Date: Tue, 20 Nov 2012 07:50:44 -0500
From: Steve Maki <email@example.com>
To: towertalk <firstname.lastname@example.org>
Subject: Re: [TowerTalk] hardline bending radius
On 11/20/2012 4:54 AM, Jim Thomson wrote:
> Date: Mon, 19 Nov 2012 13:35:01 -0500 (EST)
> From: K7LXC@aol.com
> To: email@example.com, firstname.lastname@example.org
> Subject: Re: [TowerTalk] hardline bending radius
>>> I recollect that the minimum bending radius for all coaxes is 6
>> the diameter. For 1/2" RG-8, that'd be 3 inches.
>> I think that's for coax with braided shield (the RG-8, RG-213) kind.
> It's an Andrew standard for their non-braided coaxes.
> Steve K7LXC
> TOWER TECH
> ## as a side note, if RFS brand heliax is used, the turning radius is one
> heck of a lot less
> than Andrew heliax. The RFS stuff uses a corrugated cu center conductor as
> well as the
> either cu or AL corrugated shield. Andrew heliax uses a copper tube on it?s
> 7/8? heliax...
> and also on its 1.25? heliax. The RFS stuff is flexible. IF you get the
> version with the
> AL corrugated shield, it?s also very very light. That AL outer shield version
> only comes
> in 2 sizes, 7/8? and also 1.25? . It?s a lot cheaper than andrew....esp if
> you get it at Davis RF.
> And of course, 7-16 Dins are readily available for both sizes. The RFS stuff
> is a heck of a lot
> easier to work with.
> later........ Jim VE7RF
That's a bit of over-generalization. Both RFS and Andrew make standard
and flexible versions of their cables. The construction is virtually
identical on comparable versions.
## since when did andrew start making 7/8” and 1.25” heliax with
corrugated center conductors ??
That andrew “flex” version of 1/2” heliax is nothing more than a corrugated
shield, making a sloppy fit
over the dielectric. All the andrew 7/8” + 1.25” heliax I have ever seen
always had a copper tube
in the center... = zero flex.
## I see andrew blathering on about the 1st to use corrugated aluminum for the
shield, but have yet to
see any andrew hekiax with an AL corrugated shield. Copper is 2-5% heavier
than steel and almost triple
the weight of aluminum. That RFS heliax with the corrugated AL shield + CU
corrugated center conductor
is the real deal.... super light,and super flexible, with no where near the
turning radius of standard andrew
## that ‘superflex’ andrew 1/2” heliax is spec’d to be rolled and unrolled
X many times off a cable reel, that’s it.
It uses Cu clad solid AL for the center conductor. Nick the CU..and you are in
a real mess, esp if you ring it 360 degs.
That CU copper tube used on the andrew 7/8” and 1.25” heliax is no fun to work
with...pita. You can have it.
Later...... Jim VE7RF
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