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Re: [Discuss-gnuradio] RFX2400, really noisy signal


From: Matt Ettus
Subject: Re: [Discuss-gnuradio] RFX2400, really noisy signal
Date: Fri, 25 May 2007 16:27:40 -0700
User-agent: Thunderbird 1.5.0.10 (X11/20070302)


You need to control the gain

Albert Rodriguez wrote:
Has anyone achieved a good received signal with RFX2400? When I worked
without it , I had signals that went form 4000 to -4000. Now I'm using
the deinterleave and the received signal is really noisy when I see it
with the scope, and can't achieve up to -40 to 40 amplitude in the
scope. How's that?
I'd really appreciate any kind of help 'cause I can't understand
what's happening

...
    src = usrp.source_c(0, usrp_decim, fpga_filename="std_2rxhb_2tx.rbf")
    src.set_mux(gru.hexint(0x32103210))
src.set_nchannels(2) subdev_spec1 = (0,0)
    subdev_spec2 = (1,0)
    subdev1 = usrp.selected_subdev(src, subdev_spec1)
    subdev2 = usrp.selected_subdev(src, subdev_spec2)
    subdev1.set_auto_tr(True)
subdev2.set_auto_tr(True) subdev1.select_rx_antenna('RX2') subdev2.select_rx_antenna('RX2') r=src.tune(0,subdev1,freq)
    r=src.tune(1,subdev2,freq)
self.scope_1=scopesink.scope_sink_c(self,panel,'',sample_rate)
    self.scope_2=scopesink.scope_sink_c(self,panel,'',sample_rate)

    di=gr.deinterleave(gr.sizeof_gr_complex)
    fg = gr.flow_graph ()

    self.connect (src,di)
    self.connect ((di,0),self.scope_1)
    self.connect ((di,1),self.scope_2)
...


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