"Sal M. Onella" wrote in message
...

"John Ferrell" wrote in message
...



Don't overlook that you can parallel two quads to get to 50 ohms as
well!


OK, I took a mental excursion in that direction. My first thought is to
use
two runs of RG-62 93-ohm computer drop cable off a t-connector. This goes
against my grain -- I've always hated using any t-connectors in a matched
system -- but I guess the match will be maintained.

My second thought is to literally parallel them at the end of a hunk of
50-ohm cable. That feed would need to be crossed over, I think, so the
fields would be additive. Easy enough to test it both ways, I suppose.
If
crossover is needed, what would the pattern look like without it?
Hm-m-m-m
... near-field cancellation and no pattern? Pattern rotation?

Of course I will be trying this next idea even if no newsgroup answer is
forthcoming: What happens if I tap off quad #1 on the side _opposite_
where I'm feeding it and connect quad #2 there? Wouldn't this additional
load reflect back to feed #1 and lower its impedance toward 50 ohms? I
don't know what feed #2 would be. Perhaps a jury-rig parallel line
calculated to be 100 ohms would do it. (# 10 AWG wires on 5 mm centers
would
do it.) Phasing will be an issue.
[I probably don't have a suitable test environment to tell success from
failure.]

73,
"Sal"



Stacking two 100 ohm impedance quads is electrically about as easy as it
gets. An electrical 1/4wl of any good quality coax from each antenna to a T.
50 ohm cable to the shack.


Jimmie.