The reason CBers are trimming their coax is to try and provide a
better load for the transmitter when there is a mismatched antenna.

The feed line in this case acts as an impedance transformer. You know
about them don't you Larry? You remember, a quarter wave line will
transform a short to a high impedance, a half wave line will transform
a given impedance on one end to the same impedance on the other end
regardless what the impedance of the cable is.

Some times trimming the length of the cable can make the feed point at
the transmitter closer to 50 ohms than it was. But the SWR on the
cable will always be the same regardless of the length. That is
determined by the match between the cable and the antenna.

Regards
Gary


On Fri, 21 Nov 2003 03:52:31 GMT, (Larry W4CSC) wrote:

On Thu, 20 Nov 2003 19:08:37 -0500, "Doug Dotson"
wrote:

Wouldn't phase be a problem? Hard to believe that a signal can
be reflected back from the antenna and then reflected back from the
transmitter to the antenna and will be in phase well enough to actually
do any good.

Doug, k3qt
s/v Callista

Isn't that why these CBers are trimming the length of the
coax?.....(c;


Larry W4CSC

NNNN