[time-nuts] time/sampling behavior of RTL-SDR

[Michael Wouters]

The Allan deviation is not frequency stability - it's the ADEV of the noise
on the receiver signal.

Cheers
Michael

On Thu, 9 Mar 2017 at 3:00 am, jimlux <jimlux at earthlink.net> wrote:

> On 3/7/17 9:29 PM, jimlux wrote:
>
> >> Sent from my smartphone.
> >> -------- Original message --------From: jimlux <jimlux at earthlink.net>
> >> Date: 07/03/2017  22:08  (GMT+01:00) To: Discussion of precise time
> >> and frequency measurement <time-nuts at 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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