[time-nuts] Low Allan Dev Oscillators

John Miles john at miles.io
Tue Sep 3 03:01:56 UTC 2013


Very nice!  Up there with the best of them.   I'm curious about the measurements that are showing 100 kHz PN values in the -183 dBc/Hz neighborhood on your E5052B (
www.ptsyst.com/10MHzPN-2.pdf ) but only about -177 dBc/Hz on the TimePod ( www.ptsyst.com/10MHzPN-1.pdf ).  Was the same pair of oscillators being measured in both cases, and was the TimePod being used with dual independent references or a single reference?  

With dual references on the TimePod you should see results similar to the E5052B, but it looks like you used a single reference for the PN-1.pdf plot.  Something that reaches -176 by 10 kHz and then flattens out.  Wenzel ULN?

-- john, KE5FX
Miles Design LLC


> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Martyn Smith
> Sent: Monday, September 02, 2013 9:47 AM
> To: time-nuts at febo.com
> Subject: [time-nuts] Low Allan Dev Oscillators
> 
> Hello,
> 
> My colleague Steve  posted an Allan Dev plot of one of our 10 MHz
> oscillators.
> 
> It showed a funny hump at the beginning of the measurement.
> 
> The hump is just because the units were still warming up.  They hadn’t been
> on long before I started the measurement.
> 
> The problem is that we are always in a rush to supply these components and
> never have time to run them for 30 days.
> 
> I now have a few in stock and I intend to start  two of them up tomorrow and
> leave them for as long as I can and re-do the measurements.
> 
> I'll post the results when I have some meaningful results.
> 
> Regards
> 
> Martyn
> 
> 
> 
> 
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