almaniac27 said:Is the southeast null for WPHT/Philadelphia? WHKW's night signal in Kent usually gets blown out by WPHT's hash.
The nighttime protection of first adjacents from skywave is a relatively recent requirement. I think NARBA actually proposed originally that 1220 be used in the "Detroit, Michigan" area. Consider also all the first adacent skywaves from WSCR and WFAN, WJR and WABC, WABC and WBBM, WCBS and WLS, CKLW and WGY, WMVP and WINS, WINS and KDKA, KDKA and WBZ, WEPN and KYW, WTIC and WBAL, WBBR and WRVA, WWVA and WHAM, which affect millions of people, and now especially with digital sidebands on many of these. Some of these are more or less problematic, and I'm trying to predict which ones are from memory. I'm sure others can think of other examples, and perhaps some are not as big a problem as I might think. I know WJR and WABC were on the forefront of turning off digital sidebands at night, having had a heads up even during critical daytime hours before digital was allowed at night.
I think Carl Smith designed the WGAR 1220 array.