Re: [Elecraft] KPA 500 Attenuated Receive Signals
I had the exact same problem with my KPA500. I inadvertently left it connected in a lightning storm in the Caribbean and, after some diagnosis on my RF bench, I found that the PIN diodes on the receive side were blown. Replacing them cured the problem. While in there be advised that there is an upgrade kit for some components in that circuit. Contact Elecraft techs for more info. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ email: b...@wjschmidt.com -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Barry Simpson Sent: Sunday, September 8, 2019 1:34 AM To: Elecraft Mailing List Subject: [Elecraft] KPA 500 Attenuated Receive Signals My KPA 500, which is several years old, has just developed an issue which so far I have been unable to resolve. What has happened is that when I put the amplifier into OPER, the received signal strength drops by several S units. It transmits normally and also receives normally in STBY. The issue occurred when I was changing rigs to use with the KPA500. Specifically I connected a Ten Tec Omni 6 but I cannot see how that could have caused the issue. However, the KPA500 now exhibits the same issue with my TS990 which it never has before. I believe that some considerable time ago, I did experience a similar situation and after reading all the manuals etc I found a way to resolve it. However, I have read the manual until I am blue in the face but I cannot find an answer this time. Of course I may have initiated a fault in the KPA500 but I would be surprised as it has taken all the mistakes I have thrown at it over the years and it has not so much as blinked. Any suggestions on how to sort the issue out, or what damage I might have caused to the switching circuitry, would be appreciated. Thanks in advance. Barry Simpson VK2BJ __ 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 b...@wjschmidt.com --- This email has been checked for viruses by AVG. https://www.avg.com __ 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] KPA 500 Attenuated Receive Signals
I had the issue with my 1500 several months ago and it was traced to one of the PIN diodes. Good news is after trip to the left coast for repair and all ECO updates applied the amp has been perfect. Dave wo2x -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Barry Simpson Sent: Sunday, September 8, 2019 8:22 AM To: donw...@embarqmail.com Cc: Elecraft Mailing List Subject: Re: [Elecraft] KPA 500 Attenuated Receive Signals Thanks Don That's what I thought. I will email them tomorrow. 73 Barry VK2BJ On Sun, 8 Sep 2019 at 21:36, Don Wilhelm wrote: > Barry, > > I think you may find a problem in the KPA500 T/R switch area. > Email supp...@elecraft.com for further checks and resolution. > > 73, > Don W3FPR > > On 9/8/2019 2:34 AM, Barry Simpson wrote: > > My KPA 500, which is several years old, has just developed an issue > > which so far I have been unable to resolve. > > > > What has happened is that when I put the amplifier into OPER, the > received > > signal strength drops by several S units. It transmits normally and > > also receives normally in STBY. > > > __ 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 rocke...@gmail.com __ 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] KPA 500 Attenuated Receive Signals
Thanks Don That's what I thought. I will email them tomorrow. 73 Barry VK2BJ On Sun, 8 Sep 2019 at 21:36, Don Wilhelm wrote: > Barry, > > I think you may find a problem in the KPA500 T/R switch area. > Email supp...@elecraft.com for further checks and resolution. > > 73, > Don W3FPR > > On 9/8/2019 2:34 AM, Barry Simpson wrote: > > My KPA 500, which is several years old, has just developed an issue which > > so far I have been unable to resolve. > > > > What has happened is that when I put the amplifier into OPER, the > received > > signal strength drops by several S units. It transmits normally and also > > receives normally in STBY. > > > __ 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] KPA 500 Attenuated Receive Signals
Barry, I think you may find a problem in the KPA500 T/R switch area. Email supp...@elecraft.com for further checks and resolution. 73, Don W3FPR On 9/8/2019 2:34 AM, Barry Simpson wrote: My KPA 500, which is several years old, has just developed an issue which so far I have been unable to resolve. What has happened is that when I put the amplifier into OPER, the received signal strength drops by several S units. It transmits normally and also receives normally in STBY. __ 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
[Elecraft] KPA 500 Attenuated Receive Signals
My KPA 500, which is several years old, has just developed an issue which so far I have been unable to resolve. What has happened is that when I put the amplifier into OPER, the received signal strength drops by several S units. It transmits normally and also receives normally in STBY. The issue occurred when I was changing rigs to use with the KPA500. Specifically I connected a Ten Tec Omni 6 but I cannot see how that could have caused the issue. However, the KPA500 now exhibits the same issue with my TS990 which it never has before. I believe that some considerable time ago, I did experience a similar situation and after reading all the manuals etc I found a way to resolve it. However, I have read the manual until I am blue in the face but I cannot find an answer this time. Of course I may have initiated a fault in the KPA500 but I would be surprised as it has taken all the mistakes I have thrown at it over the years and it has not so much as blinked. Any suggestions on how to sort the issue out, or what damage I might have caused to the switching circuitry, would be appreciated. Thanks in advance. Barry Simpson VK2BJ __ 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
