All,
I have been experimenting with the Realtek dongle and am noticing some strange behavior.
There is one sampling rate that I can not seem to get to match up with the number of
samples that I'm receiving asynchronously. Specifically, when I try to sample at 514
kHz, I receive samples at approximately half this rate. Has anyone experienced something
similar?
I've tried looking through the Osmocom driver but everything looks good and it's
really odd that everything looks good for other sampling rates.
Just for reference, when I run rtl_sdr, I get the following device information:
Found 1 device(s):
0: ezcap USB 2.0 DVB-T/DAB/FM dongle
Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle
Found Elonics E4000 tuner
Any help would be appreciated!
Thanks,
Peter
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Hi Peter,
I had problems with the Realtek chip for sampling rates below 900kHz -
sounds as if you had more luck and there is only one bad rate.
But I see an other problem regarding the FIR-filter inside the Realtek.
This low pass has a cut-off frequency around 1MHz but is not very steep.
The ADC runs internally with the XTAL clock. This can cause additional
noise from mirror images, if the e4000 doesn't filter restrictive enough.
So I usually work with 2MHz or 2.4MHz sampling rate.
Regards Stefan