[Amps] Non-linear subharmonics was: Nonsense, AL-1500 parasitic

[Maurizio Panicara]

Hi Jeff,

I've seen parametric as amplifiers in giant parabola dish at space ground
stations already in the seventies, so not really new for me although I
didn't really deal with any, my job was with on board solid state space
transmitters.
I'm not sure I understand what do you mean and what this matters with the
original topic.
Wasn't it a single frequency and possible subharmonics creation without
hetherodyne mixing ?
I see finally two generators in the circuit below, not a single carrier
oscillator.
Do I miss something ?

73,
Mauri I4JMY




>
> In general parametric amplifier theory uses an RF "pump" to dump energy
into
> a non-linear device, which then can look like a negative resistance
> terminating a transmissionn line.  And negative resistance terminations
have
> the characteristic of reflecting more power than incident.   Given gain
and
> a circuit, you can generate an oscillator...and that oscillator can
> injection lock to the pump...thus transforming input energy to
subharmonics.
>
> jeff, wa1hco