[amsat-bb] Re: Cable question

[MM]

A 5500 rotor and two 18 foot antennas on a telescoping
mast?  Too much.
Suggest Roln 25 or better.
The mast will need a lot of Guys and the Top of the
mast may be too small to fit inside the cost-extra
mounting bracket for the rotor.
As for Coax,  I use LMR-600-UF.  I had all cables
custom cut and connectors pre installed. 
(davisrf.com)
The lmr-600 will cost you about $3+ per foot,  but..
for runs of less than 100 feet you can forget about
coax loss on all freq below 1.2 ghz.
This coax IS flexible enough to go around the rotor. 
If you are not using preamps, you can run 1 section
from the 
Radio to the antenna and around the rotors.
  My 5500 and array M2, with lmr-600-uf has been in
use for 4 years, no problems.
Any satellite that I can hear, I can work.

Wf1f
www.marexmg.org

--- Edward Cole <kl7uw at acsalaska.net> wrote:

> Either run LMR-400 all the way (70-foot) or for
> lower loss run 
> 50-foot 1/2-inch hardline (Andrew Heliax LDF4-50A) +
> 20-foot of 
> LMR-400.  Use N-female connectors on the hardline
> and N-male on the LMR-400.
> 
> The telescoping mast is not very rigid for a rotor
> and antennas so 
> you need guy lines at 10 & 20 foot levels.  Raising
> and lowering will 
> be tricky so you should have 2-3 people to help you.
>  Why not look 
> for two sections of Rohn-25 tower (used can be had
> for $50/section)?
> 
> Ed - KL7UW
> 
> At 08:31 AM 1/8/2008, Ollie Eisman wrote:
> >Hi everyone,
> >
> >I would like to use a G-5500 rotor on top of a 20'
> telescopic mast with
> >2m and 70cm sat antennas.  Assuming this isn't a
> bad idea to begin with,
> >my next goal is to find RF cables that will work
> best with this type of
> >tower given it will be raised and lowered
> frequently, thus causing a lot
> >of extra cable flex.  (I am not even sure of the
> best way to run cables
> >up the to rotors when the mast is telescopic -
> ideas?)
> >
> >I am looking at 20+' for the tower plus another 50'
> or so back to the
> >shack.  An suggestions?
> >
> >Love those covenants... :)
> >
> >73,
> >Ollie, AJ1O
> >_______________________________________________
> >Sent via AMSAT-BB at amsat.org. Opinions expressed are
> those of the author.
> >Not an AMSAT-NA member? Join now to support the
> amateur satellite program!
> >Subscription settings:
> http://amsat.org/mailman/listinfo/amsat-bb
> 
> 73,
> Ed - KL7UW
> ======================================
>   BP40IQ   50-MHz - 10-GHz   www.kl7uw.com
> 144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
> DUBUS Magazine USA Rep dubususa at hotmail.com
> ====================================== 
> 
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. Opinions expressed are
> those of the author.
> Not an AMSAT-NA member? Join now to support the
> amateur satellite program!
> Subscription settings:
> http://amsat.org/mailman/listinfo/amsat-bb
> 



      ____________________________________________________________________________________
Never miss a thing.  Make Yahoo your home page. 
http://www.yahoo.com/r/hs