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[TowerTalk] Trap End Covers

To: Towertalk <>
Subject: [TowerTalk] Trap End Covers
From: Steve Lawrence <>
Date: Tue, 28 Mar 2006 11:17:59 -0800
List-post: <>

My TH7 has exhibited high SWR, especially at high power, when it's  
wet. On my antenna, some of the DE trap cover drain holes were either  
misaligned or missing.

The trap end covers on the outboard end of the traps, that is the end  
furthest from the boom, should have drain holes. If not, pull the  
trap cover off or at least away from the body of trap before  
carefully drilling a pilot hole and then enlarge to 1/4 inch. The  
hole should be on the tapered part of the cover where it meets the  
larger circumference that fits onto the trap body. (No drain holes  
are on the covers on the inboard trap ends.)

Even if current production does not have these end cover holes, I  
would add them. This is something to be considered for trap end caps  
on any brand of trapped antenna.

It's also a good idea to make sure that the screws under the trap  
inboard end cover are hand tight.

At final assembly, the trap drain and end cover holes should all be  
in the same plane and aligned directly towards the ground.


73 - Steve WB6RSE

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