Hunting Down Power Line Noise and Other RFI
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- Опубліковано 15 лют 2023
- Good radio reception is all about maintaining the highest possible signal to noise ratio at the receiver, but the electrical grid can be a potent generator of radio frequency interference throughout the amateur radio bands. Add to that, the widespread application of switching power supplies in products ranging from cell phone chargers to washing machines to HVAC equipment only adds to the sea of RFI that Hams have to deal with.
Jeff Stuparits, W4DD, has years of experience hunting down RFI. During this time he has developed a suite of tools and techniques for hunting down radio interference, and has learned that developing a good working relationship with the power company and the neighbors is critical to resolving RFI problems. Jeff tells all in this presentation from the Antique Wireless Association's "AWA Shares" program.
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Excellent presentation, I have learned a lot. Thank you so much. 73👍📶
Thank you for this excellent and most professional presentation. I plan to follow the recommendations in this presentation. 73 N4HAY
Thank You Jeff, great presentation. Very generous of you to make your RF mapping tool available, we use commercially made GPS/receivers for coverage testing of digital RF systems, which are impractical because of their cost. Your home brewing approach is commendable. Sounds like the power company hired you for solving some of their own problems. 73
Excellent presentation. Thank you so much for putting this together.
Many thanks for your excellent presentation. I am about to embark in locating a very nasty RFI source. Your presentation has been very useful. One question: what about using a small amplified loop in the 80m or 40m band rather than the yagi at 136 MHz?
Great video, really incredible solution and so useful. Is the software or something like it available anywhere?
I suspect the main problem with switchers is that the designers are under severe cost constraints (e.g. I've purchased CFLs for under a dollar), and as a result they can't afford to have much if any concern about RFI. Until regulatory institutions become involved there's nothing to drive improvement in the basic technology, which is what's really needed. Tesla doesn't offer the AM band on their car radios for this reason, so one can infer that EVs will become a major source of switcher hash as they become more common, which is understandable due to the very high switching currents. I noticed TI tried to specifically address this AM band hash, but was disappointed to see their solution was to simply move the switcher's fundamental up to 2 MHz, and so the interference levels will be even worse in the HF region.
Since the RFI is caused by arcing through the insulator/arrestor I wonder if a sensitive IR camera could spot a bad insulator/arrestor.
Neighbor had a thermostat heating knocking out our TV on ant. Yrs ago .
Great presentation. Sorry, I do not see reference to solder ground on metal Amphenol ethernet connectors on the Mouser site. Can you provide a link please? Thank you!
Where did you obtain the dish from? Can Dish Network Satellite dishes be retrofitted to make this ultrasonic reflector? What is the part number of the sensor? And is the electronics pack an audio amplifier or is there a mixer to bring the ultrasonic frequencies down into the audio spectrum for listening purposes?
where can one obtain the software?
I've replaced the some power supplies with unregulated since the router can accept a range of voltages. Do you use shielded ethernet cable around the house?