Re: [IRCA] 1120 Yelm Wa.

[Scott Fybush <scott@xxxxxxxxxx>]

bill kral wrote:
> Northwest Broadcasters reports that a new CP has been granted for a
> station to operate on 1120 ,10 KW/6 KW in Yelm, Wa. south of Tacoma.
> When they start that one up how are they going to keep the big KPNW
> in Eugene OR. out of their area at night? Bill in BC

They're not, and they'll have a lousy night signal as a result. 
According to the Yelm CP application, there's enough KPNW signal coming 
north to create a 31.1 mV/m interference-free contour for Yelm at night.

In other words, you'd have to be close enough to Yelm to get a 31.1 mV/m 
 signal to overcome all the interference from KPNW. That's a VERY, VERY 
strong signal - by contrast, the sort of signal we'd think of as 
"armchair DX" is usually somewhere in the 1 mV/m range.

So in practice, you'd almost have to be looking at the Yelm towers in 
order to get a clean night signal from them. And indeed, as the maps 
attached to the application show, they won't even put that much signal 
over all of the tiny little community of Yelm.

But the FCC rules say that they only have to cover 80% of Yelm with a 
nighttime interference-free signal, which they'll just barely do - and 
that they can't cause interference to KPNW's groundwave at night, which 
they won't.

Because KPNW is a class B facility, not class A, it has no protection to 
its nighttime skywave...so if you're a KPNW listener in Yelm, you're out 
of luck.

By the time you get to Olympia or Tacoma at night, the Yelm 1120 will be 
completely buried under KPNW.

s
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