Typist Clerk
Well-Known Member
- Joined
- Jan 30, 2021
- Messages
- 390
The Rocky Mountains do a pretty good job of blocking most clear channels from the East Coast, which has stirred up arguments for and against multiple Clash I-A stations on the same frequency across time zones. The other thing that hinders picking up far signals is bleed over from closer, less powerful stations one or two clicks up or down the dial.
I can't hear WJR 760 out of Detroit here in north Georgia because WSB 750's signal overwhelms it. However, I have been in the rental car on my way to the Detroit airport before dawn and heard WSB. So there's something about WJR's night-time pattern that's different.
I only worked at one 50,000 watt blowtorch: KFBK in Sacramento. I was responsible for switching the pattern at dusk to protect several smaller stations on the same frequency. I remember getting my butt chewed by the chief engineer for not remembering to make the switch one night, and he had apparently gotten a call from Colorado Springs where we were bleeding over someone else's 1530.
Daytimers are an even weirder deal. You get more airtime in the summer -- signoff is usually determined by the monthly average sunset -- but there's hell to pay if you decide to play an extra record or two past the scheduled transmitter shutoff time.
The four clear-channel stations in Chicago (670, 720, 780, 890) do hit both coasts, but their effectiveness on the West Coast is negated by the presence of other stations in the area. The signal is there, just covered. If the closer station goes silent, there's a good chance you can hear the audio.
720 is an interesting example. WGN's 50 kW signal can be heard in Hawaii on a souped-up antenna now that KDWN Las Vegas, once a 50 kW directional, then 10 kW directional (west to protect WGN's nighttime service area) is gone. But in the west, another 720, KFIR Sweet Home, Ore., has now chosen to stay on its daytime power of 10 kW rather than drop to its required 146 watts at night. That makes WGN that much harder to hear in the Pacific Northwest. (KFIR is an easy catch in Boise, Idaho, tonight, and should not be.)
Re 750: The ground conductivity in much of Georgia is much poorer than it is in the Midwest. Driving through Georgia in the day, WSB 750 just about disappears by Macon, if I recall. Yet you can hear Chicago's four clears into Ohio (670 all the way to the outskirts of Columbus). And WSB bombs into the Midwest at night because the ground helps the signal, whereas in Georgia WJR and other clears are attenuated by the ground. Then again, I spent a night in Aiken, S.C., last spring and had no trouble picking up the usual suspects to the north, all the way to Toronto's CFZM 740, and one morning several years ago, drove into Augusta, Ga., a few miles south of Aiken, and had no trouble hearing both WLS 890 and WYLL 1160 (a directional East 50 kW in Chicago) rolling into the Augusta National parking lot.