Hello GNU people, some help greatly appreciated.
I am a newbie to GNU Radio and have a lost samples problem, lost from the
USB 2 RF device, seemingly not in the Flowgraph signal chain.
Although I have no hard evidence I am coming to the point of suspecting the
problem lies with the running of GNU under Oracle VM, hosted by Win 10.
Physical RF device is a DVB-T+DAB+FM USB dongle, with Realtek RTL2832U and
the R820 device.
System is GNU Radio ( latest version ) running as a guest under Oracle VM,
hosted by Win 10 Pro on a machine with significant system resources.
Oracle version is VM 5.2.6r
Problem is **always** dropped samples from a DVB-T+DAB+FM USB dongle, tens
to hundreds of lost samples.
I have done the following :-
Added my name to the virtualbox users list.
added the Virtual Box Extension Pack 5.2.6 to allow USB 2 support
in the VM
Selected USB2 in the Oracle VM machine.
Blacklisted the RTL2338 DVB-T driver via
/etc/modprobe.d/blacklist-rtl.conf etc.
Tested with *rtl_test *with sample speeds from 2.4e6 down to 0.25 e6
Several Flowgraphs of various example FM broadcast receivers all have
choppy audio, believed to be due to lost sample from the RF device via USB2
and not seemingly due to mismatch of audio sing sample rates.
Using only the RTL_SDR source block and Low Pass Filter, plus the WX GUI
FFT Sink and the WX GUI Scope Sink, in a FlowGraph produces spikes in the
Audio which coincide with the suggested sample losses from the physical
dongle.
Under any and all tests and sample rates the result of* rtl_test *when ran
in the terminal is a continual stream of lost samples.
Other information;
running SDR# via the host system ( Win 10 Pro ) is faultless at 2.4e6
sample speed and all lower speeds.
I have also installed Gqrx in the VM and this system stalls with the
Terminal screen failing to enter the initial set up dialogue screen but
does list in the terminal screen the list of parameters, then hangs.
If anyone has input to the problem, I would be very pleased to hear back
and offer my thanks in advance.
John
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