[Discuss-gnuradio] only zeros in dual-channel-mode

[wolfgang buesser]

I am trying to build a network analyzer using usrp and LF RX/TX- so i need
one TX and two RX-channels. However I only get noise lcose to zero on the
secon channel:

Here is what I am doing in the RX_path (in brief). Maybe somebody can spot
the mistake:

        self.rx = usrp.source_c(0,decim_rate=128,
fpga_filename="std_2rxhb_2tx.rbf")
        self.rx.set_nchannels(2)  
        self.di=gr.deinterleave(gr.sizeof_gr_complex) 
        self.dst_r = gr.file_sink(gr.sizeof_gr_complex, "test_r.dat") 
        self.dst_t = gr.file_sink(gr.sizeof_gr_complex, "test_t.dat") 

        self.rx_r_subdev = usrp.selected_subdev(self.rx, (0,0))
        self.rx_r_subdev = usrp.selected_subdev(self.rx, (1,0))

        self.rx.set_mux(gru.hexint(0xf0f0f0f0)) # expecting to get port A of
side A on both channels

        rrx_r = self.rx.tune(0, self.rx_r_subdev, 10e6+1e3) 
        rrx_t = self.rx.tune(0, self.rx_t_subdev,  10e6+1e3) 

        self.head_r = gr.head(gr.sizeof_gr_complex, 1000) 
        self.head_t = gr.head(gr.sizeof_gr_complex, 1000) 
        self.connect(self.rx,self.di) 
        self.connect((self.di,0),self.head_r, self.dst_r) 
        self.connect((self.di,1),self.head_t, self.dst_t) 
        self.connect (self.siggen, self.tx)

I get nice data in test_r.dat but only noise close to zero in test_t.dat
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