Arne
Agree with you, those Hy gain clamps are great
not sure if they can be a direct installation in this tennadyne, but using 2
pairs with a aluminum will be killer
adding a aluminum plate to sit the PVC plate of the tennadyne for sure will
never slip in a good installation
One note, just to do not miss here the problem is that the Tennadyne Slipp
not is just HALF and the flat PVC
to secure the antenna to the mast.
the half clamp just cover less than 50% of the diameter of the mast, the other
is the pressure to the small area in the plate
as you can see here http://www.nn4zz.com/images/TiltPlate/Tennadyne-BMI.gif
a flat aluminum plate in 1 or 2 pieces can be the best solution to mount this
antennas free of slipping and do not stressing the
PVC antenna mounting plate, your clamps can vary but double SLIPP NOT, DXE
Saddle clamps, SteepIR clamps or the
Hygain clamps can be candidates to solve this slipping problem.
you want some more ideas, here with NN4ZZ
http://nn4zz.com/Adapter%20Tennadyne%20T12.html
J.Hector Garcia XE2K / AD6D
Mexicali B.C DM22fp / El Centro
P.O.Box 73
El Centro CA 92244-0073
http://xe2k.net
Tweeter @XE2K
________________________________
From: "N7KA@comcast.net" <N7KA@comcast.net>
To: dave arruzza <w1ctn@yahoo.com>
Cc: towertalk@contesting.com
Sent: Thursday, December 19, 2013 8:07 PM
Subject: Re: [TowerTalk] Slipp-Nott
I think many folks are missing a very easy fix (modification) to many antennas
that have poor boom to mast mounts.
I have a 52ft boom 5el 20M yagi (its heavy, about 170lbs) made from 2ea TELREX
3el 20M yagis. My boom to mast mounting consists of a 1/2" thick aluminum
plate approx. 18" long and 12" high (surplus find). To secure the plate to the
mast I used 2 pairs of the HyGain mast clamps, PN 102734, spaced about 4"
vertically apart to clamp to the mast. I enlarged the thru holes (8ea per
pair) to accept 7/16" hardened grade 5 instead of the 3/8", bolts for extra
strength. This antenna has been up for approx. 22 years and it has NEVER
rotated/slopped on my 2" mast (4130A519 alloy). It often sees winds in excess
of 70-90+ mph during the monsoon season here is Albuquerque, NM.
Mounting the boom to the plate does not require as much effort since there is
practically no torque of the boom. U-bolts with saddles will work just fine. I
used the standard TELREX mounting U-saddles.
OH, yeah, I used the same clamps on my CC 40-2CD, just 1 pair and it has NEVER
rotated/slipped on the mast either.
The HyGain clamps) are the best kept secret when it comes to building a yagi,
and worth every penny they cost.
For antennas with 2" booms I used the complete HyGain boom to mast assy. IMHO,
HyGain got this absolutely right.
Hope this is of some help.
Arne N7KA
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