Andrew has a specification on how much of a vertical run you can support.
Please use the Andrew hoisting grips.
As I remember 1/2 inch LDF should be supported every 100 feet.
You can support the vertical cable run with a "messenger" cable to take all of
the stress of the cable hanging vertical.
I would contact Andrew directly and ask them (or Times if your are going to use
And remember Heliax is a trademark of Andrew. (NOT ANDREWS! as no many want to
Good luck on your project!
Date: Wed, 9 Jan 2002 10:33:58 EST
To: firstname.lastname@example.org, email@example.com
Subject: Re: [TowerTalk] Low Loss Coax
> In a message dated 1/9/02 5:47:42 AM Pacific Standard Time,
> firstname.lastname@example.org writes:
> > What is the minimum static bending radius on coax. Very few give that
> > detail.
> It's typically six times the diameter so the minimum bending radius for
> 1/2" coax would be three inches. I probably wouldn't stress foam-filled coax
> that much due to the potential for foam cold-flow problems.
> > And how do you deal with an installation of say LM-600 that has to
> > go horizontally then vertically (from the 12th floor apartment to the roof
> > 15th floor)? Is it OK to fit a 90 degree connector?
> Sure. But if you can put something under it to protect it from the sharp
> edge as it crosses the edge of the roof, then you don't really need the 90
> degree connector.
> > What sort of loss would there be? I have hear mention of 1.5db per
> It's not that much. Andrew, the Heliax people, use 0.2 dB per connector
> in their loss calcs. According to some guys on TT it's even less than that.
> Steve K7LXC
> Tower Tech
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This list is sponsored by the new eHam.net Store. When you buy products
like ICE filters, Array Solutions StackMatch, or M-Squared Antennas from
the eHam Store for the same price you pay direct, a portion of the sale
price goes to support this list. Check it out at http://www.eham.net.
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Administrative requests: towertalk-REQUEST@contesting.com