Just curious if any of you know what station(s) 1220 WHKW (former WGAR) is protecting out to the south and west of Cleveland?
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1220 in Cleveland, OH
- Thread starter Nightpattern
- Start date
celar said:
Uh, no. My guess would an adjacent protection for the former WCOL Columbus and WCWA Toledo at 1230.
Nightpattern said:
At night, XEB Mexico City. That's the Class A station on the channel. The stations celar posted are all Class D and are not entitled to any interference protection at night.
I'm not sure why they're directional during the day. My best guess is that radiorob2.0 is right: that the Class C stations in Columbus and Toledo came first and are entitled to protection. ISTR WGAR was on 1480 until shortly after WW2.
w9wi said:
It may not have anything to do with protection. Rather, it might have something to do with the old rule requiring AM stations to put 25 mV/m over the main post office of their city of license. The 1220 site on Broadview Road is a good long way south of downtown Cleveland, and the DA may have been designed to concentrate as much signal as possible over the COL.
w9wi said:
I was thinking it was because of the 1230's in Columbus and Toledo but I had never heard of a Class B protecting a Class C.
w9wi said:
The reason that WHK is DA-1 is the US/Mexico treaty, originally signed in, I believe, 1940 or '41, which governs the use of two Mexican IA channels (now Class A) by full-time stations in the US. The two channels are 1050 and 1220 and the US stations involved are in New York City and Cleveland OH. In both cases, the treaty specifies (according to a guy who claims to have read it) that the stations shall operate with 50 kW-U DA-1 using patterns that protect the US-Mexican border. Now, aside from the treaty, the reason for WEPN running DA-1 is pretty obvious--first-adjacent KYW, which also runs 50 kW-U DA-! and is less than 90 miles southwest of WEPN. KYW protects both WEPN and the Mexican border. As for WHK, at the time it was built (as WGAR), the only reason for its daytime use of a pattern with a broad, deep minimum to the southwest was most probably the treaty.
Nightpattern said:
The Class C's in question predate the WGAR upgrade.
w9wi said:
What were then 250W Class IV stations over 100 miles from Cleveland in the days when first-adjacent protections were 0.5 mV/m to 0.5 mV/m (they are tighter now: 0.25 to 0.5 and 0.5 to 0.25) would surely have prevented WGAR from running ND days--especially given the good soil conductivity in the midwest--but would not have required anything like the pattern's deep minimum to the southwest. The treaty has to have been responsible for the extreme degree of daytime protection. Most likely the drafters of the treaty were thinking about the impact in Mexico of daytime skywave from the 50-kW Cleveland station. Daytime skywave was a known phenomenon back then but such devices as critical hours and the associated formulas for reducing radiation toward Class I stations during CH had not yet been devised. The approach in those years was either to completely ignore daytime skywave or limit radiation toward protected stations during all daylight hours.
R. Fry said:
Don't think so, although the WGAR pattern, which minimized (but did not eliminate) overlap with WJR, might have allowed Richards to buy WGAR if he didn't already own it before it upgraded. WGAR's competitor for the 1220 50-kW DA-1 facilities in northeast Ohio was WADC Akron, which proposed a more conventional six-tower array that also would have limited coverage in pretty much the same way as does WGAR's five-tower array.
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