On 9/29/20 8:06 PM, Pete Soper via TriEmbed wrote:
One more detail that might be of general interest. The place where you
attach the xmit output and ground to the two dipole legs determines the
feedpoint impedance. If you attach to the closest practical two
positions near the center the impedance will be at or near what the
model predicted last night. So don't attach further out from the center
thinking it's arbitrary. It gradually increases such that at the
opposite ends it's several thousand ohms (i.e. phenomenally high SWR:
all heat, no RF out).
I think I had sort of absorbed that idea just from looking at graphic
output from NEC2 (I found a cool port to C at http://www.5b4az.org/).
It seems like the "ideal" case would be to have the distance between the
inside ends of the dipole be as close to zero as possible without
actually touching, with the feed attached right at the inside edge. e.g.
[------------][------------]
||
||
You wouldn't want to do this:
[--------] [---------]
| |
Or this:
[------------][------------]
| |
My plan is to 3D-print a few little fittings to help line everything up.
Thanks again for the advice!
-B
-Pete
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