Hi Pete, I use many different tools for identifying/tracking down interference, and Soundcard Scope is a tool I sometimes turn to early on to look at broadband interference I'm experiencing to see if
I agree with Dave, an audio dish would be the last thing I would buy (lowest priority item). A problem I found while working with the local power company that had an ultrasonic dish is that we could
Yesterday I tracked down RFI that has been bothering me on 160 meters for the past year. The source was a little hard to find because it's not always on. I finally had to use my SDR dongle with Ham i
Hi Paul, Triangulation already done (that's how I wound up at the property), and more importantly attenuation put in place to show the interference drops off to nothing when you leave the property. J
Quick follow up on my locating the source of the repeating 15 KHz signal (actually 15.6 KHz). Today I met with the suspect facilities machine controls engineer that just happens to be an inactive but
Hi Dave and gang, I totally agree on the smaller loop, but I believe what is also important is to factor in the implications of being in the near field. That's why I think going to a much higher freq
Hi Cortland, Thanks for the info. I just constructed a 3" diameter loop (not tuned) using some pretty rigid RG58U, and will try it along with a 6" diameter tuned loop (adjustable between 20 and 30 MH
Brief update,. Many thanks to all the suggestions from everyone, and a special thanks to Courtland and David Eckhardt for really pushing the usefulness of the small untuned loop when in the near fiel
Burndy makes compression terminals (lugs), and Brady makes wire marker labels. Just FYI, Don (wd8dsb) _______________________________________________ RFI mailing list RFI@contesting.com http://lists.
In all RFI cases that I have tracked down to VFDs (variable frequency / variable speed drives), the input line filter recommended by the drive manufacturer for EMC compliance had not been installed.
One idea would be to determine the width of the pulse using a software based audio scope to see how long it's on (and compare it with the audio pulse of WWV if that's what you think it might be. Uplo
Hi Bill, You show these repetitive signals on your SDR setup, but need to make sure they are real. 1) Do you actually hear each of these repetitive signals on your HF rig versus the SDR receiver? 2)
An easy alternative to a full blown spectrum analyzer is a chesp ($25) RTL-SDR dongle receiver plugged into a laptop with portable directional antenna. Full coverage from 25Mhz to 1.7 GHz. Easy to vi
A few years ago I tested both a Luton and Leviton LED dimmer with 120 VAC dimmble LED recessed lighting, and both generated RFI but in different portions of the MF and HF spectrum (very different beh
Since its been pretty slow on this list, thought I would share my most recent RFI problem that I've been working on (tracking down) which has included a few new twists. Noticed around the end of Janu
Hi Steve, Yes, I'm very suspicious of the AC power supply (also wonder if the battery is OK, but I would think the system would alarm if battery was sick), and can't wait to see what we find out. I'm
Hi Jim, Yep, I strongly suspect the power supply, but please note that from a liability standpoint it's very important that the owner of the equipment/property is the one to make the decision about t
Hi Frank and gang, I see lots of folks on the RFI reflector "wondering what an interference waveform might be from", and honestly after many years of tracking down RFI I have found that guessing what
Hi Michael, You mentioned three discharges per half cycle, but looks like it would be three discharges every other half cycle (if it is indeed power line equipment) since the period between the group