Ah, thanks for confirming. Just saw this, and of course no problem
with too short director/driven elements with this design. For through
the boom style the K2RIW design (Used also by K1FO) works well. Delrin
insulators and clips available from Directive Systems I believe, but
they aren't cheap. If you aren't making something to last 30 plus
years a wood boom and bit of glue works just fine. You are both likely
familiar with WA5VJB (Kent) "Cheap Yagi" designs and that might be a
good starting point for mechanical design.
W1AIM
FN34uj and elsewhere
On Wed, 26 Apr 2017 15:34:46 -0400
Ed Hutchinson <ehutch@xxxxxxxxx> wrote:
I suppose director elements of hollow tubing could be centered on a boom with "star washers" just a bit smaller than the OD of the tubes, or glue or silicon caulk...
On 04/26/2017 03:31 PM, Catherine James wrote:
This is a quagi design where the driven element and reflector are made of wire loops, not rod, so that's not a problem. Only the directors are made of the rod. Most elements are about 33 - 34"; I would have to look up exact length.
73,
Cathy
N5WVR
--------------------------------------------
On Wed, 4/26/17, Ed Hutchinson <ehutch@xxxxxxxxx> wrote:
I think 3' ends up being an inch or two short for driven and reflector
elements on 2M anyway. I have lots of 3" sections (more than a hundred)
of aluminum tubing (in several small diameters), it is very light and
quite strong but a bit hard to work with (and too short for all of the
elements of a 2M beam). Most is larger than 1/4".