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

jimlux jimlux at earthlink.net
Wed Mar 8 09:59:56 EST 2017


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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