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Re: [Amps] Linearization problem

To: <>, <>, <>
Subject: Re: [Amps] Linearization problem
From: "Carl" <>
Date: Fri, 5 Dec 2014 13:17:34 -0500
List-post: <">>
The typical phased vertical uses a 90 degree hybrid circuit which forces phase balance by dumping reflected RF into a dummy load.


----- Original Message ----- From: "Gerald Williamson via Amps" <>
To: <>; <>
Sent: Thursday, December 04, 2014 1:50 PM
Subject: Re: [Amps] Linearization problem

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?

Gerald K5GW

In a message dated 12/4/2014 10:15:40 A.M. Pacific Standard Time, 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,
which the signal apearing on the side port depends _only_ on the signal at
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
a coupler! In  all real-world directional couplers I know, the signal
on the  side port varies when the load on the output port changes. So, in
application, the distortion caused by the amplifier on the drive signal
also appear at the coupler's side port.

Maybe I'm  misunderstanding  what exact type of coupler you mean, or how
would apply it. Can you give some  example?


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