The tower I am in the process of setting up was a crank-up in its past time.
It had an arm sticking out horizontal at the top of the top section. I was
told it held a wire to which the coax cables were all tided. When the tower was
in its lower position, all the coax were laying on the ground. With the
tower in "up" position the coax were just hanging next to the tower. Not my
idea
of a nice installation but apparently it worked. I could see something with
an arm on each level holding the coax but it still will have a lot of coax
hanging on the side of the tower when it's "down".
Hans, N2JFS
____________________________________
From: chasm@texas.net
To: towertalk@contesting.com
Sent: 8/25/2008 1:06:07 A.M. Eastern Daylight Time
Subj: Re: [TowerTalk] Fwd: Strain releif for vertical coax
Rod Cunningham wrote:
> HansLG@aol.com wrote:
>> Hi Michael,
>>
>> Dave, K1TTT, gave me the advice to tape the coax to the tower legs. Just
>> plain, good, electric tape. You should, of course, us some flexible coax
at the
>> point when you need the flexibility for the rotation of the antenna and
that
>> has to be movable, but the rest can just be taped in place. No, I
wouldn't
>> recommend you to have the coax hanging along the boom but tape it there
to.
>> Naturally, you should keep the tape tension "just right" so you don't
make
>> indentations in the coax.
>>
>> A story has it that when they installed the coax for a TV transmitter in
>> Gothenburg, Sweden, they managed to put the cable clamps at just the
right (or
>> wrong) distance that the combined reflections from all the clamps came
back in
>> phase with a catastrophic result on the SWR. I don't know if the story is
>> right but I am sure if you clamp or tape the coax you will not manage to
see a
>> noticeable result on the SWR.
>>
>> Good luck with your tower and antennas.
>>
>> Hans, N2JFS
I black zip tied my 5 or 6 coaxes to the Rohn legs and they have
lasted for about 4 yrs now. but, what do you do with coax with a
crank up tower.?? drop it inside the three 20' sections????
thanks
chas
k5dam
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