A.R.S. - WA5AM wrote:
On 9/5/07, D. Chester <[EMAIL PROTECTED]> 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
high.
Thanks Don, that's what I thought, and have indeed observed.
73, Brian
Yep! That is "one" of the quirks with the BC-610 coil and link.
You can get yourself a pile of grief with these old girls! They have
some, shall we say "interesting" characteristics when you mess with the
link coupling - AND - watch VSWR.
Then again, she'll get cranky dependent on the antenna system too!
I 'try' and stay away from the BC-939, and use tuned dipoles. It gets
out on the air better for me. Some have great success with the "long
wire" and BC-939. I just do not have the house, property, and
orientation, (N,S,E, & W), for that to do much good for me.
Bob - N0DGN
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