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Re: PLL Phase noise and SSB



At a 1 kHz offset the phase noise should be less than -65 dBc -- this limits
the maximum SNR to about 30 dB in a 3 kHz bandwidth. -85 dBc would be
better. At a 10 kHz offset the phase noise should be -120 dBc or less, but
you can live with -90 dBc if there are no strong signals near the desired
signal.

John
KD6OZH

----- Original Message -----
From: "Frederick M. Spinner" <fspinner@hotmail.com>
To: <amsat-bb@AMSAT.Org>
Sent: Saturday, 06 January 2001 05:23 UTC
Subject: [amsat-bb] PLL Phase noise and SSB


> One quick questions for the experts out there on Phase noise with
> SSB signals...
>
> What is considered to be an acceptable and/or good amount of phase noise
for
> a narrowband SSB (or CW) receiver LO?  Also, is the proper measure point 1
> KHz from the LO freq, or some other unit of measure, like "close in phase
> noise"?
>
> Fred W0FMS
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