[Discuss-gnuradio] Problem with RFX900 daughterboard

[M9607313]

Hi,everyone!
I'm trying to transmit square wave from one RFX900 at frequency 915MHz,and I 
use the spectrum analyser to receive the signal.That's right to work.But after 
several days,I want to transmit square wave from TX/RX port and receive it from 
RX2 port with two antenna.First I execute a terminal to run transmit 
program,then I execute the other terminal to run usrp_oscope.py receive the 
square wave.Two program run at the same time.At first I can see the square wave 
at scope sink,but in a moment the signal degrade a lot and became more and more 
strange.At the last test,I transmit the square wave from TX/RX and receive from 
spectrum analyser,but I can't see the signal anymore.I doubt RFX900 
daughterboard is breakdown.I add my square wave code.Could everybody tell me 
what's wrong about my experiment or my code?

Thanks for help
Henry

class filesource (stdgui.gui_flow_graph):
    def __init__(self,frame,panel,vbox,argv):
        stdgui.gui_flow_graph.__init__ (self,frame,panel,vbox,argv)

        
        src=howto.mysource(1000000,gr.GR_SIN_WAVE,40000,1)
        amp=gr.multiply_const_cc(8000)
        aa=gr.binary_slicer_fb()
        bb=gr.char_to_float()
        cc=gr.float_to_complex()
        self.connect(src,aa,bb,cc,amp)

        inter=128000000/1000000
        freq=915e6
        sink=usrp.sink_c(0,inter)
        subdev=(0,0)
        m = usrp.determine_tx_mux_value(sink,subdev)
        sink.set_mux(m)
        subdev1=usrp.selected_subdev(sink,subdev)
        print "Using TX d'board %s" % (subdev1.side_and_name(),)
        r=usrp.tune(sink,0,subdev1,freq)
        subdev1.set_enable(True)    
    
        self.connect(amp,sink)
 
        if 0:
           scope = scopesink.scope_sink_c(self, panel, sample_rate=1000000,
                                            frame_decim=1,
                                            v_scale=500,
                                            t_scale=0.000025)
           self.connect(amp,scope)
           vbox.Add (scope.win, 1, wx.EXPAND)

if __name__ == '__main__':
    app = stdgui.stdapp (filesource, "")
    app.MainLoop ()


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