Johnathan, Thanks for the speedy response.
Is there any way I could use one USRP to both transmit and receive a signal? That is, I want to use benchmark_tx.py to send out a dbpsk modulated signal and use benchmark_rx.py to receive this same signal. Would this be possible? I'm using a FLEX400 daughterboard. I actually have two of them. Thanks, Jeffrey On 8/9/07, Johnathan Corgan <[EMAIL PROTECTED]> wrote: > > Jeffrey Ung wrote: > > > I installed GNU Radio on an Intel OSX machine (with the help of > > Michael Dickens (THANKS!)) and now I was wondering if it were > > possible to specify which USB port the computer should use when > > looking for the USRP. I ask because I want to connect two USRPs to > > the same computer and run on as a TX for dbpsk and the other as a RX > > for dbpsk. Is this even possible? If so, how would I go about it? > > It is possible to plug two USRPs in to the USB. > > If you are writing your own software, you'll need to add the 'which' > parameter to usrp.source_c() and usrp.sink_c(): > > src1 = usrp.source_c(which=0) > src2 = usrp.source_c(which=1) > > Unfortunately, many of the example programs are written to assume there > is only one USRP, including the digital 'tunnel' program. So you'll > need to modify these to accept a new command line parameter. > > Now which USRP gets assigned #0 and #1 is dependent on the order they > enumerate on the USB, first by bus, then by device. This may be > affected by which one is plugged in first or turned on first. > > It's possible, when writing your own code, to retrieve the serial number > from the source_c object and use that to determine which actual hardware > unit you've grabbed. > > The other caveat is that most motherboards share a single USB controller > for all their ports. So you're sharing the same 32 MB/s bandwidth > across two USRPs now, effectively halving the maximum RF bandwidth you > can work with if both USRPs are using the USB equally. > > -- > Johnathan Corgan > Corgan Enterprises LLC > http://corganenterprises.com >
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