Re: [Discuss-gnuradio] Discuss-gnuradio Digest, Vol 116, Issue 24

Interested in your advice:
* You need to set the wire format to sc8 (thats 2 bytes per complex
sample) to achieve 50 Msps over gigabit ethernet.

Where is this documented ?

We have an application using N210 and a sampling rate of 16.667 MHz. Some code fragments in Python include:

1. self._u = uhd.usrp_sink3(device_addr=options.address, io_type=uhd.io_type.COMPLEX_FLOAT32, 1)

2. def set_vector(self):
{ some stuff that opens an IQ file, text format, converts to complex using v=[ ( x[i] + 1j*x[i+1]) for I in range(0,len(x),2) ] }

3. tb.set_vector()


The observed RF output appears to be irregular, as if some samples have been skipped or the sample file is incomplete or ? Could we have an incorrect wire format or some other related problem ? There are no buffer underrun problems except when the focus is removed from the terminal window, when we get the stream of L's effect, now well known :-) .


George Kinal
Lead Engineer
MITRE E531 Signal Processing and Communications Analysis



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