Two Tx channels, one motherboard (N200+LFTX)

GNU Radio
1

Hi,

Is it possible to use two separate Tx channels (A:A A:B with two
different
center frequencies) for the N200 with the LFTX daughterboard?

I tried to do this on the Rx side and it seems to work just fine.
However,
on the Tx side, I am getting the following error message:

line 97, in init
self.uhd_usrp_sink_0.set_subdev_spec(“A:A A:B”, 0)
File
“/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py”,
line 3447, in set_subdev_spec
return _uhd_swig.usrp_sink_sptr_set_subdev_spec(self, *args,
**kwargs)
RuntimeError: ValueError: The subdevice specification “A:A A:B” is too
long.
The user specified 2 channels, but there are only 1 tx dsps on mboard 0.

Thanks.

Best regards,
Khalid