Re: [Elecraft] KPA1500 and noise
Need more details on what your antenna system is and especially what is connected to antenna 1 and 2 on the amp. Any antenna switches, etc. Dave wo2x -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of w5...@comcast.net Sent: Friday, May 8, 2020 8:28 PM To: Elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 and noise Recently I have noticed that I have a very high noise lever at my QTH, which I have never had. Today as I was shutting down my station I turned off the KPA1500 first, and my noise dropped from S7 to S1 instantly. I turned the Amp back on and the noise came back. Have any of you ever observed this? Thanks in advance Ronnie W5SUM __ 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] KPA1500 and noise
only one antenna hooked to it, and that’s a sommer XP808 log fed yagi. No switches.! Ronnie W5SUM -Original Message- From: rocke...@gmail.com Sent: Friday, May 08, 2020 7:35 PM To: w5...@comcast.net ; Elecraft@mailman.qth.net Subject: RE: [Elecraft] KPA1500 and noise Need more details on what your antenna system is and especially what is connected to antenna 1 and 2 on the amp. Any antenna switches, etc. Dave wo2x -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of w5...@comcast.net Sent: Friday, May 8, 2020 8:28 PM To: Elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 and noise Recently I have noticed that I have a very high noise lever at my QTH, which I have never had. Today as I was shutting down my station I turned off the KPA1500 first, and my noise dropped from S7 to S1 instantly. I turned the Amp back on and the noise came back. Have any of you ever observed this? Thanks in advance Ronnie W5SUM __ 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] KPA1500 and noise
Hi Ronnie I do not have a KPA1500 (only a KPA500) but I recall seeing posts from time to time about noise emanating from KPA1500's. I think you will need to check in with Elecraft on the issue. 73 Barry VK2BJ On Sat, 9 May 2020 at 10:28, wrote: > Recently I have noticed that I have a very high noise lever at my QTH, > which > I have never had. Today as I was shutting down my station I turned off > the > KPA1500 first, and my noise dropped from S7 to S1 instantly. > > I turned the Amp back on and the noise came back. Have any of you ever > observed this? > > Thanks in advance > > Ronnie W5SUM > > __ > 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 vk...@optusnet.com.au > __ 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] KPA1500 and noise
I don't recall the details but have you read the posts by the Elecraft guys some weeks ago related to excess noise and loose grounding nuts (on or near the SO239 connectors if I recall correctly)? My KPA1500 creates a tiny amount of additional noise on 6 m when switched to "operate" but nothing discernible elsewhere. 73, Peter. -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of w5...@comcast.net Sent: Saturday, 9 May 2020 8:41 AM To: rocke...@gmail.com; Elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA1500 and noise only one antenna hooked to it, and that’s a sommer XP808 log fed yagi. No switches.! Ronnie W5SUM -Original Message- From: rocke...@gmail.com Sent: Friday, May 08, 2020 7:35 PM To: w5...@comcast.net ; Elecraft@mailman.qth.net Subject: RE: [Elecraft] KPA1500 and noise Need more details on what your antenna system is and especially what is connected to antenna 1 and 2 on the amp. Any antenna switches, etc. Dave wo2x -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of w5...@comcast.net Sent: Friday, May 8, 2020 8:28 PM To: Elecraft@mailman.qth.net Subject: [Elecraft] KPA1500 and noise Recently I have noticed that I have a very high noise lever at my QTH, which I have never had. Today as I was shutting down my station I turned off the KPA1500 first, and my noise dropped from S7 to S1 instantly. I turned the Amp back on and the noise came back. Have any of you ever observed this? Thanks in advance Ronnie W5SUM __ 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 p.h...@curtin.edu.au __ 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] KPA1500 and noise
Mine had noise on 80 meters. Elecraft sent me a load resistor to install in the power supply across the 50 VDC terminals. Knocked the birdies down to the noise floor. I also foo d there is a connection from the minus terminal to the chassis that was loose. Serial number 423 and it has been working fine since. Dave wo2x Sent from my waxed string and tin cans. > On May 8, 2020, at 10:33 PM, Peter Hall wrote: > > I don't recall the details but have you read the posts by the Elecraft guys > some weeks ago related to excess noise and loose grounding nuts (on or near > the SO239 connectors if I recall correctly)? > > My KPA1500 creates a tiny amount of additional noise on 6 m when switched to > "operate" but nothing discernible elsewhere. > > 73, Peter. > > -Original Message- > From: elecraft-boun...@mailman.qth.net On > Behalf Of w5...@comcast.net > Sent: Saturday, 9 May 2020 8:41 AM > To: rocke...@gmail.com; Elecraft@mailman.qth.net > Subject: Re: [Elecraft] KPA1500 and noise > > only one antenna hooked to it, and that’s a sommer XP808 log fed yagi. No > switches.! > > Ronnie W5SUM > > -Original Message- > From: rocke...@gmail.com > Sent: Friday, May 08, 2020 7:35 PM > To: w5...@comcast.net ; Elecraft@mailman.qth.net > Subject: RE: [Elecraft] KPA1500 and noise > > Need more details on what your antenna system is and especially what is > connected to antenna 1 and 2 on the amp. > Any antenna switches, etc. > > Dave wo2x > > > > -Original Message- > From: elecraft-boun...@mailman.qth.net On > Behalf Of w5...@comcast.net > Sent: Friday, May 8, 2020 8:28 PM > To: Elecraft@mailman.qth.net > Subject: [Elecraft] KPA1500 and noise > > Recently I have noticed that I have a very high noise lever at my QTH, which > I have never had. Today as I was shutting down my station I turned off the > KPA1500 first, and my noise dropped from S7 to S1 instantly. > > I turned the Amp back on and the noise came back. Have any of you ever > observed this? > > Thanks in advance > > Ronnie W5SUM > > __ > 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 p.h...@curtin.edu.au > __ > 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] KPA1500 and noise
On 5/8/2020 5:28 PM, w5...@comcast.net wrote: I turned the Amp back on and the noise came back. Is your station properly bonded? It should be, for a lot of reasons, especially noise and safety. It's also the LAW! Study this tutorial. http://k9yc.com/GroundingAndAudio.pdf On 5/8/2020 5:41 PM, w5...@comcast.net wrote: > only one antenna hooked to it, and that’s a sommer XP808 log fed yagi. You should have a very good common mode choke at the feedpoint. Guidelines here. http://k9yc.com/2018Cookbook.pdf 73, Jim K9YC __ 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] KPA1500 and noise
Folks, This was the thread I half recalled: excess noise on 10 m. See reply from Eric re S0239 washers. May not be applicable to present case (not sure which bands are involved) but worth a check. http://elecraft.365791.n2.nabble.com/KPA1500-RFI-on-10-Meters-td7657067.html#a7657213 73, Peter. -Original Message- From: Dave Sent: Saturday, 9 May 2020 10:43 AM To: Peter Hall Cc: w5...@comcast.net; Elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA1500 and noise Mine had noise on 80 meters. Elecraft sent me a load resistor to install in the power supply across the 50 VDC terminals. Knocked the birdies down to the noise floor. I also foo d there is a connection from the minus terminal to the chassis that was loose. Serial number 423 and it has been working fine since. Dave wo2x Sent from my waxed string and tin cans. > On May 8, 2020, at 10:33 PM, Peter Hall wrote: > > I don't recall the details but have you read the posts by the Elecraft guys > some weeks ago related to excess noise and loose grounding nuts (on or near > the SO239 connectors if I recall correctly)? > > My KPA1500 creates a tiny amount of additional noise on 6 m when switched to > "operate" but nothing discernible elsewhere. > > 73, Peter. > > -Original Message- > From: elecraft-boun...@mailman.qth.net > On Behalf Of w5...@comcast.net > Sent: Saturday, 9 May 2020 8:41 AM > To: rocke...@gmail.com; Elecraft@mailman.qth.net > Subject: Re: [Elecraft] KPA1500 and noise > > only one antenna hooked to it, and that’s a sommer XP808 log fed yagi. No > switches.! > > Ronnie W5SUM > > -Original Message- > From: rocke...@gmail.com > Sent: Friday, May 08, 2020 7:35 PM > To: w5...@comcast.net ; Elecraft@mailman.qth.net > Subject: RE: [Elecraft] KPA1500 and noise > > Need more details on what your antenna system is and especially what is > connected to antenna 1 and 2 on the amp. > Any antenna switches, etc. > > Dave wo2x > > > > -Original Message- > From: elecraft-boun...@mailman.qth.net > On Behalf Of w5...@comcast.net > Sent: Friday, May 8, 2020 8:28 PM > To: Elecraft@mailman.qth.net > Subject: [Elecraft] KPA1500 and noise > > Recently I have noticed that I have a very high noise lever at my QTH, > which I have never had. Today as I was shutting down my station I > turned off the > KPA1500 first, and my noise dropped from S7 to S1 instantly. > > I turned the Amp back on and the noise came back. Have any of you ever > observed this? > > Thanks in advance > > Ronnie W5SUM > > __ > 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 > p.h...@curtin.edu.au > __ > 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] KPA1500 and noise
Peter thanks 10M IS the band in question! Bonding is good, using 1/2” wide braided copper strAt for K3 and the power supply and kpa1500 are bonded together with the same! All equip is bonded to a 10” X 24” copper plate. That plate has #6 hard drawn copper cadwelded to it, the #6 going through the floor of shack only 36” and is cadwelded to a 8’ copper clad ground rod. I’ll check the SO239’s today Thanks all Ronnie W5Sum Sent from my iPhone > On May 9, 2020, at 4:43 AM, Peter Hall wrote: > > Folks, > > This was the thread I half recalled: excess noise on 10 m. See reply from > Eric re S0239 washers. May not be applicable to present case (not sure which > bands are involved) but worth a check. > > http://elecraft.365791.n2.nabble.com/KPA1500-RFI-on-10-Meters-td7657067.html#a7657213 > > 73, Peter. > > > -Original Message- > From: Dave > Sent: Saturday, 9 May 2020 10:43 AM > To: Peter Hall > Cc: w5...@comcast.net; Elecraft@mailman.qth.net > Subject: Re: [Elecraft] KPA1500 and noise > > Mine had noise on 80 meters. Elecraft sent me a load resistor to install in > the power supply across the 50 VDC terminals. Knocked the birdies down to the > noise floor. I also foo d there is a connection from the minus terminal to > the chassis that was loose. > > Serial number 423 and it has been working fine since. > > Dave wo2x > > Sent from my waxed string and tin cans. > >> On May 8, 2020, at 10:33 PM, Peter Hall wrote: >> >> I don't recall the details but have you read the posts by the Elecraft guys >> some weeks ago related to excess noise and loose grounding nuts (on or near >> the SO239 connectors if I recall correctly)? >> >> My KPA1500 creates a tiny amount of additional noise on 6 m when switched to >> "operate" but nothing discernible elsewhere. >> >> 73, Peter. >> >> -Original Message- >> From: elecraft-boun...@mailman.qth.net >> On Behalf Of w5...@comcast.net >> Sent: Saturday, 9 May 2020 8:41 AM >> To: rocke...@gmail.com; Elecraft@mailman.qth.net >> Subject: Re: [Elecraft] KPA1500 and noise >> >> only one antenna hooked to it, and that’s a sommer XP808 log fed yagi. No >> switches.! >> >> Ronnie W5SUM >> >> -Original Message- >> From: rocke...@gmail.com >> Sent: Friday, May 08, 2020 7:35 PM >> To: w5...@comcast.net ; Elecraft@mailman.qth.net >> Subject: RE: [Elecraft] KPA1500 and noise >> >> Need more details on what your antenna system is and especially what is >> connected to antenna 1 and 2 on the amp. >> Any antenna switches, etc. >> >> Dave wo2x >> >> >> >> -Original Message- >> From: elecraft-boun...@mailman.qth.net >> On Behalf Of w5...@comcast.net >> Sent: Friday, May 8, 2020 8:28 PM >> To: Elecraft@mailman.qth.net >> Subject: [Elecraft] KPA1500 and noise >> >> Recently I have noticed that I have a very high noise lever at my QTH, >> which I have never had. Today as I was shutting down my station I >> turned off the >> KPA1500 first, and my noise dropped from S7 to S1 instantly. >> >> I turned the Amp back on and the noise came back. Have any of you ever >> observed this? >> >> Thanks in advance >> >> Ronnie W5SUM >> >> __ >> 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 >> p.h...@curtin.edu.au >> __ >> 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] KPA1500 and Noise
I'm only using port 1. I did find the ground in my circuit breaker box, well.. not loose really.. but got a couple of turns on it.. it actually made a 1 DB difference in the noise. May be on to something here. thanks for all the suggestions guys Ronnie -Original Message- From: Dauer, Edward Sent: Saturday, May 09, 2020 10:05 AM To: elecraft@mailman.qth.net ; w5...@comcast.net Subject: KPA1500 and Noise Which of the amp's antenna outputs are you using? When the KPA1500 is switched off the antenna is internally defaulted to connector number one. So if the noise is coming in via an antenna connected to number two, it should drop when power to the amp is turned off. Ted, KN1CBR -- Message: 6 Date: Fri, 8 May 2020 19:28:24 -0500 From: To: Subject: [Elecraft] KPA1500 and noise Message-ID: <362C6C03ECC34C00992DDFCC51D05C03@MININTMC1HLDC> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Recently I have noticed that I have a very high noise lever at my QTH, which I have never had. Today as I was shutting down my station I turned off the KPA1500 first, and my noise dropped from S7 to S1 instantly. I turned the Amp back on and the noise came back. Have any of you ever observed this? Thanks in advance Ronnie W5SUM -- ** __ 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
