"Joe Rocci" wrote in message
news:EUwSc.9258$dG.759@trndny02...
Most people think of a directional coupler as a directional coupler, and a
splitter as a splitter. In reality, the splitter is simply the extreme
case
of a directioanl coupler where the coupling factor is 50%.

The fact that it was designed for 75 ohms is somewhat incidental. The
impedance on any of the ports is a function of the impedance on the other
ports. As to phase, it has to be well-behaved or you wouldn't have good
directivity.

Joe
W3JDR

Sure Joe,

you are right. I just never thought of it on that light.

Lets think about this phase thing, however. As long as there is the proper
phase cancellation _in_ the splitter, it will balance. This doesn't mean
that it is flat, does it? You'll be sampling the forward power somehow and
the reverse power with one of these and you need to have them both constant
with respect to each other--otherwise you cant measure phase.. If the fwd
sampler is the same thing do you get matching characteristics (ignore
secondary imperfections for now). I don't know how good ones are made, so I
have know first hand knowledge.
--
Steve N, K,9;d, c. i My email has no u's.