[RFI] Does a power pole generating RFI always generate ultrasonics?

[Rick Karlquist]

Remember that sound, unlike RF, doesn't go through wood.
You need to have line of sight to the ultrasonic noise.

I also have a popping noise on a nearby pole, for whatever
that is worth.

Rick N6RK


Stu Phillips wrote:
>
>
> I'm tracking a power pole near my QTH that is generating RFI from 15m on
> up.  With a combination of HF and VHF antenna, I'm pretty sure I've
> tracked to the correct pole.  This pole is generating more of a
> "cracking/poping" form of RFI rather than a constant arc like RFI.
>
>
>
> I recently built an Ultrasonic detector as an additional tool in my bag
> - it seems to work as I can hear tire noise, rubbing fingers, rat
> repeller etc...  BUT...
>
>
>
> When I check out this pole, I can't hear anything ultrasonic wise.
>
>
>
> So my question...
>
>
>
> Does a power pole generating RFI ALWAYS generate ultrasonics that are
> strong enough to be heard from the ground?
>
>
>
> Thanks!
>
> Stu K6TU
>
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