Re: [Discuss-gnuradio] Problem with RFX900 daughterboard

[Matt Ettus]

First, the RFX900 is not intended to transmit to itself.

Why don't you try just sending a sine wave first?  The whole slicer,
char to floar, float to complex thing does not do what you think it
does.  Or, you could try sending the output of your system to a file
instead of a usrp.  Then you can see what it wrong with it.

Matt

address@hidden wrote:
> 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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