Information about the sampling rate of the RTLSDR driver

frederic.evennou at orange.com frederic.evennou at orange.com
Mon Dec 17 08:56:51 UTC 2012


Hello,

I am testing a DVB-T USB key including the Elonics E4000 chipset and I want to check the sampling rate of this card.
I set up the sampling rate at 2.048 Ms/s (rtlsdr_set_sample_rate), and my storing buffer is 8*1024 bytes, so I expect receiving 1024 I/Q samples every 500 microseconds.
I am using the rtlsdr_read_async function to read the samples.
Unfortunately the loop in my program indicates that 8*1024 bytes are read every 2 milliseconds.
I am using the gettimeofday function to measure the time in microseconds.
Does this result mean that the best I can do is to read some samples every 2 ms at 2.048 Ms/s. This would mean that I am missing 1.5 ms of signal.
Is that correct or I am doing something wrong ?

Thanks for your help.
Frederic


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