....... Another array that we
experimented with was the Double loop Wellbrook, which also was no slouch
of a performer, especially when we changed the loops from delta loops to
rectangular loops (remember, Nick?).....Walt
On Tue, Oct 23, 2018 at 4:37 PM Guy Atkins <dx@xxxxxxxxxxxxx> wrote:
> Hi Nick,
>
> The best F/B of any phased antenna I've experienced at the coast was Dallas
> Lankford's Quad Delta Flag Array (QDFA). I know you're quite familiar with
> this, but some others on the IRCA list may not be. Here is an archived link
> to Dallas' article on this antenna:
>
>
>
http://web.archive.org/web/20100921085637fw_/http://kongsfjord.no/dl/Antennas/Phased%20Delta%20Flag%20Arrays%20rev%2010.pdf
>
> I worked with Dallas in 2009 to get his design tested and operational at
> Grayland. Once we got a few bugs out of this complicated design, the result
> was phenomenal. Check out the pattern on page 3 of the PDF and you'll see
> why domestic inland DX at sunrise was knocked down to a degree I'd never
> experienced before or since.
>
> This four loop, phased antenna system is NOT DXpedition friendly. Because
> of the complexity it's best for a permanent installation. I know that
> Bjarne Mjelde also installed a QDFA some years ago but I don't know if it's
> still operational.
>
> 73,
>
> Guy Atkins
> Puyallup, WA
>
> On Tue, Oct 23, 2018 at 8:42 AM Nick Hall-Patch <nhp@xxxxxxxx> wrote:
>
> > For the coastal DXer, I think that the takeaway
> > from the presentation was that the really
> > important thing is not so much the response from
> > the two quadrants facing out over the ocean, but
> > rather, the two quadrants facing the domestic interference.
> >
> > The DKaz has a narrower beam, but often the MW
> > DXer wants to hear whatever the conditions
> > deliver, whether it be New Zealand or Siberia, so
> > a narrow beam is not always an advantage. But
> > ideally, don't you really want zero signal from
> > the two quadrants facing inland? The DX is out
> > there, but in a realistic situation, often it is
> > hard to (impossible?) to read due to domestic splatter.
> >
> > Where the DKaz really shines then is in those two
> > quadrants facing inland. It delivers less signal
> > from those two quadrants than the Flag does, so the DX is more readable.
> >
> > For an inland DXer, the narrower beam will be
> > more an advantage, because it will lessen
> > interference in the forward direction, but
> > probably it is still better to place its back
> > side to minimize the overall interference level,
> > because the beam width is still wide enough to
> > inhale a fair bit of DX, . Craig's 260 degree
> > proposed direction should be ideal for down
> > under, and still hear Japan pretty well with that
> > 100 degree beam width. Hopefully, it
> > incidentally nulls a lot of domestic interference as well.
> >
> >
> > Nick
> >
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