--- Begin Message ---
- Subject: Beverage versus DKAZ (was: TP for 20 October from Masset)
- From: Mark Connelly <markwa1ion@xxxxxxx>
- Date: Wed, 21 Oct 2015 12:04:16 -0400
- Delivered-to: irca@xxxxxxxxxxxxxxxx
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Could the anomalous results be from the fact that sometimes at the sunrise or sunset transition you actually have higher angle pick-up for long haul because of a tilted ionospheric layer above the receiving site (enabling chordal / ducted mode propagation reducing the number of ground reflections)?
http://www.radtelnetwork.com.au/propagation/HFpropagation_files/img013.gif
An antenna that is efficient for high angles may briefly outperform otherwise superior long haul DX (i.e. low angle pick-up) antennas.
There used to be a station near Madrid, Spain on 1359 kHz that ran big power into a Near Vertical Incidence Skywave antenna (horizontal dipole?) to push out high angle skip to penetrate isolated valley areas between mountains. Here in Massachusetts during mid-evening the station was no stronger than other high band Spain stations in the 5 to 10 kW class. But as dawn reached Madrid, the signal came up and got crazy-loud, often the strongest station from across the "pond" at the time.
160-m hams have reported that they have brief periods when a low dipole or horizontal loop below quarter-wave height ("cloud burner") contacts DX that their big verticals or high-altitude beams or dipoles miss. 95% of the time it's the other way around of course.
Mark Connelly, WA1ION
South Yarmouth, MA
<<
From: Walter Salmaniw <canswl@xxxxxxxxx>
700'
On Tuesday, 20 October 2015, Chuck Hutton
<charlesh3@xxxxxxx> wrote:
> Like Neil, I am curious about the length of the
BOG.And when you say you
> noted the same with the Wellbrook, do you mean it
lost out to a BOG or to a
> DKAZ?
> Chuck
>
> > Date: Wed, 21 Oct 2015
01:16:18 +0000
> > From: canswl@xxxxxxxxx <javascript:;>
> > To:
neilkaz@xxxxxxxxxxxxx <javascript:;>; irca@xxxxxxxxxxxxxxxx
> <javascript:;>
>
> Subject: Re: [IRCA] TP for 20 October from Masset
> >
> > Point is taken,
Neil. The Bog is about 300 deg while the DKAZ is aimed
> > about 220 deg. So
not exactly a perfect A B comparison. I noted the same
> > years back using
the twin Wellbrook arrays. Walt
> >
> > On Tuesday, 20 October 2015, neilkaz
<neilkaz@xxxxxxxxxxxxx
> <javascript:;>> wrote:
> >
> > > Walt " DKAZ worked
very well before LSR but really dies off after
> leaving
> > > the
> > >
Bog"
> > >
> > > A big difference would surprise me since DKAZ is also good
for low
> arrival
> > > angles. What exact direction is the BOG and how
long?
> > > What exact direction is the DKAZ?
> > >
> > > 73 and thx ..
KAZ
>>
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