[TowerTalk] Anyone have experience using Davis bury-flex as their rotor loop

[Grant Saviers]

Hi John,

BuryFlex is my go to for loops (14 antennas on 4 towers).  One of those 
loops is 9913, had to buy it when BF was out of stock.  I was concerned 
enough about it last year that I did an examination and loss tested it, 
but it was ok. The tough PE jacket on BF makes it stiffer than 9913.

One trick I found is to have a standoff arm on the tower at the center 
of rotator travel.  The standoff is about 10", assuming the other end 
tapes to the boom out a bit further. This significantly reduces the 
chance of rubbing on the tower.

I had to do this on my ring rotators since they have a lot of parts 
outboard of the tower.  The tower end 2ft long standoff is hinged and 
follows the ring thru about 2/3 of a rotation.  So there are two "loops" 
one small one at the hinge and a large one from swing arm to ring.  That 
makes the total loop count 21.

Grant KZ1W

On 5/19/2020 05:18, john at kk9a.com wrote:
> This is confusing because the subject does not match the contents of the 
> post.  When people reply that this coax has worked well for them for 
> years I wonder which coax they are referring to - Bury-FLEX or LMR-400?  
> I purchased LMR-400 to make temporary antenna cables and I found it to 
> be quite stiff, at least compared to the Belden RG-213 that I have used 
> for years. So I sold it and bought LMR-400UF which is much more flexible 
> but unfortunately not good for long term outdoor exposure.
> 
> If cost is not a factor, what is the best rotator loop coax for HR?  
> What do the big stations like K3LR, K1LZ, W3LPL, etc use?
> 
> John KK9A
> 
> 
> Pete Raymond N4KW wrote:
> 
> I  plan to run LMR 400 up to the top of the tower, and the lowest loss
> coax for the remaining antennas on the mast. It's advertised as being
> flexible and capable of being used as a rotor loop.  Have you used it
> this way?
> 73, Pete, N4KW
> 
> 
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