[amsat-bb] Re: Antenna question
JamesDuffey at comcast.net
Sun Sep 21 07:42:00 PDT 2008
On Sep 21, 2008, at 5:22 AM, Michael Heim wrote:
> My question is, to simplify mounting to a small diameter insulated
> boom, could such an element be placed "laying down", so the element
> could be better supported by drilling 2 holes in the boom?
Michael - W7ZOI built one of the WA5VJB Yagi antennas for 2M using a
driven element oriented just as you describe. He said it worked just
I think you want the long part of the driven element to be in the same
position in both antennas, but you may want to model it to verify
this. The position is not too critical for 2M.
In Kent's antennas, the position of the driver from the reflector
largely determines the impedance of the antenna, and the position of
the first director from the driven element largely drives the SWR
bandwidth. The gain sort of comes along from these positions for the
three element beam and when there are more than one directors, these
pretty much determine the gain.
They are nice antennas aren't they. I have built and used a half dozen
for various bands and they all work great as built. I use them at the
home station for terrestrial and satellite use, and in the rover. Now
if Kent would only make some longer boom designs available. - Duffey
Cedar Crest NM
More information about the AMSAT-BB