Cecil:

[snip]
Actually, there is a simple circulator in a Bird. That's how
it separates the forward stuff from the reflected stuff.
--
73, Cecil, W5DXP
[snip]

Nope!

The "thing" that separates the incident voltage wave from the reflected
voltage wave
is called a directional coupler [actually a bridge circuit].

A directional coupler is *NOT* a circulator. One can make a directional
coupler from
a circulator but not vice versa.

But, one can make a circulator from *three* or more directional couplers
arranged in a circle!

I'll post schematic circuits for "electronic" directional couplers and
circulators on
alt.binaries.electronics.schematics if you wish.

--
Peter K1PO
Indialantic By-the-Sea, FL.