I am having an issue with distorted audio once the KPA100 kicks in at
about 10-12v. The KPA100 is putting out 100 watts I have re-calibrated the radio with no change. I am testing with the hand mic and a dummy load. Which should eliminate any external devices causing it Any suggestions as to what can be causing this issue? Thanks Rich K3RWN ______________________________________________________________ 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 Message delivered to [hidden email] |
Rich,
Connect an external wattmeter and a dummy load. Then set the K2 power to 50 watts and do a TUNE. What is the actual power output? If it is much greater than 100 watts (as I suspect), then you do not have power control and that says that the wattmeter in the KPA100 has been damaged - likely from static coming in on the feedline. Replace D16 and D17 in the KPA100 and the problem should go away. 73, Don W3FPR On 4/6/2020 11:36 AM, Rich wrote: > I am having an issue with distorted audio once the KPA100 kicks in at > about 10-12v. > > The KPA100 is putting out 100 watts > > I have re-calibrated the radio with no change. > > I am testing with the hand mic and a dummy load. Which should > eliminate any external devices causing it > > Any suggestions as to what can be causing this issue? > 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 Message delivered to [hidden email] |
Just to make sure that was a typo you said K2??
I did your test on my K3S and I am getting about 55 watts on the meter Any other ideas? Thank you so much Rich On 4/6/2020 13:01 PM, Don Wilhelm wrote: > Rich, > > Connect an external wattmeter and a dummy load. > Then set the K2 power to 50 watts and do a TUNE. > What is the actual power output? If it is much greater than 100 watts > (as I suspect), then you do not have power control and that says that > the wattmeter in the KPA100 has been damaged - likely from static > coming in on the feedline. > Replace D16 and D17 in the KPA100 and the problem should go away. > > 73, > Don W3FPR > > On 4/6/2020 11:36 AM, Rich wrote: >> I am having an issue with distorted audio once the KPA100 kicks in at >> about 10-12v. >> >> The KPA100 is putting out 100 watts >> >> I have re-calibrated the radio with no change. >> >> I am testing with the hand mic and a dummy load. Which should >> eliminate any external devices causing it >> >> Any suggestions as to what can be causing this issue? >> 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 Message delivered to [hidden email] |
In reply to this post by Rich-4
I’d say that 10 - 12 volts is too low. The supply should be 13.8 to 14.8.
Bob, K4TAX Sent from my iPhone > On Apr 6, 2020, at 10:52 AM, Rich <[hidden email]> wrote: > > I am having an issue with distorted audio once the KPA100 kicks in at about 10-12v. > > The KPA100 is putting out 100 watts > > I have re-calibrated the radio with no change. > > I am testing with the hand mic and a dummy load. Which should eliminate any external devices causing it > > Any suggestions as to what can be causing this issue? > > Thanks > > Rich > > K3RWN > > ______________________________________________________________ > 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 > Message delivered to [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 Message delivered to [hidden email] |
In reply to this post by Rich-4
Rich,
Well, since the KPA100 is an option for the K2 (and not for any other transceiver), I did not make a typo. Since you have the K3S, the 100 watt amplifier is the KPA3. That is why one has to be careful when specifying designations of options. As I recall, that distorted audio on the K3S is a symptom of a failure in the LPA on the RF Board. Contact [hidden email] to get some points to check. 73, Don W3FPR On 4/6/2020 1:43 PM, Rich wrote: > Just to make sure that was a typo you said K2?? > > I did your test on my K3S and I am getting about 55 watts on the meter > > Any other ideas? > > Thank you so much > ______________________________________________________________ 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 Message delivered to [hidden email] |
Thanks for your help as always. Well frankly I have been calling it
the wrong thing forever. Rich On 4/6/2020 14:09 PM, Don Wilhelm wrote: > Rich, > > Well, since the KPA100 is an option for the K2 (and not for any other > transceiver), I did not make a typo. > Since you have the K3S, the 100 watt amplifier is the KPA3. > That is why one has to be careful when specifying designations of > options. > > As I recall, that distorted audio on the K3S is a symptom of a failure > in the LPA on the RF Board. Contact [hidden email] to get some > points to check. > > 73, > Don W3FPR > > On 4/6/2020 1:43 PM, Rich wrote: >> Just to make sure that was a typo you said K2?? >> >> I did your test on my K3S and I am getting about 55 watts on the meter >> >> Any other ideas? >> >> Thank you so much >> > > 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 Message delivered to [hidden email] |
In reply to this post by Don Wilhelm
From my experience Don is correct that a failure of the KPA3A will cause distortion. Mine failed twice and was replaced by Elecraft.
The best description of the failure is “fuzzy audio”. I don’t recall the output was showing less than 100 watts. Bob, K4TAX Sent from my iPhone > On Apr 6, 2020, at 1:25 PM, Don Wilhelm <[hidden email]> wrote: > > Rich, > > Well, since the KPA100 is an option for the K2 (and not for any other transceiver), I did not make a typo. > Since you have the K3S, the 100 watt amplifier is the KPA3. > That is why one has to be careful when specifying designations of options. > > As I recall, that distorted audio on the K3S is a symptom of a failure in the LPA on the RF Board. Contact [hidden email] to get some points to check. > > 73, > Don W3FPR > >> On 4/6/2020 1:43 PM, Rich wrote: >> Just to make sure that was a typo you said K2?? >> >> I did your test on my K3S and I am getting about 55 watts on the meter >> >> Any other ideas? >> >> Thank you so much >> > > > ______________________________________________________________ > 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 > Message delivered to [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 Message delivered to [hidden email] |
In reply to this post by Don Wilhelm
That's where the problem was in my 2 K3S's.
Ed.. AB4IQ -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Don Wilhelm Sent: Monday, April 6, 2020 1:09 PM To: Rich <[hidden email]>; Elecraft <[hidden email]> Subject: Re: [Elecraft] KPA100 and Audio Issue Rich, Well, since the KPA100 is an option for the K2 (and not for any other transceiver), I did not make a typo. Since you have the K3S, the 100 watt amplifier is the KPA3. That is why one has to be careful when specifying designations of options. As I recall, that distorted audio on the K3S is a symptom of a failure in the LPA on the RF Board. Contact [hidden email] to get some points to check. 73, Don W3FPR On 4/6/2020 1:43 PM, Rich wrote: > Just to make sure that was a typo you said K2?? > > I did your test on my K3S and I am getting about 55 watts on the meter > > Any other ideas? > > Thank you so much > ______________________________________________________________ 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 Message delivered to [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 Message delivered to [hidden email] |
In reply to this post by Bob McGraw - K4TAX
I always use 15.6v and with double heavy cable to minimise VD,
On 7/4/20 4:08 am, Bob McGraw K4TAX wrote: > I’d say that 10 - 12 volts is too low. The supply should be 13.8 to 14.8. > > Bob, K4TAX > > > Sent from my iPhone > >> On Apr 6, 2020, at 10:52 AM, Rich <[hidden email]> wrote: >> >> I am having an issue with distorted audio once the KPA100 kicks in at about 10-12v. >> >> The KPA100 is putting out 100 watts >> >> I have re-calibrated the radio with no change. >> >> I am testing with the hand mic and a dummy load. Which should eliminate any external devices causing it >> >> Any suggestions as to what can be causing this issue? >> >> Thanks >> >> Rich >> >> K3RWN >> >> ______________________________________________________________ >> 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 >> Message delivered to [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 > Message delivered to [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 Message delivered to [hidden email] |
Rich really meant WATTs.....
On 4/6/2020 5:54 PM, Adrian wrote: > I always use 15.6v and with double heavy cable to minimise VD, > > > On 7/4/20 4:08 am, Bob McGraw K4TAX wrote: >> I’d say that 10 - 12 volts is too low. The supply should be 13.8 to >> 14.8. >> >> Bob, K4TAX >> >> >> Sent from my iPhone >> >>> On Apr 6, 2020, at 10:52 AM, Rich <[hidden email]> wrote: >>> >>> I am having an issue with distorted audio once the KPA100 kicks in >>> at about 10-12v. >>> >>> The KPA100 is putting out 100 watts >>> >>> I have re-calibrated the radio with no change. >>> >>> I am testing with the hand mic and a dummy load. Which should >>> eliminate any external devices causing it >>> >>> Any suggestions as to what can be causing this issue? >>> >>> Thanks >>> >>> Rich >>> >>> K3RWN >>> >>> ______________________________________________________________ >>> 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 >>> Message delivered to [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 >> Message delivered to [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 > Message delivered to [hidden email] -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ______________________________________________________________ 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 Message delivered to [hidden email] |
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