I am working with a USRP1. I eventually will want to transmit and receive data packets between USRP1s, but right now I am getting to grips with the system. I am currently trying out the benchmark_tx, benchmark_rx programs. I call benchmark_rx on my USRP1's LFRX-LF daughterboard and leave it running, sudo python benchmark_rx.py -f 10M -R A --rx-gain=70 -v -r 500k -d 128 bits per symbol = 1 M&M clock recovery omega = 2.000000 M&M clock recovery gain mu = 0.175000 M&M clock recovery mu = 0.500000 M&M clock recovery omega rel. limit = 0.005000 frequency error = 0.000000 Receive Path: Using RX d'board A: Flex 2400 Rx MIMO B Rx gain: 70 modulation: gmsk_demod bitrate: 250kb/s samples/symbol: 2 decim: 128 Rx Frequency: 10M I then call benchmark_tx on my USRP1's LFTX-LF daughterboard, sudo python benchmark_tx.py -TA -f 10M -r 500k -v --tx-amplitude=20000 >>> gr_fir_fff: using SSE bits per symbol = 1 Gaussian filter bt = 0.35 Using TX d'board A: Flex 2400 Tx MIMO B Tx amplitude 20000.0 modulation: gmsk_mod bitrate: 500kb/s samples/symbol: 2 interp: 128 Tx Frequency: 10M This prints out ...... etc signifying packets are apparently being transmitted. However when I flip over to the benchmark_rx console no packet notifications are being displayed. Is the USRP transmitting data? Why is it not receiving this data if it is transmitting? Furthermore is there a test/example program just for testing whether the USRP is transmitting through its antenna? For instance a program that gets the USRP to produce an audible tone out of its antenna?
on 2009-03-02 02:59
on 2009-03-02 05:08
On Mon, Mar 02, 2009 at 02:59:40AM +0100, William Sherman wrote: > > modulation: gmsk_demod > bitrate: 250kb/s > samples/symbol: 2 > decim: 128 > Rx Frequency: 10M Note that your -d 128 is overriding your -r 500k, resulting in a rx bitrate of 250kb/s. Leave out the -d option. > bitrate: 500kb/s > samples/symbol: 2 > interp: 128 > Tx Frequency: 10M Since you're using only the -r 500k option, you get the right answer, 500kb/s. > USRP is transmitting through its antenna? For instance a program that > gets the USRP to produce an audible tone out of its antenna? usrp_siggen.py Eric