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Re: [IRCA] Cape Lookout Oregon non-DX Overview - Oct. 31-Nov. 2



Hi Guy,

I've done similar work here with more closely spaced ALA100s and the Wellbrook phasing unit. Same results, good, sometimes spectacular nulls, and a marked decline in signal strength from the desired direction as well. Usually defeats the purpose when you are looking for overseas weak signals in the boresight.

Chuck Hutton pointed out to me that the effect can be modeled, and Chavdar Levkov also has modeled / experimented with phasing closely spaced antennas:

http://www.lz1aq.signacor.com/docs/phased-array/2-ele_phased_array11.pdf

http://active-antenna.eu/tech-docs/radiation_patterns.pdf


best wishes,

Nick




At 06:32 12-11-16, Guy Atkins wrote:
Hi Nick,

The conclusions were inconclusive, LOL!

The bulk of the so-called experiments involved observing phasing results
with close spacing (approx. 70 feet between antennas). Andrew Ikin of
Wellbrook has said repeatedly to me and Dave that his phaser design
requires a minimum of 40 meters spacing to work effectively. However, Dave
had the Quantum Phaser along, and he knew we could get *some* results at
closer spacing but with a limited bandwidth. We did not have a Wellbrook
phasing unit with us this trip.

Dave found that he could indeed get decent nulls (loop vs loop, or loop vs
vertical) at 70 feet, but unfortunately the desired DX signal strength
dropped along with the nulled station! That's the main takeaway that I
remember from our work, which granted wasn't very scientific. Too bad you
weren't along, Nick, as I know you'd keep us in line and help us reduce
variables and banish wishful thinking :^)

73,

Guy



---------- Forwarded message ----------
> From: Nicholas Hall-Patch <nhp@xxxxxxxx>
> To: Mailing list for the International Radio Club of America <
> irca@xxxxxxxxxxxxxxxx>
> Cc:
> Date: Wed, 9 Nov 2016 12:44:49 +0000
> Subject: Re: [IRCA] Cape Lookout Oregon non-DX Overview - Oct. 31-Nov. 2
> And what did you conclude from the experiments, Guy?    I always find that
> my experiments raise more questions than they answer, especially if they
> involve phasing.
>
> best wishes,
>
> Nick
>
>
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Nick Hall-Patch
Victoria, BC
Canada
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