RE: [amsat-bb] Clarc yagis

["Frederick M. Spinner" <fspinner@xxxxxxxxxxx>]

The bad news is that you might need to do some pruning overall because you 
are using the fiberglass rather than the wood for the boom material.  These 
were designed by Kent Britain, and I've asked him directly (last year at 
Dayton) what the effects of different (dielectric) materials were on these 
antennas.  It does turn out it makes a difference.  We've made rover 
antennas and had to redesign them to make them work when on 1" square Max 
Gain Systems fiberglass tubing.

At 70cm, it might not be enough to notice/care.  But due to his comments on 
these antennas, I'd avoid using fiberglass or PVC/ABS as the booms.

White paint or shellac works fine on protecting the wooden booms for quite a 
few years.

But otherwise, yes, place the coax on the side of the boom, as shown in 
Kent's instructions.  See either my site (http://www.fredspinner.com/W0FMS) 
or the CLARC site for feed details.

Fred


>From: David Carr <dc@dcarr.org>
>To: amsat-bb@AMSAT.Org
>Subject: [amsat-bb] Clarc yagis
>Date: Sat, 06 Mar 2004 12:34:15 -0600
>
>I just finished construction on a WA5VJB 6 element 435Mhz beam.  I have a 
>question though about where to attach the coax.  I'm using a 1" fiberglass 
>tube as the beam and the geometric midpoint of the driven element is 
>currently in the middle (inside) of the hollow fiberglass tube.  Is it okay 
>to solder the coax connections on the outside of the tube (.5" from the 
>geometric midpoint)?  The pictures on the Clarc website 
>(http://clarc.org/Articles/uhf.htm) are ambiguous.
>
>73s
>David Carr
>KD5QGR
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