"David Eduardo" wrote in message
...

| "Michael Lawson" wrote in message
| news:16b7f$427a2948$d8c4c9e6 That big
| test is happening now in Cincy, where some of AA's
| content is on one of two clear channel stations
| in the area (WCKY). For comparision, Rush, Savage
| and the gang are not on the other clear channel station,
| WLW, but are on 550 WKRC, which has significantly
| less reach than WCKY.

| 550 has better daytime coverage and overall coverage of the local market
| than 1530. As a rule of thumb, 1 kw on 540 is equal to 50 kw on 1600 at the
| same location, so 550 and 1530 are going to get about equal local
| coverage... with 550 winning in some areas.

David - I take exception to this assertion. Sure, low-end ground wave is
better...MUCH better...than the high end, but it's more like a factor of 5,
maybe 10...not 50. In fact, referenencing the FCC graphs available as PDFs, the
560kHz graph shows that, for the 20mmhos conductivity curve, for example, the
curve intersects 10mV/m at 9.6km, whereas for the 1550kHz graph, this point is
at 7.6km....hardly even a factor of 2, and when squared (for coverage area) only
a factor of 1.5 or so. So, sure, a 1kW station may have decent coverage at
550kHz of perhaps 1000 sq.km, but a 50kW operation at 1600 kHz is still going to
have much, much more.
--
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Men born to freedom are naturally alert to repel invasion of their liberty by
evil-minded rulers. The greatest dangers to liberty lurk in insidious
encroachment by men of zeal, well-meaning but without understanding." -- Justice
Brandeis
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