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[TowerTalk] Fwd: Fwd: Strain releif for vertical coax

Subject: [TowerTalk] Fwd: Fwd: Strain releif for vertical coax
Date: Mon, 25 Aug 2008 02:01:17 EDT
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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 
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
Sent: 8/25/2008  1:06:07 A.M. Eastern Daylight Time
Subj: Re: [TowerTalk] Fwd: Strain releif  for vertical coax

Rod Cunningham wrote:
>  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 
>> has  to be movable, but the rest can  just be taped in place. No, I 
>> recommend  you to  have the coax hanging along the boom but tape it there 
>>  Naturally, you  should keep the tape tension "just right" so you don't  
>> 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????


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