In the microwave world one would follow the coupler with a circulator and
the energy reflected from the amplifier would dump into a dummy load.
The coupler would then "see" a constant load and the coupler sample would
be based on the same constant load.
Is there a circulator design made for HF?
73,
Gerald K5GW
In a message dated 12/4/2014 10:15:40 A.M. Pacific Standard Time,
manfred@ludens.cl writes:
Hi Marv,
> Directional coupler.
I don't see how that could work.
Indeed, if there was such a thing as a near-perfect directional coupler,
in
which the signal apearing on the side port depends _only_ on the signal at
the
input port, and also the coupler completely prevents the ouput load
changes from
affecting the input signal, then it would work fine. But I have never seen
such
a coupler! In all real-world directional couplers I know, the signal
appearing
on the side port varies when the load on the output port changes. So, in
my
application, the distortion caused by the amplifier on the drive signal
would
also appear at the coupler's side port.
Maybe I'm misunderstanding what exact type of coupler you mean, or how
you
would apply it. Can you give some example?
Manfred
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