Topband: Magic 'T' Combiners

[Larry Higgins]

> Larry is exactly correct here. In fact,  if the feedlines to both antennas
> are EXACTLY the same ELECTRICAL length, and the ends of these feedlines
> have the same impedance, when you "T" them together, you will get one-half
> that impedance at the "T" port. For two antennas that present 50+j0 ohms
at
> the feedline ends, this would result in 25+j0 ohms.

If each antenna's input impedance is 50 ohms, and each feedline is 70.7 ohms
and an odd number of quarter waves long, each 50 ohms is transformed to 100
ohms.  Two 100 ohm loads tied together in parallel is 50 ohms.

73

Larry, N9DX



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