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

Richard Thorne rthorne at rthorne.net
Mon Jul 10 17:42:34 EDT 2017


Have you run the coax loss numbers on the intended frequencies?  You may 
find that going to hard line from the base of the tower is not worth it.

Try http://www.arrg.us/pages/Loss-Calc.htm I just used it to determine 
that RG-213 is plenty of coax to go up a rotating tower for a new 80m 
dipole and a 30m yagi.  While there is a difference between 7/8 hard 
line and rg-213 at those frequencies, the difference in loss is not 
worth worrying about.

Rich - N5ZC

On 7/10/2017 11:15 AM, 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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