If you can offset one enough to have the output from the dbm in the audio band,
you could use a sound card based spectrum analyzer to evaluate phase noise.
Some sound cards may work down to 10 Hz, but their performance there is usually
not specified. Bruce Griffiths has information on some high performance audio
cards and maybe he can chime here.
Using the 3 corner hat method, you could identify the relative phase noise
performance of three oscillators.
It will not help with longer term variations though.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-----Original Message-----
From: Attila Kinali <att...@kinali.ch>
Sender: time-nuts-boun...@febo.com
Date: Wed, 30 May 2012 16:59:39
To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
Reply-To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Subject: Re: [time-nuts] is there a cheap and simple way to measure OCXOs?
On Wed, 30 May 2012 07:18:12 -0700
Jim Lux <jim...@earthlink.net> wrote:
> Got a mixer around, so you can beat them against each other (or against
> your 5680)?
Not yet. I'm currently thinking about geting an mixer from minicircuits
for the ZX05-1L[1] and a low pass filter BLP-1.9[2].
But what then? The frequency offset is low enough that it is still
problematic to measure with standard measurements instruments.
And the phase noise.. out of question.
Attila Kinali
[1] http://217.34.103.131/pdfs/ZX05-1L+.pdf
[2] http://217.34.103.131/pdfs/BLP-1.9+.pdf
--
The trouble with you, Shev, is you don't say anything until you've saved
up a whole truckload of damned heavy brick arguments and then you dump
them all out and never look at the bleeding body mangled beneath the heap
-- Tirin, The Dispossessed, U. Le Guin
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