Re: [IRCA] KGA 1510 app

[Scott Fybush <scott@xxxxxxxxxx>]

Patrick Martin wrote:
> Mike,
> 
> As it has been said before "money talks". It will be interesting to find
> out what the pattern will be with the new 15 KW. 

Find out? No need to guess. It's all right there in the application, as 
is KPIG's application for 2400 watts (not 4 kW, as was stated earlier in 
the thread) at night.

There are no surprises in either - KGA's new pattern, using four of the 
towers at the site it shares with KJRB 790 south of Spokane, will be one 
big fan-shaped lobe aimed WNW, with a very small back lobe aimed SE. The 
application lays out precisely what the new signal will do and what it 
will cover: the 5 mV/m nighttime groundwave contour will just clip the 
northern Spokane city limits, while the 2 mV/m "protected" nighttime 
contour (I'm not sure I agree with the stated rationale behind that 
figure) will cover about 400,000 people, taking in all but the northern 
panhandle of Spokane County. Coeur d'Alene loses predicted night 
coverage, though it should do OK...for now.

The big "what if" here is what the other western 1510s will end up doing 
when KGA makes its move. In its application, KGA identifies the class D 
stations in Mesa/Phoenix, Fresno, Milbank SD and West Jordan/Salt Lake 
as being potentially eligible to become class B operations once they 
don't need to protect KGA. It also notes that the existing class B 
operations at KSPA 1510 Ontario CA and at KGDD 1520 Oregon City/Portland 
will enjoy significantly lower NIFs as a result of the KGA downgrade. 
(That likely means, though KGA doesn't say so, that those stations might 
be able to improve their own night signals.)

And of course the point of all of this is the upgrade to KPIG. Just by 
knocking KGA down, KPIG's NIF drops dramatically, from 16.6 to 4.0. That 
alone would give KPIG usable night service over much of San Francisco - 
but the power increase from 220 to 2400 watts will improve that even 
more, picking up most of San Mateo County, Marin County and at least the 
coastal portions of the East Bay. It will still be an unusable signal in 
the South Bay (thanks to KSJX on 1500), the North Bay (thanks in part to 
KTOB on 1490) and over the East Bay hills in Contra Costa County.

It's all in black and white (and some color, actually) right here:

http://fjallfoss.fcc.gov/prod/cdbs/forms/prod/getattachment_exh.cgi?exhibit_id=524863

(watch the wrap!)

s
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