Thanks, Stuart.
I have an absolutely mint (10+) KW Matchbox but have only the docs for
the 250-watt Junior model.
What I would like to see for every tuner out there is a plot on a
Smith Chart for each band of the range of complex impedances that the
unit can match to 50 ohms resistive, and at what power levels. This is
not all that hard to actually measure ( requires only an antenna
analyzer and 50-ohm resistive load) and is a piece of cake to calculate
based on the tuner circuit.
This sort of detailed info would immediately separate the real tuners
from the component boxes.
Maybe some day . . .
72/73, George W5YR - the Yellow Rose of Texas NETXQRP 6
Fairview, TX 30 mi NE Dallas in Collin county QRP-L 1373
Amateur Radio W5YR, in the 55th year and it just keeps getting better!
Icom IC-756 PRO #02121 (9/00) Kachina #91900556 (12/99) IC-765 (6/90)
Stuart Rohre wrote:
>
> I just came into possession of the docs for the old Johnson Matchbox models,
> and they did list impedances of 50 to 2000 ohms as their range of
> adjustment. Too bad, this was dropped for the current makes of Tee circuit
> transmatches. They did not have a lot of info but they did list that.
> Another interesting thing was one model provided a place to hook up a user
> supplied wire whip inside the transmatch apparently to provide a tune up RF
> output indication, if you did not invest in the optional Johnson directional
> coupler (swr monitoring circuit). This probe could be hooked to a diode
> detector and DC meter.
> 73,
> Stuart K5KVH
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