[Amps] Transceiver Output Impedance

[Peter Voelpel]

The amplifier is happiest when the load is equal to the typically designed
Zout: 50 ohms resistive.

That practical loads might be different is another story and designers have
to take care of that by including circuitry to avoid unlinearity and
overload.

73
Peter

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Jim Brown


> For maximum power transfer the output impedance and the load must be 
> the same.

>NO!  This is a major misunderstanding of the maximum power transfer
theorem, which says that if a generator has a fixed 
>value of resistance (that is, we can change ONLY the load resistance) AND
IS LINEAR AT ALL OPERATING CONDITIONS INCLUDING >LOAD VALUES, that maximum
power will transferred when the resistances are equal.

That is my saying


Bottom line -- optimum load Z of a power amp is the impedance at which the
amplifier, including its output filter circuitry, is happy. And the value of
Z load is unlikely to be equal to the value of Z out. 

73,

Jim Brown K9YC 


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