Re: [IRCA] KAZ versus Pennant/Flag

[Guy Atkins <dx@xxxxxxxxxxxxx>]

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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