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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