Aghaa, Okay tnxs Cec... Too much sun and weird drugs.. (prescription of
course!)

Cheers Bob

Cecil Moore wrote:


Bob Bob wrote:

Err why?
50r to 100r = 122r


SQRT(50*200) = 100

50r to 75r = 90r


SQRT(50*100) = 70.7

Do I have the calcs right?

Wes Stewart wrote:

Okay. 75 ohm is -still- better than 100.


SQRT(50*140) = 84 ohms. Z0=75 ohms is closer to
84 ohms than is Z0=100 ohms. If you had a 200 ohm
feedpoint, Z0=100 ohms would be perfect.