[TowerTalk] 6 mtr quad
Kelly Taylor
ve4xt at mymts.net
Tue Aug 30 12:55:21 EDT 2016
Sent from my iPhone
> On Aug 30, 2016, at 11:22 AM, Jim Thomson <jim.thom at telus.net> wrote:
>
> Date: Mon, 29 Aug 2016 18:52:14 -0500
> From: Courtney Judd <k4wi at k4wi.net>
> To: "Towertalk at contesting.com" <Towertalk at contesting.com>
> Cc: ACG <contest at alabamacontestgroup.org>, SECC <secc at contesting.com>
> Subject: [TowerTalk] 6 mtr quad
>
> I have been thinking about building a monster quad for 6 mtrs. I have
> googled quads and all about but came up with very little data to work
> with. I did find a 7 el regular spaced quad on 19 ft boom but I was
> thinking of more elements and wide spaced... I have several 44 ft 2 in
> booms or even a 60 ft 3 in boom. I wanted to stick this on my rohn 45 at
> 100 ft. Anyone have any ideas or can point me to a web site or reflector
> where i could find something like this? Thanks, Cort K4WI
>
> ## The problem with quads is the spreaders do nothing...except to
> support the (failure prone ) wire loops. The windload on the 4 x spreaders is a heck
> of a lot more than a simple yagi element.
>
> ## IE: you require 4 x 13 ft spreaders to build a 20m ele. Thats
> a total of 52 ft of spreaders..just to make one 20m ele = nuts. And
> double all of that for a 40m full size quad ele.
>
> ## My short 40M f12 eles are only 44 ft long....and my longer F12 40m eles
> as used on the f12 N series of 40m eles, range from 52-59 ft long.
>
> ## 6m eles are only aprx 10 ft long. Tha’s dead simple to make from .375 +
> .500 tubing. 6 ft center section of .500 tubing...with .375 tips. Use a 6 ft length
> of .500 tubing for the center section...and 3 ft sections of .375 tubing for each tip.
>
> ## Thats cheap at dx engineering. Quads are a pita. 4 x spreaders per ele, and
> some form of spider to mech connect all the spreaders..then onto the boom.
And that doesn't even speak to the PITA that is trying to get a quad airborne. It's bad enough on a freestanding tower, never mind a gutted tower.
At VE4VV, he had a four-element Gem Quad once. Emphasis on 'once.' It was an absolute KILLER on the air. Would burn bands open it was so hot. But it came down for wire repairs once and then went back up. The second time it came down (another controlled descent), it never went back up. Great antenna if you like climbing.
>
> ## a buddy has the m2 6m yagi...on the 52 ft boom. It’s a flame thrower..and light weight.
>
> ## quads + quagis went the way of the do-do bird. dont even go there.
>
> Jim VE7RF
>
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