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[aprssig] Helmet Antenna - dont bother.

Cap Pennell cap at cruzio.com
Mon Mar 7 01:26:11 UTC 2005


We want a picture!
73, Cap

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org
> [mailto:aprssig-bounces at lists.tapr.org]On Behalf Of Robert Bruninga
> Sent: Sunday, March 06, 2005 16:25 PM
> To: aprssig at lists.tapr.org
> Subject: [aprssig] Helmet Antenna - dont bother.
> 
> 
> 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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