Ken, The moral of my story was that with one ADSL modem I just needed filtering on the phone line right before it connected to my ADSL modem, but with a different model I had to add filtering to the
Treadmill combination filter update. Today I replaced the 10 amp commercial filter with the 20 amp version of the filter, and the results are similar. Below are a few measurements on 160 meters and 8
Hi Dave, The 20 amp version of the commercial filter was the model 20DRGG5 which is manufactured by Delta (I bought it from Digi-Key). This information along with information on the 14 turn toroid ch
Data from another treadmill RFI success story. A few days ago Lionel (N5LB) added filters to his treadmill based on what I had done to eliminate RFI from my wife's treadmill, and below are his very s
Hi Mike, I actually installed one 3 years ago and it is actually installed above ground on top of my chain link fence. I operate 160 meters and could hear it on 160 meters (and had the power level tu
Yesterday I decided to track down interference on 160 meters which I had suspected for some time to be from one of my neighbors treadmill or similar exercise equipment based on recent experiences fro
Hi Pete, There is some truth around car AM radios being a poor choice. I was experiencing S9 noise on 160 meters that turned out to be 1.07 miles away and my old 1976 Saturn Wagon AM radio could hear
Oops, my Saturn is 1996, not 1976. _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
Thought I would share my latest RFI issue that I tracked down yesterday to a local manufacturing facility located 0.5 miles from my QTH. Below is a link to a website that documents the interference,
Here is a somewhat long update on the RFI I tracked down to a local manufacturing facility a few weeks ago. Went to the facility a week ago with portable HF receiver and portable tuned shielded loop
Hi Ken, So far the only problems I have personally had with LED light bulbs is when a dimmer is used. The problem is most noticeable at the dimmest setting, and less severe when the lights are at ful
Hi Jamie, I know for sure that my 68 foot base loaded vertical re-radiates signals (such as local generated noise). When using my portable direction finding gear to track down local noise on 160 mete
Hi Jamie, I should mention that I am not sure I can call it re-radiation or just direct coupling of my direction finding loop to my 68 foot base loaded vertical, but the results are the same (points
Hi Jim (W9UUM) As Jim (K9YC) said, call the vendor and inquire about input line filters. If you hit a dead end you can check out my solution for treadmills that also have variable speed drives, and y
Hi Tony, I have a lot of experience with invisible fence transmitters, and I even reverse engineered (decoded the 8 bit code my transmitter sends) and then designed and built my own in case my purcha
Hi Ed, I think we need to be clear that even though those devices are exempt from specific emissions limits, per section 15.103 "The operator of the exempted device shall be required to stop operatin
Hi Kris, The chirp is kind of unusual, but I wonder if it's someone on a piece of exercise equipment? Kind of slow for a treadmill, but maybe not for a stair stepper or rowing machine, etc. When I se
Below is an E-mail I just sent Tony (N2TK), and thought the information should be shared with the entire group. -- Hi Tony, I talked with the Duane who is in the engineering group at Radio Systems Co
Here is the final update on my 160 meters interference that was originating from an injection molding machine located at a manufacturing facility 0.5 miles from my house. Last Friday a low cost 3 pha
Hi David, I have addressed treadmill interference before on here and I also created a simple website that documents the problem I had and the solution. I'm in China right now and have limited web acc