Re: [IRCA] KGA/KPIG

["chris and anne" <tantwo@xxxxxxxxxxxxx>]

Dan, I always look forward to your take on things. I learn a lot from them. 
Thanks, Chris Johnson , K4NHL  S.C.
----- Original Message ----- 
From: "Dan Strassberg" <dan.strassberg@xxxxxxx>
To: <irca@xxxxxxxxxxxxxxxx>
Cc: "PeterH5322" <peterh5322@xxxxxxxxxxxxxxx>; "Scott Fybush" 
<scott@xxxxxxxxxx>
Sent: Friday, July 27, 2007 3:43 PM
Subject: [IRCA] KGA/KPIG


> Everyone seems to assume that KGA will downgrade to a Class B to allow an
> upgrade of KPIG. Although that is probably what will happen, there are
> plausible scenarios under which KPIG could upgrade its night signal while
> KGA remains a Class A. With the five towers at the KGA/KJRB site, KGA has
> many options for modifying its night pattern to reduce radiation toward
> KPIG. That reduction alone, with no change in KPIG's night pattern or 
> power,
> would improve KPIG's night coverage because KPIG's NIF contour is probably
> entirely determined by the 10% skywave that KGA delivers to the north Bay
> area. Remember KGA sends more than 2600 mV/m @ 1km toward KPIG. Using the
> existing towers, designing an array that sends only 10% of that toward 
> KPIG
> would most likely allow KPIG to extend its NIF coverage to 10% of the
> existing NIF field intensity. And KGA could probably reduce its signal
> toward KPIG by a factor of more than 10 without great difficulty.
>
> No doubt, though, KPIG wants more--that is, a substantial increase in 
> night
> power, which would allow further extension of its night coverage. As you
> probably know, KPIG has a most unusual antenna system. I believe it to be
> the US's only rooftop DA. In addition, one element of the five-element 
> array
> is a drop-wire suspended from a cable attached to the tops of two of the
> four "real" towers. I have no clue as to how much tighter KPIG's night
> pattern could be made, but for KGA to remain a Class A, KPIG would have to
> continue limiting its night signal toward KGA. If KGA pulled in its night
> pattern, the limitation on KPIG's nighttime signal to the north would be
> relaxed because KGA's protected contour would lie much further north than 
> it
> does at present. In other words, the distance from KPIG to KGA's protected
> contour might easily increase by a factor of three or four. That could 
> allow
> a substantial increase in KPIG's night power without modification of 
> KPIG's
> night pattern. If the minimum to the north could be made deeper, KPIG 
> could
> increase its power further. My guess is that with the appropriate mods at
> KGA, KPIG might be able to increase its night power by a factor of 10 or
> more without forcing KGA to give up its Class A status. It's not
> inconceivable that KPIG could run as much as 5 kW at night without KGA
> having to drop to a lower class.
>
> --
> Dan Strassberg, dan.strassberg@xxxxxxx
> eFax 707-215-6367
>
>
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