Fw: RE: [Antennas] Some thoughts on baluns
Sandy and Kees Talen
[email protected]
Wed, 8 Jan 2003 20:46:19 -0600
True, that the typical 4:1 baluns can heat and increase loss. Choke
baluns, on the other hand are not meant to carry power, the coax
does. Their only purpose is to add impedance to prevent current
from flowing on the outside of the coax shield. Choke baluns
also offer no impedance matching.
73 Kees K5BCQ
--------- Forwarded message ----------
From: Pat W <[email protected]>
To: [email protected]
Date: Wed, 8 Jan 2003 18:14:45 -0800 (PST)
Subject: RE: [Antennas] Some thoughts on baluns
Message-ID: <[email protected]>
IT isn't always necessary to have a balun on feedline.
A simple test is to add some extra coax( best is 1/4
wavelength) and note resonance. If resonance changes
with additional coax, then the coax is radiating.
Note: THis only works when the feedline is all 50 ohm
line(and the xcvr output is also 50 ohms).
The wrong balun can also cause problems. Rerun the
test after adding the balun. THe wrong balun can also
heat up during transmission which will cause increasing
SWR due to heat.
Pat W0OPW
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