[Discuss-gnuradio] Command Line Arguments for usrp transmission and reception

[Ahmed Majeed Khan]

Hi,
I posted my question a couple of days ago but could not get any response, probably because it was an over-datailed mail. Here, I am just posting a part of it,

Is there any problem if I do call benchmark_rx.py and benchmark_tx.py with following command line arguments?
$ python ./benchmark_rx.py -f 10M -R A --rx-gain=70 -v -r 500K
$ python ./benchmark_tx.py -TA -f 10M -r 500k -v --tx-amplitude=20000

While doing so, I am getting following outputs:

I called benchmark_rx on my usrp and left it running,

$ python ./benchmark_rx.py -f 10M -R A --rx-gain=70 -v -r 500K

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: Basic Rx
Rx gain:         70
modulation:      gmsk_demod
bitrate:         250kb/s
samples/symbol:    2
decim:           128
Rx Frequency:    10M


I then called benchmark_tx on my second usrp,

$ 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: Basic Tx
Tx amplitude     20000.0
modulation:      gmsk_mod
bitrate:         500kb/s
samples/symbol:    2
interp:          128
Tx Frequency:    10M

This shows packets are apparently being transmitted. However when I checked the console of second machine for benchmark_rx, no packet notifications are being displayed.

My Questions:
1- Is the USRP transmitting data?
2- Why is it not receiving this data if it is transmitting?

-Ahmed