David Wrote on Nov. 24.
"I'd like to get the opinion of the IRCA brain trust on this. I just got a
pa0rdt active mini-whip, mainly to use traveling with an Afedri SDR. I
decided last night to use it to phase against my indoor Wellbrook. I had
mixed results--I could knock down all of my locals, but in all cases but
one I did not hear any usable audio from other stations.
What I was doing was to orient the Wellbrook to null my local as much as
possible, then phase it against the mini-whip. Is this the right technique,
or should I be aiming the directional antenna in some other fashion?"
David, When you phase a loop with a whip, the null will move to either end
of the loop depending on the phasing. Both antennas should be outside. It is
also possible that the phasing loss is too high and this may be degrading
the array s/n. You may need to fit a common mode choke to the next to the
Mini-Whip and use a ground rod for the Antennas RF return path, so as to
prevent the feeder being the antenna and picking up noise. Any signal
pick-up on the feeder can affect the phasing.
73
Andrew Ikin
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