No, that is an amplifier!!!
You really see it when you have the input power (S11) reduced to -30 dB or so.
High performance VHF/UHF GaAs FET preamps are usually pretty close toedge of their stability factors.???? And you do see this!
We will get into how the stability of the preamp is affected by the antenna andthe use of isolators another day.
Kent WA5VJB
PS? And we will save Parametric Amplifiers for another time! hihi????? (Para Amps have one port/connector?? That one connector is
???????? both the RF input and the RF Output!)
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On Tuesday, September 29, 2020, 7:05:34 PM CDT, Jim Allyn - N7JA <jim@...> wrote:
On Tue, Sep 29, 2020 at 12:14 PM, KENT BRITAIN wrote:
You would be amazed how many LNA's have a POSITIVE Return Loss.i.e. more comes
back than goes in!
That's not an amplifier, that's an oscillator.
