Re: UHD: USRP source issue when using 2 channels

[Ron Economos]

I have the same issue, but the error message is different.

Traceback (most recent call last):
  File "/home/re/xfer/uhdrx.py", line 213, in <module>
    main()
  File "/home/re/xfer/uhdrx.py", line 191, in main
    tb = top_block_cls()
  File "/home/re/xfer/uhdrx.py", line 97, in __init__
    self.uhd_usrp_source_0.set_center_freq(center_freq, 1)
  File 
"/opt/gnuradio-3.7.12git/lib/python3.6/dist-packages/gnuradio/uhd/uhd_swig.py", 
line 3600, in set_center_freq
    return _uhd_swig.usrp_source_sptr_set_center_freq(self, *args)
RuntimeError: LookupError: IndexError: multi_usrp: RX channel 
140641462873248 out of range for configured RX frontends

>>> Done (return code 1)

Ron

On 11/21/19 00:43, address@hidden wrote:
> Am I the only one facing an issue with fetching data from 2 channels of a B210 
> receiver ?
> When addressing a single channels (USRP Source -> file sink) all goes well, but
> whenever I activate a second channel (Num Mboards=1, Num Channels=2) I get an 
> error message
>
> tb = top_block_cls()
> File "/tmp/GPS.py", line 103, in __init__
> self.connect((self.uhd_usrp_source_1, 1), (self.blocks_null_sink_0, 0))
> File ".../gnuradio3.8/lib/python3.7/dist-packages/gnuradio/gr/hier_block2.py", 
> line 48, in wrapped
> func(self, src, src_port, dst, dst_port)
> File ".../gnuradio3.8/lib/python3.7/dist-packages/gnuradio/gr/hier_block2.py", 
> line 111, in connect
> self.primitive_connect(*args)
> File ".../gnuradio3.8/lib/python3.7/dist-packages/gnuradio/gr/runtime_swig.py", 
> line 5461, in
> primitive_connect
> return _runtime_swig.top_block_sptr_primitive_connect(self, *args)
> RuntimeError: port number 1 exceeds max of 0
>
> whatever sink (file, null) is attached to the UHD output. I am facing the issue
> with custom 3.8.0.0-rc2 (Python 3.7.5) or the current Debian/sid 3.8.0.0
> (Python 3.7.5) versions of GNU Radio Companion.
>
> The flowchart with the issue is at http://jmfriedt.org/GPS.pdf
>
> Thanks, JM