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Old April 10th 04, 08:19 PM
JGBOYLES
 
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Matching can be accomplished with a coil instead
of a shorted stub.


Thanks for explaining this matching technique in slightly different terms that
people may be more comfy with. I was trying to keep the parts count down since
this is a camping antenna. Using one 300 ohm line of correct length, shorting
the end, and tapping at the 50 ohm spot seemed pretty simple. Or as you state,
use the conjugate method and leave the line open and tap for 50 ohms.
These matching methods make use of the 1/50 conductance circles on the Smith
Chart. These easy matching methods will work for any SWR greater than Z0/50,
i.e. for Z0=300, for any SWR above 6:1. At the point where the SWR circle

crosses the 1/50 conductance circle, simply install an appropriate parallel
inductance or parallel capacitance and it twists the impedance at that point
to 50 ohms (48 ohms above).


I didn't know I was doing all that! Thanks for the info.

73 Gary N4AST
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