I could be wrong... but I believe your not looking at an apples to apples
windload between the two.
I’m seeing 16.5 sq ft for the JK Mid Tri w/40m and 17.8 sq ft for the Optibeam.
Notice how Optibeam only lists one rating where as JK lists three which can
confuse things in that Ken is giving more information.
As for the aluminum being the same... way smarter guys here than me. I’ve been
curious of late if that’s really the case... I’ve been reading about some boom
failures at other stations of late and there are some very adamant hams talking
about the quality differences in aluminum used. Could just be angry folks, I’m
no mechanical expert.
If the original op is saying he’s mainly into the contests he’s probably going
to want to keep his contest yagi’s as clear of his WARCs as possible in order
to avoid possible interaction so that he obtains better performance during the
contests.
I first started out trying to do everything I could on 10 feet of mast sticking
out of Rohn 25G. Who knows what was happening with a TH7DX at the thrust
bearing, an A3WS/30m 5’ above and a XM240 driven element at 10’ above. Oh and
toss in an 80m inverted V a foot below it all! :)
Going forward I’ll put my WARCs on separate structures or as temporary wires as
needed. Just less for me to worry about when people aren’t returning to my CQ’s.
That’s me though. Try to make it so the scores aren’t so much limited by
hardware and more by me.
Tim / N6WIN.
Sent from Yahoo Mail for iPhone
On Saturday, May 5, 2018, 09:52, kstover@ac0h.net wrote:
I posted similarly a couple weeks ago and got some good advice from the
reflector.
It's come down to the JK Mid-Tri/40 and the Optibeam OB12-4W.
The JK is 40/20/15/10m, the Optibeam is 40/20/17/15.
The JK is less expensive, somehow a bigger windload, and built like a tank. It
has no WARC bands.
The Optibeam is more expensive, smaller windload (by about 5 sqft, not sure
how), built just as well as the JK and has 17m. I won't be caring too much
about 12 and 10 meters for a while. When the spots come back I'd need to get a
17/12m beam for the JK or a 12 and 10m beam for the Optibeam.
Either beam will be at 70-75 feet on an AN Wireless HD70 tower and 3" x .25
wall CMoly mast, Plans are to top things off at 90 feet with an JK 80 meter
dipole. When I started this, the plan was the Mid-Tri minus 40m, WARC band beam
half way up and an 402T at 90 feet. VE7RF advised I should consider the 40M
Mid-Tri and the 80m dipole. I have never had an 80m dipole that high much less
rotate it. It's always been very short verticals or very low dipoles.
Since I have never been on 6m I may stick a 6m Beam between them at 80 feet and
see what happens.
Rotator is going to be a SPID Big Rak.
R. Kevin Stover AC0H
ARRL, FISTS, SKCC, NAQCC.
One of the guys that made sneakernet irrelevant, in my little corner of the
world.
“If it doesn’t work the first time you push the button it won’t work the
20th…Just stop.”
-----Original Message-----
From: TowerTalk <towertalk-bounces@contesting.com> On Behalf Of rlvz--- via
TowerTalk
Sent: Friday, May 4, 2018 7:59 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Need recommendations for a 40-10m. Yagi
Guys,
I'm looking to purchase a 40-10m. Yagi this summer. It will be mounted on a
120' Self-Supporting Pi-Rod Tower in Wisconsin. I'd prefer the antenna to
cover the WARC bands but it's not imperative as I'm a contester first and a
DX'er second. Gain and reliability are my two greatest needs.
Note: I currently have a 3-element SteppIR at 50' so I do have WARC band
capability for 17 & 12m. I'd love for my Yagi at 120' to cover 30m. but it's
not a requirement.
A couple of questions:
1) If you were purchasing a 40-10m. Yagi this summer please advise which one
you'd purchase and why?
2) The antenna is probably going to have a windload between 15-20 sq. ft.
Please advise which rotor you'd purchase for it?
Thanks & 73,
Dick- K9OM
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