[amsat-bb] Re: Cable question

John B. Stephensen kd6ozh at comcast.net
Tue Jan 8 16:47:26 PST 2008

Use a cable with a stranded center conductor and braided shield for the 
section that will move. I used the flexible version of LMR400 at my previous 
QTH. These have higher loss than other types, but solid center conductors 
and foil shields will fail in a year or so when flexed repeatedly.



----- Original Message ----- 
From: "Ollie Eisman" <ollie at earthrobot.com>
To: "AMSAT BB" <amsat-bb at amsat.org>
Sent: Tuesday, January 08, 2008 17:31 UTC
Subject: [amsat-bb] Cable question

> 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
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