[TowerTalk] Noisy TH7

[DavidC]

Dear John:

   You post is most appropriate.  Welcome to the fray!  Seriously,
you will discover some of the most helpful and encouraging folks
in all of Amateur Radio right here on TowerTalk.

   If you search the TowerTalk archives I know that this topic has
been discussed in the past, though often folks forget to change the
Subject and thus it may be hidden under another Subject heading.

   I remember as a child we had such a whistle from a roof rack,
a clever mechanic solved it with a piece of tape -- he merely
broke up the resonance.  I presume that your solution is the same.

   Do you have a way to measure the wind speed up there?  If
the beam only "sings" at a certain wind speed you may be able
to quiet "her arias" down with a clamp, a piece of tape or even a
spot of glue here and there.

   I look forward to other suggestions from those who have fixed
this problem on their beams.

- Thanks! & 73, DavidC  K1YP in Hudson, FL

************************************************************************

> This is my first posting to Tower Talk, and I hope my question isn't too
> 'newbie'.
>
> I have a TH7 on a 60ft tower. As an antenna it works extremely well, but
it
> has one drawback -- it 'whistles' badly in almost anything over a few
knots
> of wind. This is especially upsetting for Madam, who likes to sit in the
> garden but finds the howling from the antenna intolerable. I can't say I
> particularly care for it myself. It's not even clear to me which part of
> the antenna is making the noise, although I presume it's most likely to be
> air blowing across the trap drainage holes and exciting some sort of
> resonance.
>
> Whatever it might be, can anyone please suggest a fix? Or is wind noise a
> generic problem with HF Yagi antennas?
>
> 73 John
> GW4FRX


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