[Discuss-gnuradio] Unable to receive anything on receiver window !

[saketh kumar]

Hey 

  I am working on USRP N200 with RFX2400. My set up includes two USRPs connected to two computers. I want them to communicate using uhd_benchmark_tx/rx.py codes. Initially I set up my receiver side by running uhd_benchmark_rx.py and it's done! The I shift to transmitter side and run uhd_benchmark_tx.py. It starts to transmit ( it is shown on window as ........................................ ) but I cannot receive anything on receiver window. So, my Question is what I am transmitting is correct or not ? If yes, then why not I am able to receive anything on receiver side.
This is how it looks on both the sides.

RECEIVER :

address@hidden:~/gnuradio/gnuradio-examples/python/uhd_benchmark$ ./uhd_benchmark_rx.py -m gmsk -r 500k -v -S 2 --rx-freq=242M -F 10
linux; GNU C++ version 4.4.5; Boost_104200; UHD_003.001.002-ba0e3c8

receiver: 
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 1472 bytes
-- mboard0 is MIMO master

UHD Warning:
    Unable to set the thread priority. Performance may be negatively affected.
    Please see the general application notes in the manual for instructions.
    EnvironmentError: OSError: error in pthread_setschedparam
RX antenna: TX/RX
USRP Source: <gr_block gr uhd usrp source (2)>
Samplerate:  250000.0

UHD Warning:
    The hardware does not support the requested RX frequency:
    Target frequency: 242.000000 MHz
    Actual frequency: 2342.000000 MHz

UHD Warning:
    The hardware does not support the requested RX frequency:
    Target frequency: 242.000000 MHz
    Actual frequency: 2342.000000 MHz
>>> gr_fir_fff: using SSE
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:
modulation:      gmsk_demod
bitrate:         500kb/s
samples/symbol:  2.0000
Warning: Failed to enable realtime scheduling.

TRANSMITTER:

address@hidden:~/gnuradio/gnuradio-examples/python/uhd_benchmark$ ./uhd_benchmark_tx.py -m gmsk --size=100 -M 1 -r 500k --tx-amplitude=0.5 -v -S 2 --tx-freq=242M -F 10
linux; GNU C++ version 4.4.5; Boost_104200; UHD_003.001.002-5239879

sender: 
-- Opening a USRP2/N-Series device...
-- Current recv frame size: 1472 bytes
-- Current send frame size: 1472 bytes

UHD Warning:
    The recv buffer could not be resized sufficiently.
    Target sock buff size: 50000000 bytes.
    Actual sock buff size: 131071 bytes.
    See the transport application notes on buffer resizing.
    Please run: sudo sysctl -w net.core.rmem_max=50000000

UHD Warning:
    The recv buffer could not be resized sufficiently.
    Target sock buff size: 50000000 bytes.
    Actual sock buff size: 131071 bytes.
    See the transport application notes on buffer resizing.
    Please run: sudo sysctl -w net.core.rmem_max=50000000
-- mboard0 is MIMO master

UHD Warning:
    Unable to set the thread priority. Performance may be negatively affected.
    Please see the general application notes in the manual for instructions.
    EnvironmentError: OSError: error in pthread_setschedparam
TX antenna: TX/RX
USRP Sink: <gr_block gr uhd usrp sink (2)>
sampling frequency:  1M

UHD Warning:
    The hardware does not support the requested TX frequency:
    Target frequency: 242.000000 MHz
    Actual frequency: 4442.000000 MHz

UHD Warning:
    The hardware does not support the requested TX frequency:
    Target frequency: 242.000000 MHz
    Actual frequency: 4442.000000 MHz
>>> gr_fir_fff: using SSE
bits per symbol = 1
Gaussian filter bt = 0.35
Tx amplitude     0.5
modulation:      gmsk_mod
bitrate:         500kb/s
samples/symbol:  2.0000
Warning: failed to enable realtime scheduling
...........U....................................................................................................................................................

Thanks in advance

-- 
Saketh Kumar