[RFI] Power Line Ultrasound Detector

[doc]

What about using one of the parabolic mic gadgets that one
sees in the catalogs now and then.

Should only require limited mods.

doc

W0UN -- John Brosnahan wrote:
> I have been thinking about adding to my arsenal of power line RFI
> tools and the next one should probably be an ultrasonic detector with
> a parabolic dish.
> 
> Obviously, commercial ones are too expensive, AND I don't get to
> learn anything in the process, like I would if I build one.
> 
> Just wonder if anyone has any technical info on the commercial ones?
> Or any info on a write-up on a homebrew unit?  I have spent some
> time doing google searches to no avail, and I have not yet found a low
> cost clear-plastic parabola -- any suggestions.  I realize I don't need
> a clear-plastic dish for this -- just that it would make it look more like
> the professional ones.
> 
> Just seems like a fun little project.
> 
> Thanks for any tips.
> 
> 73  --John   W0UN


-- 
Thanks! & 73, doc kd4e

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