On Tue, 13 Sep 2005 10:04:56 -0500, Bob Bob wrote:

Err why?

50r to 100r = 122r
50r to 75r = 90r

Cecil already gave you the answer. A 90-degree line is called a
"geometric mean" transformer.

The required impedance is the square root of the product of the
desired R and the load R.

Here's a little tutorial:

http://www.microwaves101.com/encyclo...uarterwave.cfm