Re: [IRCA] Antenna pattern testing of a MW tuned loop

[Nick Hall-Patch <nhp@xxxxxxxx>]

Thanks for passing on your findings Brian.

Actually, the skewing isn't as bad as I might have expected for such 
a large loop.   The larger the loop, the more likely there will be 
slight anomalies in the construction, I would expect, which would 
have your loop acting a bit like a random wire.   The slight tilt is 
also going to introduce some discrepancy, and nearby house wiring 
isn't going to help.  So I think you're doing pretty well.   (I 
believe I've gotten deeper and better aligned nulls with smaller 
loops in the past...tested outside)

For DXing, one often would like the "best null", which doesn't always 
occur on the same antenna as what one might use for direction finding.

best wishes,

Nick


At 03:27 29-04-15, you wrote:
> In preparation for some testing I want to do with a Superloop antenna once
> I can figure out a reasonable way to rotate it, I did some pattern testing
> yesterday on my 6-foot tuned loop.  I used my SDR and a simple hiking
> compass to take signal strength readings on 4 local and local-ish stations
> in 10 degree increments, plus extra measurements near the two nulls in the
> pattern.  I was pretty happy with the results, but there were a few
> oddities (the two nulls for each station were considerably different, the
> directional patterns were significantly skewed for my hyper-locals, and a
> few other things).  A full writeup is too long for the list and wouldn't be
> complete without the plots, but I've put up a detailed blog post, including
> the pattern plots:
> https://azswdxing.wordpress.com/2015/04/27/gear-pattern-test-of-am-bcb-tuned-loop-antenna/
>
> I haven't seen a lot of full pattern testing data on-line, but it's
> obviously much more difficult to do for larger antennas.  Comments welcomed
> and encouraged.
>
> Brian Rachford - Prescott, AZ
> azswdxing@xxxxxxxxx
> http://azswdxing.wordpress.com/
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