Stuart:
The Johnson differs from modern balanced tuners in that it used link
coupling (a tuned transformer with inductive coupling) rather than a
matching network.
It also had the advantage over home brew link couplers that you tuned it
with knobs instead of moving little clips around on the big coil.
73,
Steve
AA4AK
At 02:14 PM 5/13/2005 -0500, you wrote:
The MFJ balanced tuner has a double tee network to give the most range of
adjustment.
Note even the vaunted Johnson Matchbox did not cover all of today's bands
and impedances.
-Stuart
K5KVH
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