[TowerTalk] Lossy traps?

[Pat Barthelow]

And three related questions:


1. Is the loss in gain, due to the RF lost/dissapated as heat, or due to pattern degradation
caused by "lumpy" current patterns along the elements?

2.  Is it reasonable to think you might lose 3 db to heat in the traps?
At, say, 500 watts input, 3 db is 250 watts of heat.  if evenly distributed inside 
six cylindrical aluminum traps with coils, (~45 watts per trap) would you expect smoke, or
melted coil forms with 45 watts of heat per trap?

3.  Does high SWR operating at the fringes of the resonance frequencies of a beam, say, phone for a CW tuned antenna, cause additional voltage or current stress to the traps? 

All the best,   Pat Barthelow   AA6EG  




> Date: Tue, 28 Oct 2008 14:22:36 +0000
> From: foxbw at comcast.net
> To: towertalk at contesting.com
> Subject: [TowerTalk] Lossy traps?
> 
> 
> 
> How “lossy” are traps on a trap tri-bander?   Some manufacturers of non-trapped tri-banders cite the lossy aspect of traps, but how real is that loss?   Can it be measured?   Would someone 500 or 5000 miles away notice the difference between a  trapped tri-bander and a similar tri-bander antenna without traps?  Notice I said tri-bander, not mono-bander, SteppIRs, etc. 
> 
> Anyone have any idea? 
> 
> TNX / 73, 
> 
> Barry - W1HFN
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