[time-nuts] is there a cheap and simple way to measure OCXOs?

Bob Camp lists at rtty.us
Wed May 30 23:41:14 UTC 2012


HI

In the "on the cheap" category, you are probably better to simply ignore the 2 to 10 Hz region and skip to one of Bert's DMTD's for the close in stuff. 

Bob

On May 30, 2012, at 4:39 PM, shalimr9 at gmail.com wrote:

> 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 <attila at kinali.ch>
> Sender: time-nuts-bounces at febo.com
> Date: Wed, 30 May 2012 16:59:39 
> To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
> Reply-To: Discussion of precise time and frequency measurement
> 	<time-nuts at 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 <jimlux at 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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