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October 12th 04, 03:29 AM
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"John Byrns" wrote in message ... In article , inch (Peter H.) wrote: The rf output of 1050 ESPN is directional, favoring the northeast. There is a null toward Philadephia to protect 1060 KYW. Actually, it is precisely the opposite. KYW was moved to Philadelphia from Chicago, probably as a 10 kW-U, ND station. 1060 in Philadelphia would be mutually exclusive with 1050 in New York if KYW didn't protect 1050, thereby establishing a defendable Class A contour towards the NE (and 1050) for itself. This all seems quite strange, so I assume there is a good story to explain how it all came about? Not knowing the dates when KYW moved to Philadelphia, or when the "NARBA" was ratified, I assume that the move of KYW occurred well before the "NARBA"? If this is the case, how did the KYW pattern come to have such a deep null towards WINS, which wouldn't have even existed at the time? As noted earlier, though, KYW has a minima, not a null. I suspect (although I make no claims to its accuracy) that the protection afforded the southwest (since it's done with two towers in Whitemarsh, PA, which is to the northeast of City Center) required that the maxima be directed towards Philadelphia and, serendipitously, in the other direction towards Reading, Harrisburg and Scranton. As a result of the minimum towards the southwest, and due to the two-tower design and the need to direct maximum towards Philadelphia, this resulted in a second minimum in the direction of New York. It was this protection which was already in place that allowed WHN to get their pattern and power. So KYW isn't really protecting 1050, and thus a 1-B is protecting a II...the antenna design simply fails to provide converage in that direction, but which still required that WHN (or ESPN 1050) protect KYW to the limits required in the rules. And WINS (that was a mistake, right?) has nothing to do with this....at 1010, it's far enough away from 1060 that neither station figures in the pattern of the other. Also of note is that WBZ has a directional pattern, but as a 1-A it protects nothing. It's done with a parasitic element suspended from the guy wires, which pulls in the power which would be wasted over the Atlantic. -- ----------------------------------------------------------------------------- If there's nothing that offends you in your community, then you know you're not living in a free society. Kim Campbell - ex-Prime Minister of Canada - 2004 ----------------------------------------------------------------------------- For direct replies, take out the contents between the hyphens. -Really!- |
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