Re: [Elecraft] Strange RFI question
Hi, Noise spaced 61kHz apart to me means it's from an Ethernet LAN. Look at these files: http://ab2tc.com/ethernoise.png http://ab2tc.com/ethernoise.mp3 There is one at the center and one just above the frequency of the cross-hair cursor about 61kHz higher. The mp3 file is a recording from the K3 in USB mode tuned to the center frequency. They are not all from my own LAN but mostly from my neighbors. I used to have much worse interference from my LAN but a combination of ferrites and largely switching to wireless, my house is now almost clean of this type of noise. Yes, the panadapter is an eye opener for sure. AB2TC - Knut W2RMS wrote > Hello everyone! > I'm not sure if this is the correct forum for this sort of a question but > i figured i'd give it a shot. > I've been going out of my mind with this strange signal pattern i've been > seeing on my new panadapter connected to my new K3. > I first saw it on 20 meters. It seems to be the same signal pattern, > spaced evenly, at 61 kHz intervals. > Something tells me that it could very well be outside of my shack. I've > got the street power lines 15 feet in front of my house, with a big > transformer on top of a pole. > I just took a video of the whole thing and you can also hear the sound of > it, especially while i tune it up and down. > Here's a link to the video file in my DropBox: > https://dl.dropboxusercontent.com/u/111549/rfi/strange_rfi.wmv > Sorry for the format. This screen capture program only does Windows Media > Video. > > I've gone to a point where i've disconnected everything in the shack. > Literally. And i could still hear it. > My Yaesu 857D also hears it, with the same antenna hooked up to it, so > that tells me its not my K3 or the panadapter (for that matter). > I also tried hooking up another antenna (i have a home made fan dipole) > and i can still hear it. So its not the antenna (right?). > > I'm very open to any suggestions as to what to do? How to narrow it down? > > Thanks a bunch in advance! > > Slava, W2RMS > > P.S. I almost wish i didn't have the panadapter, so i wouldn't even know > its there... :-( > __ > -- View this message in context: http://elecraft.365791.n2.nabble.com/K7YTM-Elecraft-K3-Panadapter-has-been-sold-tp7586901p7586935.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: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] Strange RFI question
Slava, I agree with Fred that this is noise from one of the many noise generating devices in our houses today. Square waves are generated by most every piece of electronics equipment in the house, and most consumer products make no attempt at containing them. We really haven't defended our spectrum from the local noise sources very well. The spectrum is actually pretty quiet in your location compared to mine. After about 10 years away from ham radio in the 80's, I came back and was surprised how noisy the spectrum had become. The addition of panadapters visually confirms what we hear. For relief, I occasionally carry one of my homebrew DC receivers away from cell phones, computers, etc. just to listen to the beauty of RF signals on a clear cold night. It is like the difference between fine wine, and Ripple! Mark KE6BB From: Slava Baytalskiy Sent: Wed, Apr 9, 2014 at 08:16 AM To: Elecraft List Subject: Re: [Elecraft] Strange RFI question Hi everyone!Sorry about the video not showing up.Not sure why i didn't think of just uploading it to YouTube.So, here are two links:This one i took with my iPhone. The audio is very low though - http://youtu.be/DOZHHxjDhDIThis one is the original that i took with the screen recorder - http://youtu.be/Qhs1G9YS5k0Please take a peek and see if you could give me some ideas.As i've said earlier this is very pronounced on 20 meters. The signals in question are repeating every 61 kHz throughout the band. So its not just one signal. And they don't sound like you normal hum or buzz.Thanks in advance!Slava, W2RMSOn Apr 8, 2014, at 9:34 PM, Slava Baytalskiy wrote:> Hello everyone!> I'm not sure if this is the correct forum for this sort of a question but i figured i'd give it a shot.> I've been going out of my mind with this strange signal pattern i've been seeing on my new panadapter connected to my new K3.> I first saw it on 20 meters. It seems to be the same signal pattern, spaced evenly, at 61 kHz intervals.> Something tells me that it could very well be outside of my shack. I've got the street power lines 15 feet in front of my house, with a big transformer on top of a pole.> I just took a video of the whole thing and you can also hear the sound of it, especially while i tune it up and down.> Here's a link to the video file in my DropBox: https://dl.dropboxusercontent.com/u/111549/rfi/strange_rfi.wmv> Sorry for the format. This screen capture program only does Windows Media Video.> > I've gone to a point where i've disconnected everything in the shack. Literally. And i could still hear it.> My Yaesu 857D also hears it, with the same antenna hooked up to it, so that tells me its not my K3 or the panadapter (for that matter).> I also tried hooking up another antenna (i have a home made fan dipole) and i can still hear it. So its not the antenna (right?).> > I'm very open to any suggestions as to what to do? How to narrow it down?> > Thanks a bunch in advance!> > Slava, W2RMS> > P.S. I almost wish i didn't have the panadapter, so i wouldn't even know its there... :-(__Elecraft mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.htmlMessage delivered to rv6am...@yahoo.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] Strange RFI question
Hi everyone! Sorry about the video not showing up. Not sure why i didn't think of just uploading it to YouTube. So, here are two links: This one i took with my iPhone. The audio is very low though - http://youtu.be/DOZHHxjDhDI This one is the original that i took with the screen recorder - http://youtu.be/Qhs1G9YS5k0 Please take a peek and see if you could give me some ideas. As i've said earlier this is very pronounced on 20 meters. The signals in question are repeating every 61 kHz throughout the band. So its not just one signal. And they don't sound like you normal hum or buzz. Thanks in advance! Slava, W2RMS On Apr 8, 2014, at 9:34 PM, Slava Baytalskiy wrote: > Hello everyone! > I'm not sure if this is the correct forum for this sort of a question but i > figured i'd give it a shot. > I've been going out of my mind with this strange signal pattern i've been > seeing on my new panadapter connected to my new K3. > I first saw it on 20 meters. It seems to be the same signal pattern, spaced > evenly, at 61 kHz intervals. > Something tells me that it could very well be outside of my shack. I've got > the street power lines 15 feet in front of my house, with a big transformer > on top of a pole. > I just took a video of the whole thing and you can also hear the sound of it, > especially while i tune it up and down. > Here's a link to the video file in my DropBox: > https://dl.dropboxusercontent.com/u/111549/rfi/strange_rfi.wmv > Sorry for the format. This screen capture program only does Windows Media > Video. > > I've gone to a point where i've disconnected everything in the shack. > Literally. And i could still hear it. > My Yaesu 857D also hears it, with the same antenna hooked up to it, so that > tells me its not my K3 or the panadapter (for that matter). > I also tried hooking up another antenna (i have a home made fan dipole) and i > can still hear it. So its not the antenna (right?). > > I'm very open to any suggestions as to what to do? How to narrow it down? > > Thanks a bunch in advance! > > Slava, W2RMS > > P.S. I almost wish i didn't have the panadapter, so i wouldn't even know its > there... :-( __ 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] Strange RFI question
Slava, I can't make the link work but regularly spaced signals are a classic sign of a Switched Mode Power Supply [SMPS]. I host the local wireless company's RAP for our neighborhood on my tower, in return we get the backhaul speed [17 Mbps] for free ... yes, we power it. Really great for Andrea's Netflix addiction. They recently replaced the gear, and it is now powered by a UPS in our shed with an SMPS with raucous noise peaks every 26 KHz +/-, they move around a bit. Since the wireless company seems to be preoccupied with getting new customers, I'm going to wind a couple of toroid chokes and see if I can fix this. Wall warts are in most cases these days SMPS. So are LED lamp power supplies. I'll send you a screen shot of mine if you'd like, their UPS is connected to a cable to the top of the tower and down to the router at the bottom ... resembles a 160 Inv-L. 73, Fred K6DGW - Northern California Contest Club - CU in the 2014 Cal QSO Party 4-5 Oct 2014 - www.cqp.org On 4/8/2014 6:34 PM, Slava Baytalskiy wrote: Hello everyone! I'm not sure if this is the correct forum for this sort of a question but i figured i'd give it a shot. I've been going out of my mind with this strange signal pattern i've been seeing on my new panadapter connected to my new K3. I first saw it on 20 meters. It seems to be the same signal pattern, spaced evenly, at 61 kHz intervals. Something tells me that it could very well be outside of my shack. I've got the street power lines 15 feet in front of my house, with a big transformer on top of a pole. I just took a video of the whole thing and you can also hear the sound of it, especially while i tune it up and down. Here's a link to the video file in my DropBox: https://dl.dropboxusercontent.com/u/111549/rfi/strange_rfi.wmv Sorry for the format. This screen capture program only does Windows Media Video. I've gone to a point where i've disconnected everything in the shack. Literally. And i could still hear it. My Yaesu 857D also hears it, with the same antenna hooked up to it, so that tells me its not my K3 or the panadapter (for that matter). I also tried hooking up another antenna (i have a home made fan dipole) and i can still hear it. So its not the antenna (right?). I'm very open to any suggestions as to what to do? How to narrow it down? Thanks a bunch in advance! Slava, W2RMS P.S. I almost wish i didn't have the panadapter, so i wouldn't even know its there... :-( __ 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 k6...@foothill.net - No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4355 / Virus Database: 3882/7318 - Release Date: 04/08/14 __ 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] Strange RFI question
Hello everyone! I'm not sure if this is the correct forum for this sort of a question but i figured i'd give it a shot. I've been going out of my mind with this strange signal pattern i've been seeing on my new panadapter connected to my new K3. I first saw it on 20 meters. It seems to be the same signal pattern, spaced evenly, at 61 kHz intervals. Something tells me that it could very well be outside of my shack. I've got the street power lines 15 feet in front of my house, with a big transformer on top of a pole. I just took a video of the whole thing and you can also hear the sound of it, especially while i tune it up and down. Here's a link to the video file in my DropBox: https://dl.dropboxusercontent.com/u/111549/rfi/strange_rfi.wmv Sorry for the format. This screen capture program only does Windows Media Video. I've gone to a point where i've disconnected everything in the shack. Literally. And i could still hear it. My Yaesu 857D also hears it, with the same antenna hooked up to it, so that tells me its not my K3 or the panadapter (for that matter). I also tried hooking up another antenna (i have a home made fan dipole) and i can still hear it. So its not the antenna (right?). I'm very open to any suggestions as to what to do? How to narrow it down? Thanks a bunch in advance! Slava, W2RMS P.S. I almost wish i didn't have the panadapter, so i wouldn't even know its there... :-( __ 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
