[USRP-users] Communication Problem between two USRP's

Vsr Ravi vsr_ravi at yahoo.com
Thu Jul 30 18:32:48 EDT 2015


Hi all,
I want to transmit the data between two USRP's and make them communicate
with each other. But I guess the packets are not being received
properly. My USRP daughterboard model is XCVR2450. When I am running
./benchmark_tx.py -f 2.435G, it is starting to transmit the packets but
a small error occured given below,

linux; GNU C++ version 4.8.4; Boost_105500;
UHD_003.009.git-144-g407e3086

Using Volk machine: avx_64_mmx
-- Opening a USRP1 device...
-- Using FPGA clock rate of 64.000000MHz...

No gain specified.
Setting gain to 7.500000 (from [-20.000000, 35.000000])

UHD Warning:
    The hardware does not support the requested TX sample rate:
    Target sample rate: 0.050000 MSps
    Actual sample rate: 0.250000 MSps

Symbol Rate:         25000.000000
Requested sps:       2.000000
Given sample rate:   250000.000000
Actual sps for rate: 10.000000

Requested sample rate: 50000.000000
Actual sample rate: 250000.000000
..............................................................................................U...............................................................terminate
called after throwing an instance of 'uhd::runtime_error'
  what():  RuntimeError: usb tx2 transfer status: 1
Aborted (core dumped).


But towards the receiver side, I gave the command ./benchmark_rx.py -f
2.435GG,it has shown the result given below with n_right=0.


linux; GNU C++ version 4.8.4; Boost_105500;
UHD_003.009.git-144-g407e3086

Using Volk machine: avx_64_mmx
-- Opening a USRP1 device...
-- Using FPGA clock rate of 64.000000MHz...

No gain specified.
Setting gain to 56.250000 (from [0.000000, 112.500000])

UHD Warning:
    The hardware does not support the requested RX sample rate:
    Target sample rate: 0.050000 MSps
    Actual sample rate: 0.250000 MSps

Symbol Rate:         25000.000000
Requested sps:       2.000000
Given sample rate:   250000.000000
Actual sps for rate: 10.000000

Requested sample rate: 50000.000000
Actual sample rate: 250000.000000
ok = False  pktno = 53034  n_rcvd =    1  n_right =    0
ok = False  pktno =   24  n_rcvd =    2  n_right =    0
ok = False  pktno =   35  n_rcvd =    3  n_right =    0
ok = False  pktno =   44  n_rcvd =    4  n_right =    0
ok = False  pktno =   46  n_rcvd =    5  n_right =    0
ok = False  pktno =   46  n_rcvd =    6  n_right =    0
ok = False  pktno = 3872  n_rcvd =    7  n_right =    0
ok = False  pktno = 12304  n_rcvd =    8  n_right =    0
ok = False  pktno =   49  n_rcvd =    9  n_right =    0
ok = False  pktno =   50  n_rcvd =   10  n_right =    0
ok = False  pktno =   54  n_rcvd =   11  n_right =    0
ok = False  pktno =  200  n_rcvd =   12  n_right =    0
ok = False  pktno =   63  n_rcvd =   13  n_right =    0

My USRP can access in the range of 2.4GHZ to 5GHZ. Please advice as to
what I can do. Thanks

Regards,
John
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