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[TowerTalk] hardline bending radius

To: <>
Subject: [TowerTalk] hardline bending radius
From: "Jim Thomson" <>
Date: Wed, 21 Nov 2012 07:43:18 -0800
List-post: <">>
Date: Tue, 20 Nov 2012 07:50:44 -0500
From: Steve Maki <>
To: towertalk <>
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:
> To:,
> Subject: Re: [TowerTalk] hardline bending radius
>>> I recollect that the minimum bending radius for all coaxes is 6
> times
>> 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.
> Cheers,
> Steve K7LXC

> ## 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.

-Steve K8LX

##  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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