[aprssig] Helmet Antenna - dont bother.

Jim Duncan jdbandman at earthlink.net
Sun Mar 6 18:35:37 CST 2005

So, does that mean you're confessing to the presence of a metal plate in 
your head, Bob????


73 de Jim, KU0G

Robert Bruninga wrote:

> Today I was tail-bike on a marathon.  
> Lesson:  Dont bother with a helmet antenna
> for voice.  (APRS maybe, but not for just voice).
> I took one of those tiny 19" mag mount
> whips with a small base (like a kisses chocolate piece)
> stuck it inside the helmet protruding up through the 
> air holes, covered the inside with aluminum foil and
> then let a can lid stick to the bottom of the magnet.
> I also, carried an identical HT with its own
> long whip.  Conclusion was generally no difference
> after lots of side-by-side tests...
> Therefore, dont bother.
> An HT held to my mouth with a similar 19" whip is 
> going to work similarly as a 19" whip on the helmet at 
> the same height.  I had just hoped that the slightly
> better ground  plane might work better than the HT with 
> no real  counterpoise.... dont bother.
> Now, for APRS where you are not holding the HT to
> your mouth, then maybe the extra height and lack
> of body blockage is worth it.
> Just 2 cents...
> Bob
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73 de Jim, KU0G

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