[amsat-bb] Re: Your posting on AMSAT

Dave Guimont dguimon1 at san.rr.com
Sun Dec 7 20:04:00 PST 2008

>I saw your posting on AMSAT-BB about building a quadfilar. I have 
>those files and have been experimenting with various omnis for SAT 
>work. So far diploes, verticals, turnstiles, and a moxon. The 
>quadfilar was next on my list. I even scored some copper clad coax 
>for the task. For 70 cm it seems pretty tough to do the bending and 
>get it right. May I ask how you did that (a tubing bender, pliers, 
>other) and if you heated the copper wire first like they suggest.

Anneal the copper tubing for the three copper tubing filars, and it 
is very easy to shape, simply mark the dimensions on the tubing, and 
bend away...the length is much more important than the diameter of the bends.

And make good solder joints...heat proof dialectric on the coax one,. 
of course....teflon, and there are some others...

               Pulling for P3E... 

More information about the AMSAT-BB mailing list