[amsat-bb] LMR-400 direct to antenna or no?

w4upd updwrb at bristor-assoc.com
Fri Apr 1 01:43:11 UTC 2016

I would do like I did to my 9913. This is rather stiff cable. I went a 
couple of turns loosely around the mast and around the boom for 
elevation. I would do this with the antennas at 0 elevation and 360/0 
degree azimuth. In this way it acts like a simple spring which opens or 
tightens slightly as the rotation of the mast and/or boom occur. I had 
my 9913 this way for over 15 years without a problem. I suspect the 
LMR400 should work the same. In this way you are not inducing any losses 
with additional cables and connectors.

Just my two cents.

Reid, W4UPD
Amsat: 17002

On 3/31/2016 9:35 PM, Scott wrote:
> I hope to put up my first rotating antenna soon and just received a nice length of LMR-400 to use. (regular, not "super-flex")
> Having never seen LMR-400 before, I did not know how flexible it would be.  I would call it "medium"... not stiff as a pipe but not floppy, either.
> My question is whether anyone using LMR-400 can recommend whether I should attach it directly to my antenna (with slack loops, of course)?
> Or, should I get a few meters of something more flexible to attach to an antenna that needs to be free to rotate 360 degrees?
> If a jumper is recommended, I would appreciate suggestions on what cable would work best for the task.  The frequency for this project is 70cm.
> Thanks!
> -Scott, K4KDR
> Montpelier, VA  USA
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