Re: [Discuss-gnuradio] Saving transmitted data from USRP2 to a file

[hjaffer]

Thanks for responding but I couldn't get your code to work. I get the
following errors when I incorporate your code into various files: 

AttributeError: 'app_gui' object has no attribute 'connect'
AttributeError: 'gr_top_block_sptr' object has no attribute 'source_usrp'

I have a USRP2 by the way. Not sure if source_usrp will only work for the
first version. 



Hafeez



Amit Kulkarni-6 wrote:
> 
> hjaffer wrote:
>> Hello All,
>> 
>> I am using the Python example program "usrp2_siggen_gui.py" and wanted 
>> to
>> save the transmitted data to a file. I added the following lines:
>> 
>>         self.u = usrp2.source_32fc(self.tb.interface_name(),
>> self.tb.mac_addr())
>>         self._sink = gr.file_sink(gr.sizeof_gr_complex, 'test.txt')
>>         self.tb.connect(self.u, self._sink)
>> 
>> The addition of the above lines cause what appears to be random data
>> (noise?) transmitted to my spectrum analyzer.
>> 
>> What is the correct way to record what is being transmitted? And does
>> anybody know why there isn't a Python program that transmits a recorded
>> file? I can record to a file and view it nicely in Matlab. I can 
>> transmit a
>> signal and view it on my spectrum analyzer nicely. But I cannot seem to
>> record and play back a file.
>> 
>> 
>> Thanks for answering my questions!
>> 
> 
> this is the code i am using to write:
> 
> nsamples = 20000   #number of samples to write
> filename = "rxsamples.dat"   #file name
> 
> self.dst_file = gr.file_sink(gr.sizeof_gr_complex, filename)
> self.head = gr.head(gr.sizeof_gr_complex, nsamples)
> self.connect(self.source_usrp, self.head, self.dst_file)
> 
> and to read:
> 
> self.src_file = gr.file_source(gr.sizeof_gr_complex, filename, True) 
> #True for repeat data at end of file
> self.connect(self.src_file, self.sink_usrp)
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> 
> 
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