swfl said:
I was reading on the Cleveland board that KFGO is even creating havoc in the Cleveland area. While I fully understand why KFGO is operating at full power nighttime right now this situation points out the problem of having two 50,000 watt stations on the same frequency even with one of them powering down at night. The FCC has made a mess of the AM band by allowing so many stations on the same frequencies in my opinion.
KFGO is on 790. The station that's causing interference to WTAM is WZFG, 1100 in Dilworth MN (just east of Fargo, across the river.)
A little bit of AM history here: there is a long history, going back all the way to the 1920s (and predating the FCC itself!), of stations being allocated daytime facilities that would cause intolerable interference if operated at night. It makes perfect allocations sense - WTAM's signal simply does not exist in North Dakota and Minnesota by day, so why not allow another broadcaster to provide useful service to the population up there on a frequency that's otherwise wide open?
Back in the day, a station like WZFG would have been licensed as a strict daytimer, with no night operation allowed.
But here's the thing:
even back in the 1920s or 1930s, a station like WZFG, had it existed, would have been permitted (encouraged, even) to stay on the air with its day facilities after dark if public safety was at stake.
The additional interference generated is a small, and temporary, price to pay for the provision of important public service to a region that's still in the grips of a devastating weather emergency.
Now here's the other interesting aspect of this: what's happening between WZFG and WTAM should be a lesson to anyone still chasing the chimera of a workable nighttime AM IBOC system.
(You listening over there on the HD Radio board?)
There's no value to WZFG's programming being available to listeners in Ohio, where it's interfering with WTAM -
but there's also no way to stop it, because the laws of physics dictate that medium-wave signals carry by skywave at night. And just as WZFG creates unintentional interference to WTAM within its primary listening area, the adjacent-channel digital carriers of WTAM create noise within the primary listening area of other stations on 1090 and 1110. It may not be as easily identifiable as WZFG's noise against WTAM, but it's there.
The only difference is that WZFG's interference to WTAM is only temporary, and in the service of a greater good. The IBOC interference...maybe not so much.