Pete, and others.
There is really no difference with an amplifier or active
antenna at the antenna end of a line versus passive
antennas for common mode problems. Mostly the common
mode currents are a result of a ground on each end of
these types of systems or another type of severe
unbalance at the end of the line.
Breaking that current flow between the grounds or
unbalance with a high impedance is still needed for
either type of termination.
Interestingly enough, one of the claims on the
Rauch/DXEngineering patent on the active antenna 4-square
receiving system is that resonating the DC carrying chokes
across the output common mode isolation transformer in an
active antenna amplifier increases the common mode
rejection. I would like to see how that works with an amplifier
that covers many octaves of bandwidth and a resonance being
usually fairly narrow band. Anybody know how that works at
more than one narrow band of frequencies?
The only dumb question is the one that is never asked.
Lee K7TJR OR
_______________________________________________
Topband mailing list
Topband@contesting.com
http://lists.contesting.com/mailman/listinfo/topband
|