Hello, I am trying to receive two channels at once with the USRP N210 and a TVRX2 daughterboard. My code to set up the top block is below:
class collect_double_tb(grc_wxgui.top_block_gui): def __init__(self,centerfreq0,filename0,centerfreq1,filename1,nsamples): grc_wxgui.top_block_gui.__init__(self, title="Top Block") _icon_path = "/usr/share/icons/hicolor/32x32/apps/gnuradio-grc.png" self.SetIcon(wx.Icon(_icon_path, wx.BITMAP_TYPE_ANY)) ################################################## # Variables ################################################## self.samp_rate = samp_rate = 20000000 ################################################## # Blocks ################################################## self.uhd_usrp_source_0 = uhd.usrp_source( device_addr="", stream_args=uhd.stream_args( cpu_format="fc32", channels=range(2), ), ) self.uhd_usrp_source_0.set_subdev_spec("A:RX1 A:RX2", 0) self.uhd_usrp_source_0.set_samp_rate(samp_rate) self.uhd_usrp_source_0.set_center_freq(centerfreq0, 0) self.uhd_usrp_source_0.set_gain(3, 0) self.uhd_usrp_source_0.set_center_freq(centerfreq1, 1) self.uhd_usrp_source_0.set_gain(3, 1) self.gr_file_sink_0 = gr.file_sink(gr.sizeof_gr_complex*1, filename0) self.gr_file_sink_0.set_unbuffered(False) self.gr_file_sink_1 = gr.file_sink(gr.sizeof_gr_complex*1, filename1) self.gr_file_sink_1.set_unbuffered(False) self._head0 = gr.head(gr.sizeof_gr_complex,int(nsamples)) self._head1 = gr.head(gr.sizeof_gr_complex,int(nsamples)) ################################################## # Connections ################################################## self.connect((self.uhd_usrp_source_0, 0),self._head0, (self.gr_file_sink_0, 0)) self.connect((self.uhd_usrp_source_0, 1),self._head1, (self.gr_file_sink_1, 0)) Then, to run this top block, I run: tb = collect_double_tb(f0,filename0,f1,filename1,nsamples) tb.run() tb = None The problem is, no matter what I set nsamples to, I always get a 17.4 kB file. Are there limitations with using gr.head this way with two channel reception? Or, is there a better way to g about collecting a specific amount of data with two channels receiving simultaneously? Thank you, SW -- View this message in context: http://old.nabble.com/Using-gr.head-with-multi-channel-receiving-tp33544858p33544858.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio