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[Discuss-gnuradio] Question about uO and FPGA

From: DiX
Subject: [Discuss-gnuradio] Question about uO and FPGA
Date: Thu, 28 Feb 2008 20:09:44 -0800 (PST)


    I am currently using USRP to do two-way relaying between d'b A and d'b B
(FLEX2400). The graph looks like

    rx_a -> tx_b
    rx_b -> tx_a

    Since there are one rx and one tx paths sharing the TX/RX port. The port
is used in time-multiplexing way. When I get something on rx_b, I
set_enable(True) on tx_a and set_enable(False) on tx_b. Then use rx_b->tx_a
to relay the data from b to a. I use set_mux(gru.hexint(32103210)) for rx
and set_mux(0xba98) for tx. 

    The problem is I have to use relatively high bit rate on these tx and rx
paths. The demic rate should be <=16, and interp rate <=32. When I run the
code with decim rate = 16 interp rate = 32, I keep receiving uO. My
questions are : what's the max rate the USRP can support in this case? and
is there any fatal fault in my graph design?

    Any help will be appreciated!


P.S. Attached is the simplified connection between rx and tx
        self.connect(self.rx_path.u, di)
        self.connect(intl, self.tx_path.u)


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