On 12/20/2013 8:18 AM, john@kk9a.com wrote:
The T10 boom is not that long however I imagine that the log periodic in
not balanced as well as a conventional yagi. Even with some extra torque
from imbalance it not be that difficult to make a mast clamp that does
not slip without having to add outriggers. The Slipp-Nott
http://www.tennadyne.com/slipp_nott.htm [2] appears to use mast sleeves.
It has no finish shown so I am hoping that it is made from stainless
steel.
It appears to be a split mast sleeve with the two halve of the body made
of plastic encased in a steel frame. The diagram shows two empty
shells. The plastic would deform under pressure, giving an even
pressure on the split sleeve/collar . The gripping force can be altered
just by tightening the bolts. Depending on the material it looks like an
ingenious way to get even gripping all the way around. At least that's
what it looks like to me.
73
Roger (K8RI)
John KK9A
On 2013-12-19 22:29, K0DAN wrote:
I have a T10 on a nominal 2" mast. It has been up since around 1999. It was
put up before SlippNott was available.
I am in Kansas City area, subject to weird WX including occasional ice
loading and high winds. The T10 does not have much wind load but I think can
put some leverage on the boom.
A few times in the life of my T10, it (or the mast) slipped, moving as much
as 45 degrees. It's a heavy tower, rotor, thrust bearing, good hardware, all
heavy duty install which has withstood a lot of torture. I repositioned T10
and reset the nuts/bolts, and all has been good for a year. After the last
bolt-nut reunion, I couldn't move the T10 boom no matter how hard I leaned
or swung on it. Original T10 hardware was still holding fine. Whatever made
the antenna (but a smaller VHF array NOT move) is a mystery...go figure.
After that event I thought the SlippNott might be good preventative
maintenance, but I never did anything about it, and since then have not had
any wind-related rotation. So I'm also interested in the value-add for
SlipNott + type of antenna/
73
dan
k0dan
-----Original Message-----
From: john@kk9a.com
Sent: December 19, 2013 20:45
To: TOWERTALK@contesting.com
Subject: Re: [TowerTalk] Slipp-Nott
The T10 is not a huge antenna, it should not slip on the mast. Rather than
put a band aid on it, I would look and the mounting plate and clamping. Is
the plate strong enough or is it bending? What type of mast clamps does this
use? How many clamps are there? I am using DX Engineering saddle clamps on
significantly larger antennas and have yet to see any slippage.
John KK9A
To:"towertalk@contesting.com" <towertalk@contesting.com>
Subject:[TowerTalk] Slipp-Nott
From:dave arruzza <w1ctn@yahoo.com>
Reply-to:dave arruzza <w1ctn@yahoo.com>
Date:Thu, 19 Dec 2013 13:07:31 -0800 (PST)
List-post:<towertalk@contesting.com">mailto:towertalk@contesting.com>
To all...
I have a Tennadyne T10 that recently has started to slip on the mast. No
matter
how much I tighten the clamps slippage eventually returns and then I am off
the
bearing the rotor displays.
Tennadyne markets the Slipp-Nott. Does anyone on the reflector have real
world
experience using this item. Does it really work?
73
Dave
W1CTN
Radio Ansonia
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[2] http://www.tennadyne.com/slipp_nott.htm
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