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

jimlux jimlux at earthlink.net
Wed Mar 8 00:29:30 EST 2017


On 3/7/17 3:50 PM, bg wrote:
> Hi Jim,
> Did you look at the below article?
> http://www.rtl-sdr.com/a-multi-channel-coherent-rtl-sdr-product-for-passive-radardirection-finding-and-more/
> --     Björn
hadn't seen that one, but in my application the RTLSDRs are separated by 
substantial distances, so feeding a coherent reference isn't practical.

However, the bistatic radar is fascinating.  Juha Vierinen also has a 
nice bistatic ionosonde program for a USRP.

I've always wanted to build a radio camera using cast-off Ku-band DBS 
dishes/LNBs, and the block of RTLs would work nicely for that.



> 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?
>
>
>
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