To: | Dave N0RQ <n0rq-1@dfwair.net> |
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Subject: | Re: [TowerTalk] 80m 1/4wave vertical construction |
From: | Jerry Muller <k0tv@adelphia.net> |
Reply-to: | k0tv@arrl.net |
Date: | Fri, 24 Oct 2003 15:00:33 -0400 |
List-post: | <mailto:towertalk@contesting.com> |
Dave, I constructed a four square for 80 out of tubing from Texas Towers. I used the 6 foot sections (UPS shippable) and constructed it with eleven 6 foot pieces telescoping from the largest size they have. The overall vertical is 61 feet. My construction uses a 3 foot section of 2" electrical conduit at the base mounted to a 4 X 4 in a mailbox mount. A 1/2 inch lag bolt makes the hinge. A second 1/2 inch lag bolt could be used to brace it, but I don't think it's really necessary. You'll need three sets of guys total. I also used three 10 foot pieces of DAVIS RF Flexweave as the first 10 feet of the top set of guys making a capacity hat. The top set of guys is two sections down from the top at about 50 feet. I use four elevated radials 68 feet long constructed from #14 stranded wire from Home Depot (or was that Home Despot :-) ). The antenna as constructed direct feeds and covers the CW portion nicely. The best SWR is at 3.6 MHz. I add a series capacitor of 1000pf (be sure to use one rated for enough RF current) to put the antenna up into the phone band. I used one of these last year in the ARRL DX SSB weekend for something like 267Qs in 67 countries. I now have four of them up in a four square. I can't wait to see how they do this year. GL es 73, Jerry, K0TV The man who brought you (or at least paid for) the Marchand decision.... Dave N0RQ wrote: I am hoping to build an 80 meter 1/4 wave vertical, but have several practical questions. _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk |
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