[TowerTalk] Coax choice for crank-up - looking for TT experience/recommendations

[Roger (K8RI) on TT]

The UF is about the most flexible I've seen, but durable it is not.
BuryFlex is not nearly as flexible, but more than good enough for 
rotator loops. It also has a very rugged and slippery jacket.

I had two pieces that looked good.  They were relatively short jumpers 
from the grounding block at the base of the tower to the NEMA panel 
where LMR600 runs to the shop and house, underground in conduit and a 
choke in the lead to the 75/40 meter sloping fan dipole.  There is no 
stress, or movement to these jumpers, tet the one from the grounding 
block has had the jacket split. The jackets for both jumpers have become 
porous to the point where the braid and foil are little mote than white 
powder.

The jacket on the LMR 400UF, looks good, but on removal of the jacket, 
the foil and braid display severe water damage.

Time in service is roughly 6 to 8 years in a relatively protected area.

73, Roger (K8RI)


On 7/11/2017 Tuesday 3:37 AM, Dick Green WC1M wrote:
> I've used LMR400UF and Davis BuryFlex on my US Tower 72' tubular crankup.
> Both worked, but the Buryflex is considerably more flexible.
>
> 73, Dick WC1M
>
> -----Original Message-----
> From: Alan NV8A [mailto:nv8a at charter.net]
> Sent: Monday, July 10, 2017 4:50 PM
> To: Samuel <shorton at juno.com>; towertalk at contesting.com
> Subject: Re: [TowerTalk] Coax choice for crank-up - looking for TT
> experience/recommendations
>
> How tight a coil can the hardline be coiled into. At present I have two runs
> of Davis BuryFlex taped together with the control cables for the SteppIR and
> the rotator, and being guided into a large trash bin when the tower is
> retracted. Would this work for hardline?
>
> 73
>
> Alan NV8A
>
>
> On 07/10/2017 03:04 PM, Samuel wrote:
>> Hi David...I have a US TOWER TX-472MDP and I have 2 runs of Andrews 7/8
>> hard-lines,one run LMR400 and Belden HD rotor wire all attached to a
>> 1/8"steel messenger cable tied to the top standoff and when I raise or
>> lower tower I have to walk them out into yard when I work on tower or
>> storms are expected...Was told I could not do it by some folks but it
>> works...Its not for everyone but I can tell you it works for me...Samuel
>>
>>
>> On 7/10/2017 12:15 PM, David Aslin G3WGN wrote:
>>> I'm putting together a new contest station and have already decided
>>> on/obtained LDF5-50A for the 150ft runs to the bases of the two
>>> crank-up towers.
>>> Looking for real-life experiences with cable choices for going up the
>>> telescopic crank-up towers.  Seems to me LDF Heliax (either 4-50 or
>>> 5-50) won't have sufficient flexibility for the job - the towers are
>>> likely to be up/down frequently for neighbour and passing storm
>>> reasons. Am I too cautious on that score or is a low-loss coax with
>>> stranded core like the Messi & Paolini Hyperflex/Ultraflex series or
>>> LMR 400/600UF a better bet?
>>> 73, David G3WGN  M6O
>>>
>>> _______________________________________________
>>>
>>>
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-- 

73

Roger (K8RI)