[Amps] Linearization problem

[Carl]

The typical phased vertical uses a 90 degree hybrid circuit which forces 
phase balance by dumping reflected RF into a dummy load.

Carl
KM1H


----- Original Message ----- 
From: "Gerald Williamson via Amps" <amps at contesting.com>
To: <manfred at ludens.cl>; <amps at contesting.com>
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?
>
> 73,
> Gerald K5GW
>
>
>
> In a message dated 12/4/2014 10:15:40 A.M. Pacific Standard Time,
> manfred at 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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