Topband
[Top] [All Lists]

Topband: Rx Ant Preamps?

To: <topband@contesting.com>
Subject: Topband: Rx Ant Preamps?
From: gary@noblepub.com (Gary Breed)
Date: Wed, 28 Jun 2000 13:14:28 -0400
Bruce

The scheme you propose may prove unsatisfactory.  The Pennant and Flag
antennas are independent of ground and must be isolated from the feedline.
A preamplifier will almost certainly have a common ground for both input
and output, and thus, no isolation of the "cold" side.

A transformer with separate primary and secondary windings is required,
or an autoformer style transformer plus a choke balun. I suppose you
could use a choke balun on the feedline side of a Hi-Z input preamp, but
you were trying to eliminate the transformer so it defeats your original
purpose.

A Beverage, EWE or K9AY loop operate against ground and do not require
such isolation (except when you feed a EWE in an upper corner).  Note
also that the K9AY loop and EWE work on exactly the same principle as the
Flag or Pennant (terminated loop), but with a ground connection. Unless
you require an elevated location such as a rooftop, you will see little,
if any, difference among any of these type antennas (of the same size).

73 and good luck!

Gary Breed
K9AY







--
FAQ on WWW:               http://www.contesting.com/FAQ/topband
Submissions:              topband@contesting.com
Administrative requests:  topband-REQUEST@contesting.com
Problems:                 owner-topband@contesting.com


<Prev in Thread] Current Thread [Next in Thread>