Tom W8JI wrote:
It takes exactly the same common mode impedance and common mode current
and voltage capacity in the balun if it is located at the tuner output
or at the tuner input when the network is a floating unbalanced
Probably true of the 1:1 configuration, but not of the 1:4
configuration. If you analyze the latter in terms of chokes, you have a
choke connected across the differential signal, so if the differential
impedance is high, most of the current would bypass the antenna.
Having a high impedance (short) antenna, is precisely when you might
think in terms of using the 1:4 configuration.
As an extreme case, consider what happens if you feed such a balun from
a high current DC source.
network. The core (if used) will get just as hot, and current unbalance
(except for stray capacitance or network transmission line effects) will
be exactly the same.
--
David Woolley
Emails are not formal business letters, whatever businesses may want.
RFC1855 says there should be an address here, but, in a world of spam,
that is no longer good advice, as archive address hiding may not work.
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
