[BC] Class A Miscues - Was: KDKA

[Mike McCarthy]

 From soneone who lives in between the sites...  WLS has lost some coverage 
due presumably to the urbanization of the area around the tower.  While 
WGN, WBBM and WSCR (ex WMAQ)  are also in similar spots, they are closer to 
the center of the metro.  What I can't figure out is why WLS is lower at 
the middle point between WGN/WBBM and WLS's sites.  The amount of 
urbanization  between them is just about complete. Also when out west by 
50-60 miles, WGN's signal is far better than WLS's at equal 
distances.  WBBM's a down greatly...but for reasons which we do know and 
are not conductivity related.

MM

At 08:01 PM 5/14/2005 -0400, you wrote:

> >Poor Conductivity in this part of the world? Tell me about it.  We
> >measured .5 over some paths getting our 630 into St. Marys WV--just about
> >100 miles SW of Pittsburgh.
>
>WLS wisely (perhaps over a half-century ago) sited its Tx in an area of
>relatively higher conductivity which, according to M3, extends from the
>SW Chicago suburbs all the way through Illinois to St. Louis, Missouri.
>Well, perhaps East St. Louis, Illinois.
>
>The other Chicago Class I-As sited themselves west of the city, and
>closer to its center, but in an area of realtively lower ground
>conductivity.
>
>Now, WSL has palpably excellent suburban and rural primary service (it
>always had excellent secondary service to the West Coast, IMO), whereas
>the other Chicago Class I-As have better urban primary service, but
>palpably poorer suburban and rural primary service (these had poor
>secondary service to the West Coast, IMO).
>
>Combining sites is economically interesting, but a possible disaster,
>should, say, a higher frequency Class A diplex with a co-owned lower
>frequency Class A, as "ratcheting" could very well apply.
>
>In one case I am familiar with, this ratcheting could result in the
>higher-frequency Class A having to reduce power to, say, around 35 kW, if
>such diplexing were to be implemented.
>
>
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