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@vitelcom.net>
To: towertalk@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
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|