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How to match 190 +j140 to a 50 ohm source?

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December 8th 07, 03:31 PM posted to rec.radio.amateur.antenna

Cecil Moore[_2_] Cecil Moore[_2_] is offline

Cecil Moore[_2_] is offline

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How to match 190 +j140 to a 50 ohm source?

wrote:
that about sums it up.

stub matching looks attractive, but how do I actually build one of
these suckers? Do I have to carve out a piece of coax and then fit
another one into it, if that makes sense? Won't that be nearly
impossible to solder?

physically, it would be easier to make a stub section with sections of
single wire line, but I don't know how to find Z0 of my 14 gauge wire?

The ARRL Handbook and Antenna Book contain the formulas.

Is stub matching not the answer?

How about replacing the stub with a capacitor.

The antenna is designed for about 450 Mhz, if that helps anyone.

At a point on the 50 ohm coax that is 8.75"*VF from
the 190+j140 ohm load, install a 14.2 pF cap to ground.
You can do it with a stub but a cap is much easier.
--
73, Cecil http://www.w5dxp.com

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