On Thu, 4 Nov 2004 20:07:21 -0500, "M-Tech"
wrote in :

snip
Please explain how a poor "RF ground" can be corrected by increasing coax
length??


A given length of coax runs from the radio to the antenna mount. If
the shield is not adequately grounded (RF ground) then RF will crawl
onto the outside of the shield. When that happens your coax behaves
like an antenna, having resonant and non-resonant lengths. When that
happens, different lengths of the coax will put the antenna mount at
different phase angles, therefore changing the load impedance and SWR.
There are only two solutions: Provide a good RF ground to the antenna
mount (preferred), or change the length of the coax to 'tune' the
input impedance of the antenna.

That's all assuming your radio is fixed to a good RF ground.






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