My read isn't that this is a daytime skywave issue but rather a sunrise/sunset issue, although the same solution might still help.
Russ Edmunds Blue Bell, PA ( 360' ASL ) [15 mi NNW of Philadelphia] 40:08:45N; 75:16:04W, Grid FN20id <wb2...@yahoo.com> FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15' AM: Modified Sony ICF 2010 barefoot --- On Thu, 10/7/10, Scott Fybush <sc...@fybush.com> wrote: > From: Scott Fybush <sc...@fybush.com> > Subject: Re: [IRCA] Re; 1130 Interference > To: "Mailing list for the International Radio Club of America" > <irca@hard-core-dx.com> > Date: Thursday, October 7, 2010, 2:30 PM > Patrick Martin wrote: > > There is gotta be something CKWX can do, as their > listeners in the > > Frasier Valley are putting with the interference. > > I'm sure CKWX wishes it were so - but there really may not > be much they can do, at least in the short term. The FM dial > in the Puget Sound region is so overcrowded that I can't > imagine a frequency being available for them to add an FM > signal serving the Fraser Valley. > > As a Canadian company, Rogers can't even legally buy KPWX > to shut it down. > > Perhaps the best precedent I can think of also came from > Rogers, a long time ago. CFTR 680 was a 25 kW signal from a > 13-tower array in Mississauga, west of Toronto, and its > signal in parts of the Toronto area was hurt by the nulls it > had to provide to WNYR 680, a non-DA 250-watt daytimer in > Rochester, about 90 miles across the lake to the southeast. > Rochester had been there first - it signed on in 1947, while > Toronto only arrived on 680 in the 1960s, when Rogers moved > what was then CHFI from 1540 to 680 and CHLO in St. Thomas, > Ontario from 680 to 1570. > > It took several years of high-level international > negotiations (the State Department and its Canadian > counterpart were involved), but Rogers brokered a deal that > allowed WNYR in Rochester to move to 990, which was a > Canadian clear channel. Canada agreed to waive its treaty > protections to let Rochester use the channel, and Rogers > paid for a new and very expensive six-tower directional > array for 990 in Rochester. Getting WNYR off 680 allowed > CFTR to move to a much better site due south of Toronto in > Grimsby, Ontario, where it increased power to 50 kW, all > blasted due north into Toronto. > > I *think* (though I haven't done the math on it) that part > of the problem CKWX is experiencing from KPWX is the result > of KPWX using VERY short towers, which result in a skywave > takeoff angle that creates close-in skywave right over > Vancouver. Since the treaties don't address daytime skywave, > there's no penalty to KPWX for doing this, and KPWX benefits > by saving money on tower construction. (Their towers are > really, REALLY short - 53 electrical degrees in height, > compared to 90 degrees for a more typical class B station > and 190 degrees for a typical class A.) > > If KPWX could get zoning permission to build taller towers > (and that's far from guaranteed these days!), I suspect much > of the critical-hours skywave issue could be > ameliorated...and paying for taller towers would probably > end up being a lot cheaper for CKWX than the legal hassles > they'd get into if they try to fight what's probably an > otherwise unwinnable fight. > > (I am not a lawyer or an engineering consultant, etc...) > > s > _______________________________________________ > IRCA mailing list > IRCA@hard-core-dx.com > http://montreal.kotalampi.com/mailman/listinfo/irca > > Opinions expressed in messages on this mailing list are > those of the original contributors and do not necessarily > reflect the opinion of the IRCA, its editors, publishing > staff, or officers > > For more information: http://www.ircaonline.org > > To Post a message: irca@hard-core-dx.com > > _______________________________________________ IRCA mailing list IRCA@hard-core-dx.com http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: irca@hard-core-dx.com
