Correct, and the specified Crosby clamps are the forged type, 3/16CCF.
More popular for ham use is the 3/16CCM, which is a malleable clamp having
lower strength and much lower cost. It has been a very long time since hot
dipped galvanized malleable clamps have been readily available. We only have
plated ones in stock and only for those that insist; we do not recommend
their use.
Conceptually one could use more than three clamps to achieve greater
strength. I have never seen data for that though. Originally the Rohn
recommendation when cable clamps were used involved also serving the seven guy
wire
strands for added strength. This is a really nasty job that few hams would
actually complete. Rohn even sold tool for that; CST which was easily
duplicated.
For many years the Big Grip BG2142 and BG2144 have been the termination
product of choice. They install in a fraction of the time needed for cable
clamps and serving the cable ends. The grips are very price competitive with
the CCF style clamps that were the prior choice.
I saw the note about using Chinese insulators with Big Grips. There are
some insulators available that are way too small to be used with grips and I
can see that as a problem. The correct insulator is model 502 from the most
popular insulator manufacturers. There is a different part number for
lesser known manufacturers and I don't know the numbers.
The only way I can see that the proper insulator could damage a Big Grip is
if it shattered under load or from flying debris in a storm. I personally
have never seen or heard of that happening. To reiterate: with a proper
sized insulator.
73,
Gerald K5GW
GM Texas Towers
In a message dated 6/8/2015 10:56:40 A.M. Central Daylight Time,
towertalk@contesting.com writes:
> Does anyone know of a vendor who stocks original style heavily
galvanised clamps similar or identical to the older 3/16CCM? Based on
what I paid
in 1980 and on-line inflation calculators, these should now run a little
over $1.00 apiece.
Well, I don't know if there ever sold for a buck but the industry
standard for years has been Crosby clamps. Available in lots of places.
Cheers,
Steve K7LXC
TOWER TECH
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