[TowerTalk] 90 degree coax bend atop a crankup tower

[Larry Loen]

I have had about three years no problem in this situation.

What I did was to add an ordinary 90 degree galvanized angle bracket  (but
one that provided a little rounding) and put on a few cable ties on the top
and on the immediate down side for a little stress relief.  It seems to me
the only real issue is right at the bend and taking the stress off of it.
So far so good.  Mine might not even have screw holes in it, I forget. But,
I got it at the regular hardware store and it was just about as wide
(though flat) as the coax.  Put the bracket through the first cable "guide"
where it dropped.


WO7R

On Thu, Jun 4, 2015 at 11:07 AM, K7LXC--- via TowerTalk <
towertalk at contesting.com> wrote:

> >  Is there a preferred method of routing cables that doesn?t  involve a
> sharp
> bend like that? I?m imagining there?s quite a nasty impedance  bump going
> on
> here, not to mention the potential for physical damage to the  dielectric
> in
> the heat and cold, etc.
>
>     There are a couple of schemes for a larger  bending radius - I think
> Chris, KF7P has one. I've installed dozens of crank-ups  and guyed towers
> with
> hundreds of feedlines with the same technique of just  dropping them over
> the edge and I've experienced zero failures that I know of.
>
>     The only coax I'd worry about are the ones with  foam cores - they can
> cold flow over time and cause the aforementioned impedance  bump, perhaps
> even failure in extreme instances.
>
> >   If I?m going to spend hundreds of dollars in new  feedline, plus the
> costs of having it installed (I cannot climb,  myself)
>
>     Was there a problem with the existing feedlines or  are you just
> replacing them because they're old? I'm a big proponent of "If it  ain't
> broke,
> don't fix it". I don't want to discourage your from spending money  but
> maybe
> this is a very discretionary project that has more  psychological benefit
> than actual operational improvement.
>
> Cheers,
> Steve     K7LXC
> TOWER TECH -
> Professional tower services for amateurs
> Cell: 206-890-4188
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>