Hi Mike and Gang, Contrary to what I was told this morning the RFI has been eliminated and the ground wire was indeed the cause of the RFI. It was arcing to something up high on the pole and the supe
Today I tracked down new RFI at my QTH on 160 meters. I was able to hear the RFI from my driveway using my portable flag with the DX Engineering preamp and it indicated the RFI was arriving from the
Hi Mike (W9IP), Are you able to see my youtube video as everything shown in my video is in the frequency domain. The top display is the RF spectrum display with a waterfall of it right below, and the
Hi Lee, I've been involved with a few different industrial RFI issues involving VFDs where we installed a commercial power line filter on the 3 phase input power feed to the VFD and it resolved the p
Hi Rick, Sorry that my last message was blank as I typed it on my cell phone and then accidentally deleted the text prior to hitting the send key. You can use your MF/HF loop to do some triangulation
Hi Frank, Thanks for mentioning my portable flag, and that's the way to go to get close to the area of the suspect pole but I didn't want to toot my own horn. It really is an easy antenna to build an
Frank, Great comment about the electric fence, and I previously dealt with an electric fence case at W9RE and it indeed had a rate of approximately 1 second. It was a very brief discharge every secon
Rick, When I mentioned using an AM radio with a 3 or 4 element yagi when within 0.25 miles of the source I should have said thats up on VHF (like 136 or 146 MHz, etc.) if its really power line noise
Hi Richard, I never stop thinking, and you originally said you were encountering 120 Hz noise bursts but I don't know how you determined it had 120 Hz component. As Frank mentioned the approximate 1
Richard, One last comment. I guess an electric fence might also use ac just stepped up along with a current limit resistor and then just have it active for a brief amount of time every second to allo
Hi Richard, Great recording. Definitely does not sound like electric fence and I would initially say its poweline noise (listening on my phone) and not a regular pattern at all but when I get some fr
Hi Richard, I tried sending this early today but my attachments appeared too big, so here it is with reduced file size attachments. I'm going to stick my neck out and post the following comments whic
Hi Rick, Here is a link to one of my videos showing what typical electric fence RFI sounds like: https://youtu.be/M99kyixyLnc Here is a link to another hams video (EI4GYB) showing his electric fence
I just uploaded a youtube video demonstrating a feature I had requested the designer of the TinySA add which I thought might be helpful in analyzing power line noise and other noise sources that are
Hi Bob, Im the person who determined that The third order IMD product of WWRU and WKDM could cause the spurious signal on 1940 KHz and then I provided my recommendation as follows. If the IMD is bein
Back in April 2022 there was a carrier on 40 meters for many weeks as I recall. TDOA was said to not work well because the carrier was constant whereas they said you needed the carrier to be on and o
Hi Don, Yes, I do use the technique you mentioned with my tuned loops but its amazing how much and quickly the angle changes (or possibly polarization). I often use that technique when listening to A
Hi Ken and Gang, I went back outside at 7:30am this morning with both my tuned loop and portable flag and both antennas indicate the same approximate heading I reported last night which is around 265
Peter and gang, I went out to an open field near my home to obtain more readings at 7am this morning (chilly 9 degrees F), and everything is still very consistent with my original readings from in fr