I said no change in swr... I should have been more specific.. I got
the same readings at 144.000, 146.000 and 148.000 on the original
length as I did on the shortened length. Sorry about the confusion.

-SSB

Frank Gilliland wrote:

On Thu, 04 Nov 2004 21:59:02 GMT, sideband wrote
in :


tnom:

Explain this, then... CB radio in my Peterbilt, with a mirror mounted
Hustler HQ-27 on the driver's side..



Nice antenna! Installed one recently and plan on getting one for
myself.



6 feet of coax shows a 1:1 on 19,
1.1:1 on 1, and 1.1:1 on 40... 12 feet of coax shows the same
readings... 18 feet of coax shows.. guess what? the SAME RESULTS.



Your antenna mount has a good RF ground. Coax length is going to make
little if any difference.



IT IS possible to get near "perfect world" results with a little work,
and attention to detail.

By the way, I've gotten similar results on two meters with a magnet
mount 5/8 2M Lakeview whip on my old Ford LTLA9000. Had to shorten the
coax because I was sick of the bundle of it in the cab... no change in
SWR over a four MHz bandwidth...



Now -that- I find hard to believe. If you get relatively flat
bandwidth over 4MHz then your antenna is basically nothing more than a
dummy load, and coax length doesn't matter there either.



There goes the "magmount theory" as well..



You didn't read the results of my tests a few months ago, did you?



If changing the length of the coax changes the SWR, then there is
something wrong with the antenna.



Absolutely correct, and the problem is an inadequate RF ground at the
mount, which is typical of mag-mounts (unless they are so heavily
loaded with resistance that they act like dummy loads).






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