On 3/8/17 1:14 PM, Michael Wouters wrote:
The Allan deviation is not frequency stability - it's the ADEV of the noise
on the receiver signal.
In that article, I think the idea was that they fed a very stable tone
in, and so they're essentially measuring the ADEV of the LO.
He unfortunately didn't say what the signal he was feeding in was,
though. Or was he just integrating the white noise out of the box?
Well, I should get some of these tonight, and if all goes well, and
there's no panic at work, maybe I can hook one up and look at the 100
MHz maser signal downstairs.
Cheers
Michael
On Thu, 9 Mar 2017 at 3:00 am, jimlux <jim...@earthlink.net> wrote:
On 3/7/17 9:29 PM, jimlux wrote:
Sent from my smartphone.
-------- Original message --------From: jimlux <jim...@earthlink.net>
Date: 07/03/2017 22:08 (GMT+01:00) To: Discussion of precise time
and frequency measurement <time-nuts@febo.com> Subject: [time-nuts]
time/sampling behavior of RTL-SDR
Has anyone ever looked at the timing consistency/behavior of the cheap
RTL-SDR dongles?
That is, if you feed a sine wave in and get the samples out via the USB
interface, are there missing samples? What's the ADC clock look like?
If you had two of them, and you determine the relative phase of them at
some time t0, and you let it run for minutes, how far will it have
moved?
Aha, someone has measured the Allan Deviation (although they don't say how)
http://www.rtl-sdr.com/wp-content/uploads/2015/03/rtl_R820T2.pdf
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