[P3] Discoveries
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The post by Gary, VE1RGB, about unexpected benefits of having the P3
panadapter struck a chord with me worth sharing. I have what appears to be a local noise source that I knew previously moved around a bit, but I thought it was intermittent. With the P3 just hooked up a few days ago, I now can see that noise not only is always on, but it also moves around a lot more than I thought. Unless I had been spinning the dial of the K3 all over the band(s), I'd never have realized this without the panadapter. The added knowledge has inspired me to haul out the little KX1 and handheld loop antenna and go noise sniffing. Too bad I can't as easily tote the P3 along, but I'm sure tickled with the many unexpected benefits of having such a wonderful addition to the Elecraft lineup. 73, Dale -K6PJV ______________________________________________________________ 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 |
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I can second that!
As soon as I got the P3 working I realized that the annoying buzz I had noticed occasionally as I tuned 20 Meters was actually a nasty, wide 20db noise source every 50 Khz. It looked so bad on the P3 that it got me motivated to check it out. After a bit of disconnecting things here in the house before I was going to start flipping fuses I disconnected my u-Verse modem and killed the noise. Then with the modem running again I started disconnecting connections - ethernet, data in/out and phone connection. By rerouting the phone line I was able to drop it about 10db. Still there but better and now I have a roadmap to work on as much of the remainder as I can. It's amazing how what seemed like a minor annoyance became an obvious problem when it shows up on the scope! BTW, has anyone noticed the very interesting waterfall pictograms created by the Chinese radar just below 40 meters? Rick K6LE On 8/16/2010, at 9:46 , dalekretzer wrote: > The post by Gary, VE1RGB, about unexpected benefits of having the P3 > panadapter struck a chord with me worth sharing. > > I have what appears to be a local noise source that I knew previously > moved around a bit, but I thought it was intermittent. With the P3 just > hooked up a few days ago, I now can see that noise not only is always > on, but it also moves around a lot more than I thought. Unless I had > been spinning the dial of the K3 all over the band(s), I'd never have > realized this without the panadapter. > > The added knowledge has inspired me to haul out the little KX1 and > handheld loop antenna and go noise sniffing. Too bad I can't as easily > tote the P3 along, but I'm sure tickled with the many unexpected > benefits of having such a wonderful addition to the Elecraft lineup. > > 73, Dale -K6PJV ______________________________________________________________ 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 |
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In reply to this post by dalekretzer
On Mon, 16 Aug 2010 09:46:25 -0700, dalekretzer wrote:
>The post by Gary, VE1RGB, about unexpected benefits of having the P3 >panadapter struck a chord with me worth sharing. Yes. RFI consultant Mike Martin recently posted a note that he's now using a P3 and K3 as part of his RFI chasing kit. I intend to do the same with mine. Connected to a suitable antenna, it's a powerful (and portable) tool. 73, Jim Brown K9YC ______________________________________________________________ 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 |
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> Yes. RFI consultant Mike Martin recently posted a note that he's now
> using a P3 and K3 as part of his RFI chasing kit. I intend to do the > same with mine. Connected to a suitable antenna, it's a powerful (and > portable) tool. Jim, similar setup here for chasing down switch-mode noise in the surrounding neighborhood. For the past eighteen months, I've been using the K3 with gel cell, SDR-IQ, netbook PC, SpectraVue software, and Palstar rotating loop antenna with the tropical band loop. Most of my switch-mode noise is pronounced between 2-7 MHz. The loop will resonate anywhere between 160m and 40m. Although this set-up works very well, the next step is to eliminate the K3 and use only the SDR-IQ with netbook PC + loop. This should significantly reduce the package size and weight for my treks in the neighborhood. Since the SDR-IQ is powered by the netbook PC, it also eliminates an external battery power source required for the K3 and P3. The results with SpectraVue are self-documenting with fast screen captures. This has helped when showing problems to the neighbors and if necessary, its excellent supporting evidence if filing an RFI/EMI complaint with the FCC. The loop antenna's directivity up through 40m is so sharp that most switch-mode noise sources can be localized to one part of the house from street distance. So, although the K3 and P3 would be effective as a noise detection tool, I think a netbook PC with SDR-IQ would be more effective for noise identification when considering the ability to quickly save screen captures to disc, as well as size/weight of the gear package needed while on foot. Paul, W9AC ______________________________________________________________ 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 |
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On Tue, 17 Aug 2010 11:48:41 -0400, Paul Christensen wrote:
>So, although the K3 and P3 would be effective as a noise detection tool, I >think a netbook PC with SDR-IQ would be more effective for noise >identification when considering the ability to quickly save screen captures >to disc, as well as size/weight of the gear package needed while on foot. All great observations. Thanks Paul. 73, Jim K9YC ______________________________________________________________ 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 |
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In reply to this post by Rick Prather-2
I have a blip on the panadapter every ~60kHz over a very wide bandwidth. It is worst on the 15m band. It appears to be coming from my Verizon supplied Ethernet router possibly aided by a Gigabit switch just next to it. It is partly picked up by my antenna, but inadequate shielding in my MFJ tuner/SWR meter/antenna switch helps make it worse. I have tried clip-on ferrites on every wire coming out of the router, including the power supply, to no avail. Does anybody have any insight on what on Ethernet is going on at approximately the 60kHz rate?
AB2TC - Knut
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On Tue, 17 Aug 2010 10:06:47 -0700 (PDT), ab2tc wrote:
>I have tried clip-on ferrites on >every wire coming out of the router, Clip on ferrites are not effective at HF unless you wind multiple turns through them. Multi-turn ferrite chokes ARE effective. Study http://audiosystemsgroup.com/RFI-Ham.pdf 73, Jim Brown K9YC ______________________________________________________________ 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 |
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Hi,
I am painfully aware of that. Clip-ons in this case was the only practical thing to try. AB2TC - Knut
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On Tue, 17 Aug 2010 11:51:59 -0700 (PDT), ab2tc wrote:
>I am painfully aware of that. Clip-ons in this case was the only practical >thing to try. Clip-ons come in more than one size. Larger ones allow multiple turns. 73, Jim K9YC ______________________________________________________________ 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 |
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