[TowerTalk] A3W traps

[Todd Coulter]

Herb,
 
Maybe this will be helpful to you. It explains how to convert a Cushcraft A3 to 12m/17m.
 
 http://home.mchsi.com/~hidexa/antenna.html
 
73,
 
Todd 
N4JRZ
 
 
 

From: Herb Schoenbohm <herbs at vitelcom.net>
To: towertalk at contesting.com 
Sent: Monday, December 2, 2013 2:55 PM
Subject: [TowerTalk] A3W traps


I am looking to build a beam for the WARC bands to replace the wire antennas I currently use on 10/18/24 Mhz.  I think I have sufficiency learned my lesson in recent seemingly unending pile ups that the wire antenna  have put me through. Even a rotatable dipole high up at 90 feet should help out a bit better. I have many Cushcraft A3 traps collected from past storm damaged antennas but I think conversion to the WARC frequencies would be problematic.  I also have EX-14 traps but removing turns may not be all that easy. I have even considered trying to short out some turns but due to the aluminum sleeve construction measuring the results may not be accurate. Since the traps appear to be a simple series tuned circuit I have even considered putting them in series with the center conductor on a long piece of RG-58 terminated in a dummy load and hooking up my MFJ-259 analyzer to see where the bump occurs believing that wherever the trap is resonant after
 modification there should be some indication of it's presence.  But before I go through all this steamboat engineering of perfecting some WARC traps perhaps some of these are laying around for sale from a ham that had the A3W before puting up a real WARC band antenna.

If you have any please let me know and I will get out a Pay Pal payment or check to you.

Please let me know.


Herb Schoenbohm, KV4FZ
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