[TowerTalk] My 3El 40M Experience

[AB2E Darrell]

I didn't see the early part of the thread so maybe somewhat out of context.

I agree with Bill.

I too picked up a Mosley Pro67C3, gain on 10-40m on a single boom. It's going up later this year on a 75ft crankup tower. My experience early 2000's at my local club station we had a Mosley Pro57. It generally performed well with good gain but the F/B was not great....so that would be my criticism. However, I picked mine up nib/old stock and it's nicely designed with pre-measured element pieces and all color-coded.

By the way, Ramon PZ5RA has a pair of them in service on 2 separate towers. He's always strong in contests.

Bill, wonder what rotor you are using that works well. I;m going to use my old Yaesu 2700-SDX, handles 35sq ft so should be plenty rugged.

The crankup will be the first part of my project (to get gain on 10-40 in one shot).

The 2nd tower going up will be 110ft of Rohn 25, with a pair of Hygain Discoverer-3 antennas phased for 40m.


OK best of luck with the project,

73 Darrell AB2E



________________________________
From: TowerTalk <towertalk-bounces at contesting.com> on behalf of William J. Nicosia <WB2ZKX at optimum.net>
Sent: Wednesday, August 15, 2018 12:34 PM
To: towertalk at contesting.com
Subject: [TowerTalk] My 3El 40M Experience

            OK, so I arrived somewhat in the middle of this thread re:
40M yagi construction, but here's my experience since 2009.

             I bought a second hand Mosley (criticize the design if you
must) PRO 67C3. This integrated tri-bander has 3el's on 40. No doubt
Mosley's designs are dated and can be improved upon electrically, but
mechanically, so far, my experience is that they are nearly indestructible.

             Upon receiving the antenna from the seller, I put it
through a through clean-up and refurbishment knowing that once hung at
70' I probably would have very limited access to it in the future. This
antenna has the benefit of a 3" boom which, rather than truss the
elements, I decided to truss the boom to reduce sag and to stabilize the
structure when in motion. The 40M elements are conventionally loaded and
so are slightly shortened, but they are HEAVY and create a LARGE turning
moment when in motion. This has proven, over time, to be the secret to
keeping this antenna in service. The elements are well enough double
sleeved, strong yet flexible, the boom, even the 3" option, needs
stiffening. A mast to boom truss made from coated wire rope, (criticize
that choice if you must), really gives this HEAVY antenna the super
strength it needs. As a testament to this set up, the PRO67C3 has broken
more rotors (ask W2GD) than any parts of the antenna itself.

             Bill, W2ZKX


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