[Amps] Linearization problem

[Radio WC6W via Amps]

I sent this to Manfred direct as an attachment but, that doesn't go with the reflector.

I found the source "on line" so, here is a link for any who are interested.

www.measurement.sk/2009/S1/Laurinavicius.pdf


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On Thu, 12/4/14, Manfred Mornhinweg <manfred at ludens.cl> wrote:

 Subject: Re: [Amps] Linearization problem
 To: amps at contesting.com
 Date: Thursday, December 4, 2014, 10:12 AM
 
 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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