I fully agree, eliminating EMI at the source is best. What if there are several EMI /RFI sources nearby? In my semiurban environment at night, I often have EMI in SSB BW 160m = >S8 , 80m=>S7, 40m=>S6 on a calibrated S-Meter ( S9=-73dBm/50uV@50Ohm( SWR mostly <2), 1 S-Unit(IARU) =6dB). QRN crushes in summer on 160 and 80m ( 2x36m Doublet @24m) push the spectrum baseline (AGC Mid) by 20 to 10dB easily.
Tnx, cu, vy 73 Andy HB9CVQ, DK2VQ, AK4IG https://www.qrz.com/db/HB9CVQ -----Original Message----- From: [email protected] <[email protected]> On Behalf Of David Gilbert via Elecraft Sent: Friday, July 17, 2026 9:59 PM To: [email protected] Subject: Re: [Elecraft] Noise Nuller Of course that's the ideal solution, and of course lots of people have done (or tried) exactly that and it often works. But I doubt very many people are going to have much luck getting their neighbor to replace their cheap solar converters with better ones, and I doubt many people are going to convince the owners of the adjacent condo to replace their cheap wall warts ... especially since lots of neighbors aren't all that happy to have hams next door in the first place. And hams that live in urban areas with industrial businesses nearby aren't going to get very far at all. If it was as simple as you pretend, rig manufacturers wouldn't have bothered to build all sorts of noise reduction features into their equipment. Dave AB7E On 7/17/2026 10:33 AM, Bob McGraw via Elecraft wrote: > Has anyone given thoughts or efforts to finding and addressing the > source of the noise? All of these electronic concepts are great, but > would not finding, reducing or eliminating the source be more > effective. I seem to think so from my personal experience of > tracking down noise and resolving same. > > Start with the radio on a battery as the power source. Then drop the > mains power. Note the noise level. Then restore mains power and > observe the noise. That my friends is coming from your house. This > should be easy to find and correct. Power distribution systems noise > are more challenging to find and correct. But with a bit of > cooperation from the power company that can be accomplished as well. > > From my experience and work, my noise level on most all bands, 160M - > 6M, is S-2 to S-3, excluding atmospheric noise of distant lightning. > Winter will correct that. > > 73 > > Bob, K4TAX > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
