Thanks Marcus,


Your recommended syntax seems to have fixed my syntax and channel number 
errors.  I thought the subdev specs were set for each daughter board, and 
since each board has 2 channels, I had only been specifying 2 suibdevs for 
each.



I was still getting this error:



  File "/home/jo13815/./Record_4Chan_X410.py", line 60, in __init__

    self.uhd_usrp_source_0.set_rx_agc(False, 0)

RuntimeError: RuntimeError: NotImplementedError: set_rx_agc() is not supported 
on this radio!





After commenting out the set_rx_agc function calls, the script now seems to 
run fine, and I get 4 data files.  I still need to check out the files to make 
sure they look correct, but they seem to be the correct size!



John





Try a subdev spec of:

A:0 A:1 B:0 B:1

Make sure you've set the source block to use 4 channels, also what device 
address and args are you using?

Do you get any error messages?   Please share them here.



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