Re: [Discuss-gnuradio] 2 RTL-SDR dongles at the same time with GRC

[Rafael Diniz]

Concerning the B issue, may be you could synchronize the input sample
stream using an external reference pulse received by both sticks at the
same time?

Best,
Rafael Diniz

> On 08/23/2012 05:51 PM, Alberto Trentadue wrote:
>> Hello
>>
>> I am considering using 2 RTL SDR compliant dongles + GRC for some simple
>> interferometric application.
>> Having two
>> of such dongles, does anybody know if it is possible to have both
>> running as GRC sources?
>> If not, would it be possible
>> in theory (to be developed) or there is a strict architectural reason
>> preventing this?
>>
>> Thanks in advance
>> Alberto
>>
>>
> Assuming that you're using the gr-osmosdr source block, you can specify
> multiple devices:
>
> rtl=0
> rtl=1
>
> And so on.
>
> But be aware, there's no way to identify a "specific" RTL device --
> those numbers just mean "the first one that enumerated this time,
>    the second one that enumerated, etc".  For you application it may not
> matter whether you know on any given run which one is
>    which.
>
> Also, unless you can find a way to:
>
>      (A)  Synchronize the reference clocks for the two RTL-SDR dongles
> (relatively easy using a shared 28.8MHz oscillator)
>      (B)  Synchronize the sample stream (HARD!)
>
> You aren't going to have much fun with interferometry.
>
>
>
>
> --
> Marcus Leech
> Principal Investigator
> Shirleys Bay Radio Astronomy Consortium
> http://www.sbrac.org
>
>
>
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