[time-nuts] PM-to-AM noise conversion
jmiles at pop.net
Thu Jan 17 20:45:43 EST 2008
Ah... that could very well be the case. The second lobe is so weak relative
to the first, that it's very easy to believe that harmonics generated in the
LNA were stronger. I'll bear that in mind when re-checking the measurement.
Sounds like another win for Occam.
-- john, KE5FX
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Bruce Griffiths
> Sent: Thursday, January 17, 2008 5:11 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] PM-to-AM noise conversion
> A simpler and more prosaic cause is distortion in the post phase
> detector amplifier.
> If this amplifier sees enough of the modulation frequency fundamental
> it could conceivably produce enough second harmonic by itself to produce
> the observed effect.
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