Sometime in December I noticed my noise floor on MF and HF increased and it was very noticeable on 40 meters (9 dB increase on 40 meters). My stationary pennant RX antennas (I have 3 of them) indicat
Hi Jim, Yes, always fun when I work you during a contest even though it was not on 160 meters this time around:) I actually always carry with me a power cord with a FT240-31 wound with 14 turns as we
Hi Randy, It is as far as Im concerned. A new groups.io was formed called EMI-RFI and Im not sure where thats headed but I certainly prefer the rfi@contesting forum based on what Ive been reading on
Mike (W9RE) was experiencing RFI on 160 meters that had repeating humps every 55 KHz and it turns out it was raising his overall noise floor. Yesterday Mike and I tracked the RFI down to his neighbor
I forgot to mention two things. 1) Once again a big thanks to K9YC for his original work using the FT-240-31 material for common mode chokes. We used a common mode choke based on the FT-240-31 materi
Hi Jeff, I know you said the neighbor is not interested in doing a circuit breaker test but I assume you mean turning off one circuit breaker at a time until the RFI goes away. I now try and avoid tu
Hi Jeff, 1) I vaguely see what appears to be an approximate 19 KHz repeating signal which may or may not be related to the issue at hand. 2) Can you please tell us how it was determined that the hous
Hi Jeff, What was the bandwidth setting for the audio clip? Looking at the audio it has heavy 60 Hz content (not 120 Hz). It has an overall repeating pattern at a frequency of 60 Hz. When dealing wit
Hi Jeff, The "banding" in your wide spectrum plot is interesting and it would be curious to see what it looks like at the various levels that you have reported. This info would probably be very helpf
Hi Mike, I too did FFT using both my oscilloscope and a software based audio oscilloscope and will post them on a website and share it with the group in just a little bit. I also did it on a known po
Hi Everyone, I just created a simple website to share pictures and some text for the analysis (including FFT) that I did on the unknown RFI Jeff (W4DD) is trying to identify and I included known powe
As I mentioned in a recent post I have had much better success observing the AM audio spectrum for power line RFI and other broadband noise when using a bandwidth much wider than conventional receive
Mike (K8CN) commented and asked me some great questions offline and thought I should make a comment to the group as I'm sure others have similar questions or comments. The issue is in regards to band