KPA 1500 and receiver noise
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I am looking for possible causes of increased receive noise I
am experiencing whenever I turn on my KPA 1500 . I have always had this issue but at first disregarded it as maybe common mode noise but have since experimented a bit by connecting a dummy load to the receiver and producing the same results. The receiver is a K3s model and I have taken several opportunities to bond all equipment and tried ferrite #33 beads in several places with no change in results. Has anyone else on this site had the same problem. The noise is the greatest on 6 and 10 meters where it would show up as more of a problem as well with a +20-db noise on 6 meters and +10-db on 10 meters. Bob K0RKH -- Sent from: http://elecraft.365791.n2.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 Message delivered to [hidden email] |
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My 1500 had birdies which were reduced with adding load resistor to the 50 volt supply on the amp. Still present but much lower.
Dave wo2x Sent from my waxed string and tin cans. > On Dec 29, 2019, at 1:26 PM, K0RKH <[hidden email]> wrote: > > I am looking for possible causes of increased receive noise I > am experiencing whenever I turn on my KPA 1500 . I have always had this > issue but at first disregarded it as maybe common mode noise but have since > experimented a bit by connecting a dummy load to the receiver and producing > the same results. > The receiver is a K3s model and I have taken several > opportunities to bond all equipment and tried ferrite #33 beads in several > places with no change in results. > Has anyone else on this site had the same problem. The noise > is the greatest on 6 and 10 meters where it would show up as more of a > problem as well with a +20-db noise on 6 meters and +10-db on 10 meters. > Bob K0RKH > > > > -- > Sent from: http://elecraft.365791.n2.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 > 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] |
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In reply to this post by K0RKH
Thank You to the replies I have recieved on this subject. When
I get back home in a few days I will look for the electrical hash again with the fan on. I am guessing that this would point to the suggestion of some slight loading of the power supply to smooth out emitted noise. Bob K0RKH -- Sent from: http://elecraft.365791.n2.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 Message delivered to [hidden email] |
Re: KPA 1500 and receiver noise
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Hi Bob.
Contact support(at)elecraft.com and request the free KPA1500 power supply load resistor kit. They can also tell you if your amp S/N was manufactured before we started adding the load resistor to new units some time ago. 73, Eric /elecraft.com/ On 12/30/2019 8:12 AM, K0RKH wrote: > Thank You to the replies I have recieved on this subject. When > I get back home in a few days I will look for the electrical hash again with > the fan on. I am guessing that this would point to the suggestion of some > slight loading of the power supply to smooth out emitted noise. > > Bob K0RKH ______________________________________________________________ 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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Thank You very much for your personal reply .
I love the gear you guys produce and keep it in the forefront of my operating position. CW first and SSB when convienient. Thanks and Happy New Year Bob K0RKH ________________________________ From: Eric Swartz - WA6HHQ, Elecraft <[hidden email]> Sent: Monday, December 30, 2019 10:39 AM To: K0RKH <[hidden email]>; [hidden email] <[hidden email]> Subject: Re: [Elecraft] KPA 1500 and receiver noise Hi Bob. Contact support(at)elecraft.com and request the free KPA1500 power supply load resistor kit. They can also tell you if your amp S/N was manufactured before we started adding the load resistor to new units some time ago. 73, Eric elecraft.com On 12/30/2019 8:12 AM, K0RKH wrote: Thank You to the replies I have recieved on this subject. When I get back home in a few days I will look for the electrical hash again with the fan on. I am guessing that this would point to the suggestion of some slight loading of the power supply to smooth out emitted noise. Bob K0RKH ______________________________________________________________ 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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