX test mode. Again, no > performance issues, just a slightly bothersome squeal / whine. > > > > On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey Wolf<[hidden email]>wrote: > >> First off it was a great Field Day and my new K3 impressed me extremely not >> only in performance but in it's functionality. >> >> To kick off Field Day I installed a new KPA100 into the K3. I did all the >> necessary TX gain calibrations using a dummy load. >> >> One thing I noticed immediately was that I was hearing a very high pitched >> squeal coming from either the PA board or possibly the KIO3 (the board the >> amp plugs into). The squeal seems to vary in frequency each time the >> transmitter keys up (can only hear it when the radio is in TX). The squeal >> is not very loud but its loud enough for me to hear it if I listen closely. >> It doesn't seem to be power related. The squeal is there even if the radio >> is in TX but no power going out (RF Pwr set to 0W). The closest thing I can >> compare the sound to is perhaps a tiny leak in an air hose. Is this typical >> of a bad solder joint or something? >> >> This squeal only pertains to the new KPA100 installation. Before the amp >> was installed I didn't hear a thing. >> >> I should also note that nothing appears to be affecting performance. Puts >> out 100 watts no problem. Clean modulation, etc. >> >> -------------- >> Geoffrey Wolf >> AB3LS (Amateur Radio Callsign) >> University of Pittsburgh '14 >> [hidden email] >> [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 >> > > 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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Check to make sure that the cables routed in front of the fans are not
touching. A light touch will result in a sound like that. It will change or go away with the fan speed. 73, Guy. On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei <[hidden email]> wrote: > I have the same thing happening, similar series K3 (5k something) , also assembled in March. > > Adi > 2E0TTX > > > On 27/06/2011 13:38, Joe Harris wrote: >> I have very similar symptoms in my K3/100 (SN 5284) that I assembled in >> March. It makes the sound even if I am in TX test mode. Again, no >> performance issues, just a slightly bothersome squeal / whine. >> >> >> >> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey Wolf<[hidden email]>wrote: >> >>> First off it was a great Field Day and my new K3 impressed me extremely not >>> only in performance but in it's functionality. >>> >>> To kick off Field Day I installed a new KPA100 into the K3. I did all the >>> necessary TX gain calibrations using a dummy load. >>> >>> One thing I noticed immediately was that I was hearing a very high pitched >>> squeal coming from either the PA board or possibly the KIO3 (the board the >>> amp plugs into). The squeal seems to vary in frequency each time the >>> transmitter keys up (can only hear it when the radio is in TX). The squeal >>> is not very loud but its loud enough for me to hear it if I listen closely. >>> It doesn't seem to be power related. The squeal is there even if the radio >>> is in TX but no power going out (RF Pwr set to 0W). The closest thing I can >>> compare the sound to is perhaps a tiny leak in an air hose. Is this typical >>> of a bad solder joint or something? >>> >>> This squeal only pertains to the new KPA100 installation. Before the amp >>> was installed I didn't hear a thing. >>> >>> I should also note that nothing appears to be affecting performance. Puts >>> out 100 watts no problem. Clean modulation, etc. >>> >>> -------------- >>> Geoffrey Wolf >>> AB3LS (Amateur Radio Callsign) >>> University of Pittsburgh '14 >>> [hidden email] >>> [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 >>> >> >> > ______________________________________________________________ > 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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Do the fans turn on when the K3 is in TX test mode?
On Mon, Jun 27, 2011 at 10:21 AM, Guy Olinger K2AV <[hidden email]>wrote: > Check to make sure that the cables routed in front of the fans are not > touching. A light touch will result in a sound like that. It will > change or go away with the fan speed. > > 73, Guy. > > On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei <[hidden email]> > wrote: > > I have the same thing happening, similar series K3 (5k something) , also > assembled in March. > > > > Adi > > 2E0TTX > > > > > > On 27/06/2011 13:38, Joe Harris wrote: > >> I have very similar symptoms in my K3/100 (SN 5284) that I assembled in > >> March. It makes the sound even if I am in TX test mode. Again, no > >> performance issues, just a slightly bothersome squeal / whine. > >> > >> > >> > >> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey Wolf<[hidden email] > >wrote: > >> > >>> First off it was a great Field Day and my new K3 impressed me extremely > not > >>> only in performance but in it's functionality. > >>> > >>> To kick off Field Day I installed a new KPA100 into the K3. I did all > the > >>> necessary TX gain calibrations using a dummy load. > >>> > >>> One thing I noticed immediately was that I was hearing a very high > pitched > >>> squeal coming from either the PA board or possibly the KIO3 (the board > the > >>> amp plugs into). The squeal seems to vary in frequency each time the > >>> transmitter keys up (can only hear it when the radio is in TX). The > squeal > >>> is not very loud but its loud enough for me to hear it if I listen > closely. > >>> It doesn't seem to be power related. The squeal is there even if the > radio > >>> is in TX but no power going out (RF Pwr set to 0W). The closest thing I > can > >>> compare the sound to is perhaps a tiny leak in an air hose. Is this > typical > >>> of a bad solder joint or something? > >>> > >>> This squeal only pertains to the new KPA100 installation. Before the > amp > >>> was installed I didn't hear a thing. > >>> > >>> I should also note that nothing appears to be affecting performance. > Puts > >>> out 100 watts no problem. Clean modulation, etc. > >>> > >>> -------------- > >>> Geoffrey Wolf > >>> AB3LS (Amateur Radio Callsign) > >>> University of Pittsburgh '14 > >>> [hidden email] > >>> [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 > >>> > >> > >> > > ______________________________________________________________ > > 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 > -- Joe Harris, N1QD ______________________________________________________________ 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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Hi Joe,
They might. It's a temperature thing not a mode thing. You can manually turn the fans on and off and vary their speed. This might help in your analysis. Go to CONFIG: KPA3. It should be in the "nor" position. Turn the VFO A dial to change it to Fn1...Fn4. These are the 4 different fan speeds. Remember to put it back into the "nor" position. 73, Mike K2MK
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In reply to this post by Guy, K2AV
The fans are still but I still hear it. Almost like some switching PSU noise.
Adi 2e0ttx On 27/06/2011 15:21, Guy Olinger K2AV wrote: > Check to make sure that the cables routed in front of the fans are not > touching. A light touch will result in a sound like that. It will > change or go away with the fan speed. > > 73, Guy. > > On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei<[hidden email]> wrote: >> I have the same thing happening, similar series K3 (5k something) , also assembled in March. >> >> Adi >> 2E0TTX >> >> >> On 27/06/2011 13:38, Joe Harris wrote: >>> I have very similar symptoms in my K3/100 (SN 5284) that I assembled in >>> March. It makes the sound even if I am in TX test mode. Again, no >>> performance issues, just a slightly bothersome squeal / whine. >>> >>> >>> >>> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey Wolf<[hidden email]>wrote: >>> >>>> First off it was a great Field Day and my new K3 impressed me extremely not >>>> only in performance but in it's functionality. >>>> >>>> To kick off Field Day I installed a new KPA100 into the K3. I did all the >>>> necessary TX gain calibrations using a dummy load. >>>> >>>> One thing I noticed immediately was that I was hearing a very high pitched >>>> squeal coming from either the PA board or possibly the KIO3 (the board the >>>> amp plugs into). The squeal seems to vary in frequency each time the >>>> transmitter keys up (can only hear it when the radio is in TX). The squeal >>>> is not very loud but its loud enough for me to hear it if I listen closely. >>>> It doesn't seem to be power related. The squeal is there even if the radio >>>> is in TX but no power going out (RF Pwr set to 0W). The closest thing I can >>>> compare the sound to is perhaps a tiny leak in an air hose. Is this typical >>>> of a bad solder joint or something? >>>> >>>> This squeal only pertains to the new KPA100 installation. Before the amp >>>> was installed I didn't hear a thing. >>>> >>>> I should also note that nothing appears to be affecting performance. Puts >>>> out 100 watts no problem. Clean modulation, etc. >>>> >>>> -------------- >>>> Geoffrey Wolf >>>> AB3LS (Amateur Radio Callsign) >>>> University of Pittsburgh '14 >>>> [hidden email] >>>> [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 >>>> >>> >> ______________________________________________________________ >> 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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Could I suspect that the noise is from the vibration of the ferrite core of the RF transformers in the PA unit? When I tx, I can hear some vibration synchronise to my voice.
TNX & 73, Johnny VR2XMC 從︰ Adi Andrei <[hidden email]> 收件人︰ Guy Olinger K2AV <[hidden email]> 副本(CC)︰ [hidden email] 傳送日期︰ 2011年06月28日 (週二) 8:37 AM 主題︰ Re: [Elecraft] K3: KPA100 Squeal The fans are still but I still hear it. Almost like some switching PSU noise. Adi 2e0ttx On 27/06/2011 15:21, Guy Olinger K2AV wrote: > Check to make sure that the cables routed in front of the fans are not > touching. A light touch will result in a sound like that. It will > change or go away with the fan speed. > > 73, Guy. > > On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei<[hidden email]> wrote: >> I have the same thing happening, similar series K3 (5k something) , also assembled in March. >> >> Adi >> 2E0TTX >> >> >> On 27/06/2011 13:38, Joe Harris wrote: >>> I have very similar symptoms in my K3/100 (SN 5284) that I assembled in >>> March. It makes the sound even if I am in TX test mode. Again, no >>> performance issues, just a slightly bothersome squeal / whine. >>> >>> >>> >>> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey Wolf<[hidden email]>wrote: >>> >>>> First off it was a great Field Day and my new K3 impressed me extremely not >>>> only in performance but in it's functionality. >>>> >>>> To kick off Field Day I installed a new KPA100 into the K3. I did all the >>>> necessary TX gain calibrations using a dummy load. >>>> >>>> One thing I noticed immediately was that I was hearing a very high pitched >>>> squeal coming from either the PA board or possibly the KIO3 (the board the >>>> amp plugs into). The squeal seems to vary in frequency each time the >>>> transmitter keys up (can only hear it when the radio is in TX). The squeal >>>> is not very loud but its loud enough for me to hear it if I listen closely. >>>> It doesn't seem to be power related. The squeal is there even if the radio >>>> is in TX but no power going out (RF Pwr set to 0W). The closest thing I can >>>> compare the sound to is perhaps a tiny leak in an air hose. Is this typical >>>> of a bad solder joint or something? >>>> >>>> This squeal only pertains to the new KPA100 installation. Before the amp >>>> was installed I didn't hear a thing. >>>> >>>> I should also note that nothing appears to be affecting performance. Puts >>>> out 100 watts no problem. Clean modulation, etc. >>>> >>>> -------------- >>>> Geoffrey Wolf >>>> AB3LS (Amateur Radio Callsign) >>>> University of Pittsburgh '14 >>>> [hidden email] >>>> [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 >>>> >>> >> ______________________________________________________________ >> 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 ______________________________________________________________ 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 aandrei
If you can do it, see if you still have the noise running off a
battery. 73, Guy. On Mon, Jun 27, 2011 at 8:37 PM, Adi Andrei <[hidden email]> wrote: > The fans are still but I still hear it. Almost like some switching PSU > noise. > > Adi > 2e0ttx > > On 27/06/2011 15:21, Guy Olinger K2AV wrote: >> >> Check to make sure that the cables routed in front of the fans are not >> touching. A light touch will result in a sound like that. It will >> change or go away with the fan speed. >> >> 73, Guy. >> >> On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei<[hidden email]> >> wrote: >>> >>> I have the same thing happening, similar series K3 (5k something) , also >>> assembled in March. >>> >>> Adi >>> 2E0TTX >>> >>> >>> On 27/06/2011 13:38, Joe Harris wrote: >>>> >>>> I have very similar symptoms in my K3/100 (SN 5284) that I assembled in >>>> March. It makes the sound even if I am in TX test mode. Again, no >>>> performance issues, just a slightly bothersome squeal / whine. >>>> >>>> >>>> >>>> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey >>>> Wolf<[hidden email]>wrote: >>>> >>>>> First off it was a great Field Day and my new K3 impressed me extremely >>>>> not >>>>> only in performance but in it's functionality. >>>>> >>>>> To kick off Field Day I installed a new KPA100 into the K3. I did all >>>>> the >>>>> necessary TX gain calibrations using a dummy load. >>>>> >>>>> One thing I noticed immediately was that I was hearing a very high >>>>> pitched >>>>> squeal coming from either the PA board or possibly the KIO3 (the board >>>>> the >>>>> amp plugs into). The squeal seems to vary in frequency each time the >>>>> transmitter keys up (can only hear it when the radio is in TX). The >>>>> squeal >>>>> is not very loud but its loud enough for me to hear it if I listen >>>>> closely. >>>>> It doesn't seem to be power related. The squeal is there even if the >>>>> radio >>>>> is in TX but no power going out (RF Pwr set to 0W). The closest thing I >>>>> can >>>>> compare the sound to is perhaps a tiny leak in an air hose. Is this >>>>> typical >>>>> of a bad solder joint or something? >>>>> >>>>> This squeal only pertains to the new KPA100 installation. Before the >>>>> amp >>>>> was installed I didn't hear a thing. >>>>> >>>>> I should also note that nothing appears to be affecting performance. >>>>> Puts >>>>> out 100 watts no problem. Clean modulation, etc. >>>>> >>>>> -------------- >>>>> Geoffrey Wolf >>>>> AB3LS (Amateur Radio Callsign) >>>>> University of Pittsburgh '14 >>>>> [hidden email] >>>>> [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 >>>>> >>>> >>> ______________________________________________________________ >>> 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 haven't had a chance to try to run the rig off a battery.
However, I was able to record the sound using my iPhone. I have uploaded the audio file here: http://alien.liltechdude.com/files/Recordings/kpasqueal.mp3 I made sure the fan power cables weren't touching the fans/each other. AB3LS On Mon, Jun 27, 2011 at 10:14 PM, Guy Olinger K2AV <[hidden email]>wrote: > If you can do it, see if you still have the noise running off a > battery. 73, Guy. > > On Mon, Jun 27, 2011 at 8:37 PM, Adi Andrei <[hidden email]> > wrote: > > The fans are still but I still hear it. Almost like some switching PSU > > noise. > > > > Adi > > 2e0ttx > > > > On 27/06/2011 15:21, Guy Olinger K2AV wrote: > >> > >> Check to make sure that the cables routed in front of the fans are not > >> touching. A light touch will result in a sound like that. It will > >> change or go away with the fan speed. > >> > >> 73, Guy. > >> > >> On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei<[hidden email]> > >> wrote: > >>> > >>> I have the same thing happening, similar series K3 (5k something) , > also > >>> assembled in March. > >>> > >>> Adi > >>> 2E0TTX > >>> > >>> > >>> On 27/06/2011 13:38, Joe Harris wrote: > >>>> > >>>> I have very similar symptoms in my K3/100 (SN 5284) that I assembled > in > >>>> March. It makes the sound even if I am in TX test mode. Again, no > >>>> performance issues, just a slightly bothersome squeal / whine. > >>>> > >>>> > >>>> > >>>> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey > >>>> Wolf<[hidden email]>wrote: > >>>> > >>>>> First off it was a great Field Day and my new K3 impressed me > extremely > >>>>> not > >>>>> only in performance but in it's functionality. > >>>>> > >>>>> To kick off Field Day I installed a new KPA100 into the K3. I did all > >>>>> the > >>>>> necessary TX gain calibrations using a dummy load. > >>>>> > >>>>> One thing I noticed immediately was that I was hearing a very high > >>>>> pitched > >>>>> squeal coming from either the PA board or possibly the KIO3 (the > board > >>>>> the > >>>>> amp plugs into). The squeal seems to vary in frequency each time the > >>>>> transmitter keys up (can only hear it when the radio is in TX). The > >>>>> squeal > >>>>> is not very loud but its loud enough for me to hear it if I listen > >>>>> closely. > >>>>> It doesn't seem to be power related. The squeal is there even if the > >>>>> radio > >>>>> is in TX but no power going out (RF Pwr set to 0W). The closest thing > I > >>>>> can > >>>>> compare the sound to is perhaps a tiny leak in an air hose. Is this > >>>>> typical > >>>>> of a bad solder joint or something? > >>>>> > >>>>> This squeal only pertains to the new KPA100 installation. Before the > >>>>> amp > >>>>> was installed I didn't hear a thing. > >>>>> > >>>>> I should also note that nothing appears to be affecting performance. > >>>>> Puts > >>>>> out 100 watts no problem. Clean modulation, etc. > >>>>> > >>>>> -------------- > >>>>> Geoffrey Wolf > >>>>> AB3LS (Amateur Radio Callsign) > >>>>> University of Pittsburgh '14 > >>>>> [hidden email] > >>>>> [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 > >>>>> > >>>> > >>> ______________________________________________________________ > >>> 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 > 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
Geoffrey Wolf
AB3LS University of Pittsburgh '14 grw20@pitt.edu liltechdude13@gmail.com http://www.ab3ls.com |
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Forgot to mention,
That recording was made using QSK CW in the TX Test mode. AB3LS On Thu, Jun 30, 2011 at 8:12 AM, Geoff Wolf AB3LS <[hidden email]>wrote: > I haven't had a chance to try to run the rig off a battery. > > However, I was able to record the sound using my iPhone. > > I have uploaded the audio file here: > http://alien.liltechdude.com/files/Recordings/kpasqueal.mp3 > > I made sure the fan power cables weren't touching the fans/each other. > > AB3LS > > > > > On Mon, Jun 27, 2011 at 10:14 PM, Guy Olinger K2AV <[hidden email]>wrote: > >> If you can do it, see if you still have the noise running off a >> battery. 73, Guy. >> >> On Mon, Jun 27, 2011 at 8:37 PM, Adi Andrei <[hidden email]> >> wrote: >> > The fans are still but I still hear it. Almost like some switching PSU >> > noise. >> > >> > Adi >> > 2e0ttx >> > >> > On 27/06/2011 15:21, Guy Olinger K2AV wrote: >> >> >> >> Check to make sure that the cables routed in front of the fans are not >> >> touching. A light touch will result in a sound like that. It will >> >> change or go away with the fan speed. >> >> >> >> 73, Guy. >> >> >> >> On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei<[hidden email]> >> >> wrote: >> >>> >> >>> I have the same thing happening, similar series K3 (5k something) , >> also >> >>> assembled in March. >> >>> >> >>> Adi >> >>> 2E0TTX >> >>> >> >>> >> >>> On 27/06/2011 13:38, Joe Harris wrote: >> >>>> >> >>>> I have very similar symptoms in my K3/100 (SN 5284) that I assembled >> in >> >>>> March. It makes the sound even if I am in TX test mode. Again, no >> >>>> performance issues, just a slightly bothersome squeal / whine. >> >>>> >> >>>> >> >>>> >> >>>> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey >> >>>> Wolf<[hidden email]>wrote: >> >>>> >> >>>>> First off it was a great Field Day and my new K3 impressed me >> extremely >> >>>>> not >> >>>>> only in performance but in it's functionality. >> >>>>> >> >>>>> To kick off Field Day I installed a new KPA100 into the K3. I did >> all >> >>>>> the >> >>>>> necessary TX gain calibrations using a dummy load. >> >>>>> >> >>>>> One thing I noticed immediately was that I was hearing a very high >> >>>>> pitched >> >>>>> squeal coming from either the PA board or possibly the KIO3 (the >> board >> >>>>> the >> >>>>> amp plugs into). The squeal seems to vary in frequency each time the >> >>>>> transmitter keys up (can only hear it when the radio is in TX). The >> >>>>> squeal >> >>>>> is not very loud but its loud enough for me to hear it if I listen >> >>>>> closely. >> >>>>> It doesn't seem to be power related. The squeal is there even if the >> >>>>> radio >> >>>>> is in TX but no power going out (RF Pwr set to 0W). The closest >> thing I >> >>>>> can >> >>>>> compare the sound to is perhaps a tiny leak in an air hose. Is this >> >>>>> typical >> >>>>> of a bad solder joint or something? >> >>>>> >> >>>>> This squeal only pertains to the new KPA100 installation. Before the >> >>>>> amp >> >>>>> was installed I didn't hear a thing. >> >>>>> >> >>>>> I should also note that nothing appears to be affecting performance. >> >>>>> Puts >> >>>>> out 100 watts no problem. Clean modulation, etc. >> >>>>> >> >>>>> -------------- >> >>>>> Geoffrey Wolf >> >>>>> AB3LS (Amateur Radio Callsign) >> >>>>> University of Pittsburgh '14 >> >>>>> [hidden email] >> >>>>> [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 >> >>>>> >> >>>> >> >>> ______________________________________________________________ >> >>> 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 >> > > 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
Geoffrey Wolf
AB3LS University of Pittsburgh '14 grw20@pitt.edu liltechdude13@gmail.com http://www.ab3ls.com |
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And, for even more information, I analyzed the audio that I recorded and the
squeal is right around 12Khz. It peaks at -48dB (louder than the QSK relay clicking) http://imgur.com/V8o5t - image of the analysis AB3LS On Thu, Jun 30, 2011 at 8:17 AM, Geoff Wolf AB3LS <[hidden email]>wrote: > Forgot to mention, > > That recording was made using QSK CW in the TX Test mode. > > AB3LS > > > On Thu, Jun 30, 2011 at 8:12 AM, Geoff Wolf AB3LS <[hidden email] > > wrote: > >> I haven't had a chance to try to run the rig off a battery. >> >> However, I was able to record the sound using my iPhone. >> >> I have uploaded the audio file here: >> http://alien.liltechdude.com/files/Recordings/kpasqueal.mp3 >> >> I made sure the fan power cables weren't touching the fans/each other. >> >> AB3LS >> >> >> >> >> On Mon, Jun 27, 2011 at 10:14 PM, Guy Olinger K2AV <[hidden email] >> > wrote: >> >>> If you can do it, see if you still have the noise running off a >>> battery. 73, Guy. >>> >>> On Mon, Jun 27, 2011 at 8:37 PM, Adi Andrei <[hidden email]> >>> wrote: >>> > The fans are still but I still hear it. Almost like some switching PSU >>> > noise. >>> > >>> > Adi >>> > 2e0ttx >>> > >>> > On 27/06/2011 15:21, Guy Olinger K2AV wrote: >>> >> >>> >> Check to make sure that the cables routed in front of the fans are not >>> >> touching. A light touch will result in a sound like that. It will >>> >> change or go away with the fan speed. >>> >> >>> >> 73, Guy. >>> >> >>> >> On Mon, Jun 27, 2011 at 9:10 AM, Adi Andrei<[hidden email]> >>> >> wrote: >>> >>> >>> >>> I have the same thing happening, similar series K3 (5k something) , >>> also >>> >>> assembled in March. >>> >>> >>> >>> Adi >>> >>> 2E0TTX >>> >>> >>> >>> >>> >>> On 27/06/2011 13:38, Joe Harris wrote: >>> >>>> >>> >>>> I have very similar symptoms in my K3/100 (SN 5284) that I assembled >>> in >>> >>>> March. It makes the sound even if I am in TX test mode. Again, no >>> >>>> performance issues, just a slightly bothersome squeal / whine. >>> >>>> >>> >>>> >>> >>>> >>> >>>> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey >>> >>>> Wolf<[hidden email]>wrote: >>> >>>> >>> >>>>> First off it was a great Field Day and my new K3 impressed me >>> extremely >>> >>>>> not >>> >>>>> only in performance but in it's functionality. >>> >>>>> >>> >>>>> To kick off Field Day I installed a new KPA100 into the K3. I did >>> all >>> >>>>> the >>> >>>>> necessary TX gain calibrations using a dummy load. >>> >>>>> >>> >>>>> One thing I noticed immediately was that I was hearing a very high >>> >>>>> pitched >>> >>>>> squeal coming from either the PA board or possibly the KIO3 (the >>> board >>> >>>>> the >>> >>>>> amp plugs into). The squeal seems to vary in frequency each time >>> the >>> >>>>> transmitter keys up (can only hear it when the radio is in TX). The >>> >>>>> squeal >>> >>>>> is not very loud but its loud enough for me to hear it if I listen >>> >>>>> closely. >>> >>>>> It doesn't seem to be power related. The squeal is there even if >>> the >>> >>>>> radio >>> >>>>> is in TX but no power going out (RF Pwr set to 0W). The closest >>> thing I >>> >>>>> can >>> >>>>> compare the sound to is perhaps a tiny leak in an air hose. Is this >>> >>>>> typical >>> >>>>> of a bad solder joint or something? >>> >>>>> >>> >>>>> This squeal only pertains to the new KPA100 installation. Before >>> the >>> >>>>> amp >>> >>>>> was installed I didn't hear a thing. >>> >>>>> >>> >>>>> I should also note that nothing appears to be affecting >>> performance. >>> >>>>> Puts >>> >>>>> out 100 watts no problem. Clean modulation, etc. >>> >>>>> >>> >>>>> -------------- >>> >>>>> Geoffrey Wolf >>> >>>>> AB3LS (Amateur Radio Callsign) >>> >>>>> University of Pittsburgh '14 >>> >>>>> [hidden email] >>> >>>>> [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 >>> >>>>> >>> >>>> >>> >>> ______________________________________________________________ >>> >>> 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 >>> >> >> > 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
Geoffrey Wolf
AB3LS University of Pittsburgh '14 grw20@pitt.edu liltechdude13@gmail.com http://www.ab3ls.com |
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Geoff,
How are you hearing any "QSK relay clicking" in the K3? There are no relays changed between receive and transmit, it is all silent electronic switching. If you are hearing something that sounds like a relay click, then that needs to be investigated - it should not be. Sorry, but I cannot venture any guess about the source of the 12 kHz. Have you tried turning the monitor down to zero? Where does the source seem to be located? Do you still hear it if you go to the CONFIG menu and set the KPA3 to "not installed"? 73, Don W3FPR On 6/30/2011 9:24 AM, Geoff Wolf AB3LS wrote: > And, for even more information, I analyzed the audio that I recorded and the > squeal is right around 12Khz. It peaks at -48dB (louder than the QSK relay > clicking) > > http://imgur.com/V8o5t - image of the analysis > ______________________________________________________________ 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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Sorry. I shouldn't have said QSK relay.
I took out the KPA and popped the 10W jumper back in. The 12Khz squeal is gone. I hear a little bit of clicking coming from the LPA board but nothing that I would suspect is abnormal. Here's the slightest clicking I'm hearing without the KPA installed ( http://alien.liltechdude.com/files/Recordings/Memo.mp3 ) I popped the KPA back in and changed the setting to KPA not installed and still hear the 12Khz squeal and the louder 'clicking'. It sounds like it's coming from either the KPA board or the KPAIO3 (the board the amp plugs into) Everything I have described can be heard using the audio files I posted. AB3LS On Thu, Jun 30, 2011 at 10:04 AM, Don Wilhelm <[hidden email]> wrote: > Geoff, > > How are you hearing any "QSK relay clicking" in the K3? There are no > relays changed between receive and transmit, it is all silent electronic > switching. If you are hearing something that sounds like a relay click, > then that needs to be investigated - it should not be. > > Sorry, but I cannot venture any guess about the source of the 12 kHz. > Have you tried turning the monitor down to zero? Where does the source > seem to be located? > Do you still hear it if you go to the CONFIG menu and set the KPA3 to "not > installed"? > > 73, > Don W3FPR > > > On 6/30/2011 9:24 AM, Geoff Wolf AB3LS wrote: > >> And, for even more information, I analyzed the audio that I recorded and >> the >> squeal is right around 12Khz. It peaks at -48dB (louder than the QSK relay >> clicking) >> >> http://imgur.com/V8o5t - image of the analysis >> >> 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
Geoffrey Wolf
AB3LS University of Pittsburgh '14 grw20@pitt.edu liltechdude13@gmail.com http://www.ab3ls.com |
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In reply to this post by AB3LS
Hi Geoff, below...
On Thu, Jun 30, 2011 at 9:24 AM, Geoff Wolf AB3LS <[hidden email]> wrote: > And, for even more information, I analyzed the audio that I recorded and the > squeal is right around 12Khz. It peaks at -48dB (louder than the QSK relay > clicking) > > http://imgur.com/V8o5t - image of the analysis > > AB3LS With your image I realize I had been making some assumptions. I need to fill in some details... Are you listening to the audio in earphones or are you hearing it in the free air. I had been assuming listening with your ears only in free air to miscellaneous sound in the neighborhood of the K3. *ASSUMING* open air, what did you use to record the sound levels? Would point out that the recordings don't get the sound to me, possibly because the program devices you are using won't pass 12 kHz. It would we difficult for me in any event as my hearing can barely hear anything at that frequency. This as opposed to MY college days, when I could hear 15 kHz made by the old analog TV set sweep generator. There are a lot of us in that highs reduced hearing state, so many will tell you they don't hear a 12 kHz squeal. And they don't, whether or not it is there. Likewise, any clicking that is made from a 12 kHz basis. In any event, I doubt it is being transmitted (have someone check up and down 12 kHz from you sending) because a spectral purity issue would have been beaten to death here (no shortage whatsoever of beaters-to-death on the reflector). There WERE some spectral purity issues early on that needed physical mods to boards and are standard in the mfr version for a long time now. The puzzler is hearing it when the KPA is set to "not installed" in the config menu. This leads me to wonder if you have that spur from your power supply. You ARE talking about a level that would pass spec. It could be that there is something in the KPA that is mechanically resonant to 12 kHz and will respond to it if it is on the power. You will need to put an audio scope on the power supply. In any event, you need to rule out having stuff on your DC lead from your power supply. 73, Guy. ______________________________________________________________ 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 looked at the MP3 file using Goldwave. It appears to me that the "12 KHz" component is present only during the tics, not continuously.
The tic period is roughly 270 msec (I have no idea what the tic is of course). I zoomed in to a single tic (see PDF of images at the link below). It appears that each tic has a very distinct pattern seen in the individual samples which I suspect is the 12 KHz energy. I have no idea what any of this means. 73, Chuck, W5UXH Las Cruces, NM Images and comments from Goldwave view of the MP3 file
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A repeated 12 kHz would be echoed all over the room and lose a lot of
it's pulse nature. This continues to look suspiciously like crap from a 12 volt switching power supply that is somehow finding something mechanically resonant in the K3. Back to asking for 12 volts from a linear supply (transformer and 60 Hz rectifiers) or battery. Is this particular K3 serial # prior to the introduction of gold plated pins for the KPAIO3 connection? 73, Guy. On Thu, Jun 30, 2011 at 1:52 PM, W5UXH <[hidden email]> wrote: > I looked at the MP3 file using Goldwave. It appears to me that the "12 KHz" > component is present only during the tics, not continuously. > > The tic period is roughly 270 msec (I have no idea what the tic is of > course). I zoomed in to a single tic (see PDF of images at the link > below). It appears that each tic has a very distinct pattern seen in the > individual samples which I suspect is the 12 KHz energy. > > I have no idea what any of this means. > > 73, > > Chuck, W5UXH > Las Cruces, NM > > https://sites.google.com/site/k3lineoutrecordings/ab3ls-mp3-file-analysis > Images and comments from Goldwave view of the MP3 file > > > Guy, K2AV wrote: >> >> Hi Geoff, below... >> >> On Thu, Jun 30, 2011 at 9:24 AM, Geoff Wolf AB3LS >> <[hidden email]> wrote: >>> And, for even more information, I analyzed the audio that I recorded and >>> the >>> squeal is right around 12Khz. It peaks at -48dB (louder than the QSK >>> relay >>> clicking) >>> >>> http://imgur.com/V8o5t - image of the analysis >>> >>> AB3LS >> >> With your image I realize I had been making some assumptions. I need >> to fill in some details... >> >> Are you listening to the audio in earphones or are you hearing it in >> the free air. I had been assuming listening with your ears only in >> free air to miscellaneous sound in the neighborhood of the K3. >> > > > -- > View this message in context: http://elecraft.365791.n2.nabble.com/K3-KPA100-Squeal-tp6518460p6534295.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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This is a brand new K3 that I assembled about a month ago. The Serial Number
is 5517. I have been using an Astron SS-25A power supply with this which is indeed a switcher. I have a battery that I'll be hooking up to it to see if this is still a problem. On Thu, Jun 30, 2011 at 4:41 PM, Guy Olinger K2AV <[hidden email]>wrote: > A repeated 12 kHz would be echoed all over the room and lose a lot of > it's pulse nature. This continues to look suspiciously like crap from > a 12 volt switching power supply that is somehow finding something > mechanically resonant in the K3. > > Back to asking for 12 volts from a linear supply (transformer and 60 > Hz rectifiers) or battery. > > Is this particular K3 serial # prior to the introduction of gold > plated pins for the KPAIO3 connection? > > 73, Guy. > > On Thu, Jun 30, 2011 at 1:52 PM, W5UXH <[hidden email]> wrote: > > I looked at the MP3 file using Goldwave. It appears to me that the "12 > KHz" > > component is present only during the tics, not continuously. > > > > The tic period is roughly 270 msec (I have no idea what the tic is of > > course). I zoomed in to a single tic (see PDF of images at the link > > below). It appears that each tic has a very distinct pattern seen in the > > individual samples which I suspect is the 12 KHz energy. > > > > I have no idea what any of this means. > > > > 73, > > > > Chuck, W5UXH > > Las Cruces, NM > > > > > https://sites.google.com/site/k3lineoutrecordings/ab3ls-mp3-file-analysis > > Images and comments from Goldwave view of the MP3 file > > > > > > Guy, K2AV wrote: > >> > >> Hi Geoff, below... > >> > >> On Thu, Jun 30, 2011 at 9:24 AM, Geoff Wolf AB3LS > >> <[hidden email]> wrote: > >>> And, for even more information, I analyzed the audio that I recorded > and > >>> the > >>> squeal is right around 12Khz. It peaks at -48dB (louder than the QSK > >>> relay > >>> clicking) > >>> > >>> http://imgur.com/V8o5t - image of the analysis > >>> > >>> AB3LS > >> > >> With your image I realize I had been making some assumptions. I need > >> to fill in some details... > >> > >> Are you listening to the audio in earphones or are you hearing it in > >> the free air. I had been assuming listening with your ears only in > >> free air to miscellaneous sound in the neighborhood of the K3. > >> > > > > > > -- > > View this message in context: > http://elecraft.365791.n2.nabble.com/K3-KPA100-Squeal-tp6518460p6534295.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 > 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
Geoffrey Wolf
AB3LS University of Pittsburgh '14 grw20@pitt.edu liltechdude13@gmail.com http://www.ab3ls.com |
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No go.
Hooked the radio up to a gel cel battery and we're still getting the 12Khz junk coming from something and the clicking between TX and RX. I made a longer recording of the 'junk' and posted it. Cycled between TX and RX a few times using the manual TX button on the front. Then finished off with a few dits and dahs. All while in TX Test mode. http://alien.liltechdude.com/files/index.php?dir=Recordings/&file=kpa3squealrev2.mp3 Anyone from Elecraft have anything on this? AB3LS On Fri, Jul 1, 2011 at 1:24 AM, Geoff Wolf AB3LS <[hidden email]>wrote: > This is a brand new K3 that I assembled about a month ago. The Serial > Number is 5517. > > I have been using an Astron SS-25A power supply with this which is indeed a > switcher. I have a battery that I'll be hooking up to it to see if this is > still a problem. > > > On Thu, Jun 30, 2011 at 4:41 PM, Guy Olinger K2AV <[hidden email]>wrote: > >> A repeated 12 kHz would be echoed all over the room and lose a lot of >> it's pulse nature. This continues to look suspiciously like crap from >> a 12 volt switching power supply that is somehow finding something >> mechanically resonant in the K3. >> >> Back to asking for 12 volts from a linear supply (transformer and 60 >> Hz rectifiers) or battery. >> >> Is this particular K3 serial # prior to the introduction of gold >> plated pins for the KPAIO3 connection? >> >> 73, Guy. >> >> On Thu, Jun 30, 2011 at 1:52 PM, W5UXH <[hidden email]> wrote: >> > I looked at the MP3 file using Goldwave. It appears to me that the "12 >> KHz" >> > component is present only during the tics, not continuously. >> > >> > The tic period is roughly 270 msec (I have no idea what the tic is of >> > course). I zoomed in to a single tic (see PDF of images at the link >> > below). It appears that each tic has a very distinct pattern seen in >> the >> > individual samples which I suspect is the 12 KHz energy. >> > >> > I have no idea what any of this means. >> > >> > 73, >> > >> > Chuck, W5UXH >> > Las Cruces, NM >> > >> > >> https://sites.google.com/site/k3lineoutrecordings/ab3ls-mp3-file-analysis >> > Images and comments from Goldwave view of the MP3 file >> > >> > >> > Guy, K2AV wrote: >> >> >> >> Hi Geoff, below... >> >> >> >> On Thu, Jun 30, 2011 at 9:24 AM, Geoff Wolf AB3LS >> >> <[hidden email]> wrote: >> >>> And, for even more information, I analyzed the audio that I recorded >> and >> >>> the >> >>> squeal is right around 12Khz. It peaks at -48dB (louder than the QSK >> >>> relay >> >>> clicking) >> >>> >> >>> http://imgur.com/V8o5t - image of the analysis >> >>> >> >>> AB3LS >> >> >> >> With your image I realize I had been making some assumptions. I need >> >> to fill in some details... >> >> >> >> Are you listening to the audio in earphones or are you hearing it in >> >> the free air. I had been assuming listening with your ears only in >> >> free air to miscellaneous sound in the neighborhood of the K3. >> >> >> > >> > >> > -- >> > View this message in context: >> http://elecraft.365791.n2.nabble.com/K3-KPA100-Squeal-tp6518460p6534295.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 >> > > 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
Geoffrey Wolf
AB3LS University of Pittsburgh '14 grw20@pitt.edu liltechdude13@gmail.com http://www.ab3ls.com |
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I just listened to Geoff's recording, and this is exactly what is happening
with my K3/100. On Fri, Jul 1, 2011 at 1:49 AM, Geoff Wolf AB3LS <[hidden email]>wrote: > No go. > > Hooked the radio up to a gel cel battery and we're still getting the 12Khz > junk coming from something and the clicking between TX and RX. > > I made a longer recording of the 'junk' and posted it. Cycled between TX > and > RX a few times using the manual TX button on the front. Then finished off > with a few dits and dahs. All while in TX Test mode. > > > http://alien.liltechdude.com/files/index.php?dir=Recordings/&file=kpa3squealrev2.mp3 > > Anyone from Elecraft have anything on this? > > AB3LS > > On Fri, Jul 1, 2011 at 1:24 AM, Geoff Wolf AB3LS <[hidden email] > >wrote: > > > This is a brand new K3 that I assembled about a month ago. The Serial > > Number is 5517. > > > > I have been using an Astron SS-25A power supply with this which is indeed > a > > switcher. I have a battery that I'll be hooking up to it to see if this > is > > still a problem. > > > > > > On Thu, Jun 30, 2011 at 4:41 PM, Guy Olinger K2AV <[hidden email] > >wrote: > > > >> A repeated 12 kHz would be echoed all over the room and lose a lot of > >> it's pulse nature. This continues to look suspiciously like crap from > >> a 12 volt switching power supply that is somehow finding something > >> mechanically resonant in the K3. > >> > >> Back to asking for 12 volts from a linear supply (transformer and 60 > >> Hz rectifiers) or battery. > >> > >> Is this particular K3 serial # prior to the introduction of gold > >> plated pins for the KPAIO3 connection? > >> > >> 73, Guy. > >> > >> On Thu, Jun 30, 2011 at 1:52 PM, W5UXH <[hidden email]> > wrote: > >> > I looked at the MP3 file using Goldwave. It appears to me that the > "12 > >> KHz" > >> > component is present only during the tics, not continuously. > >> > > >> > The tic period is roughly 270 msec (I have no idea what the tic is of > >> > course). I zoomed in to a single tic (see PDF of images at the link > >> > below). It appears that each tic has a very distinct pattern seen in > >> the > >> > individual samples which I suspect is the 12 KHz energy. > >> > > >> > I have no idea what any of this means. > >> > > >> > 73, > >> > > >> > Chuck, W5UXH > >> > Las Cruces, NM > >> > > >> > > >> > https://sites.google.com/site/k3lineoutrecordings/ab3ls-mp3-file-analysis > >> > Images and comments from Goldwave view of the MP3 file > >> > > >> > > >> > Guy, K2AV wrote: > >> >> > >> >> Hi Geoff, below... > >> >> > >> >> On Thu, Jun 30, 2011 at 9:24 AM, Geoff Wolf AB3LS > >> >> <[hidden email]> wrote: > >> >>> And, for even more information, I analyzed the audio that I recorded > >> and > >> >>> the > >> >>> squeal is right around 12Khz. It peaks at -48dB (louder than the QSK > >> >>> relay > >> >>> clicking) > >> >>> > >> >>> http://imgur.com/V8o5t - image of the analysis > >> >>> > >> >>> AB3LS > >> >> > >> >> With your image I realize I had been making some assumptions. I need > >> >> to fill in some details... > >> >> > >> >> Are you listening to the audio in earphones or are you hearing it in > >> >> the free air. I had been assuming listening with your ears only in > >> >> free air to miscellaneous sound in the neighborhood of the K3. > >> >> > >> > > >> > > >> > -- > >> > View this message in context: > >> > http://elecraft.365791.n2.nabble.com/K3-KPA100-Squeal-tp6518460p6534295.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 > >> > > > > > ______________________________________________________________ > 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 > -- Joe Harris, N1QD ______________________________________________________________ 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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