The Southern Ontario/WNY Radio-TV Forum / Study Shows The Worst Offenders For AM Interference

**Posted by RadioActive** February 4, 2025 10:11 am

This is a bit too technical for me, although I get most of what it says. It's a study done by researchers using three 50,000 watt radio stations in Baltimore to see what causes the most interference on AM in cars. Researchers chose a route that included both downtown traffic and places a bit farther away from built-up areas.

You can read what they found at the link below, but here's the stat that stood out to me:

"The study also observed that noise levels tend to decrease at higher frequencies in the AM band."

That doesn't completely surprise me, but all things being equal, it means not all 50K AM signals are created equal.

NRSC Releases Details of AM Band RF Noise Study

**Posted by mace** February 5, 2025 7:35 am

Agreed. WGR's 5000 watt daytime signal is much clearer in the GTA than WWKB's 50000 watt blowtorch. Years ago I read that the reason KB can't be received here very well at night is because we are getting a mixture of the groundwave and skywave signals. Not being a techie guy, I have no idea if there is any truth to this.

**Posted by RadioActive** February 5, 2025 7:47 am

KB's signal is also aimed the other way, making it very receivable into a good part of the U.S., but not the GTA.

CHML, may it rest in peace, did the same thing. I could get it better at night in New York City when I was there several years ago than overnight in Toronto.