Bill etal,
I had a Pro-67C3 up for 15 years.
It survived Texas wind season after season, radial ice up to 1" thick on
more than one occasion, and more than one annual microburst with winds over
70 mph with driving rains. Not one mechanical issue. Antenna was on 110'
of R45G, 2" Chromoly mast, two thrust bearings and turned by a Yaesu
2800SDX/DXA series rotor.
I had a Pro-57B up for 10 years before this 67C3. Both performed well
on all the bands 40-10m.
Even on 40m cw band edge where on mine the swr was very high, using a
tuner it still worked anything I could hear.
I bought the Mosley's for their reliability and dependabilty.
Essentially zero service needs in 25 years. Not bad... In the same time I
had Hygain antennas loose element tips, 20m monoband Telrex Yagi wig-wag its
boom into two pieces, and lost a family of cush craft monobanders destroyed
by Texas storm in a matter of minutes.
Bill I think you will be happy with your choice.
73's Mike K9MK/5
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of AB2E
Darrell
Sent: Wednesday, August 15, 2018 1:51 PM
To: William J. Nicosia; towertalk@contesting.com
Subject: Re: [TowerTalk] My 3El 40M Experience
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@contesting.com> on behalf of William J.
Nicosia <WB2ZKX@optimum.net>
Sent: Wednesday, August 15, 2018 12:34 PM
To: towertalk@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
---
This email has been checked for viruses by AVG.
https://www.avg.com
AVG 2018 | FREE Antivirus & TuneUp for PC, Mac,
Android<https://www.avg.com/>
www.avg.com
Download FREE antivirus and malware protection. Tune up your PC, Mac and
Android devices for peak performance. Surf safely and privately, wherever
you are.
_______________________________________________
_______________________________________________
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
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|