|[AMRadio] Re: Link coupling|
A.R.S. - WA5AM
ars.w5ami at gmail.com
Wed Sep 5 20:06:44 EDT 2007
On 9/5/07, D. Chester <k4kyv at charter.net> wrote:
> > This brings up a thought I've had about link coupled tuners, of which I
> > use.
> > Of course I feed the 50 ohm coax to the link. The center to one side
> > of the link and the shield (ground) to the other. What effect does
> > the "link position" have on a tuner? I suspect the link position
> > (mine is rotatable) would affect the matching impedance to the coax?
> > 73
> > Brian / wa5am
> If you have a variable link on the antenna tuner coil, there will be one
> and only one critical degree of coupling that will give a perfect matching
> impedance to the coax (assuming that impedance match is within the range of
> the tuner). Increasing the coupling will make the coax see too low an
> impedance, and decreasing the coupling will make the load impedance too
Thanks Don, that's what I thought, and have indeed observed.
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