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

[Ahmed Majeed Khan]

Quoting "Johnathan Corgan" <address@hidden>:

>> $ python ./benchmark_rx.py -f 10M -R A --rx-gain=70 -v -r 500K
>> bitrate:         250kb/s
>
>> $ python ./benchmark_tx.py -TA -f 10M -r 500k -v --tx-amplitude=20000
>> bitrate:         500kb/s
>

Bitrate while using above command line arguments is 500kb/s at both, transmitter and receiver. 

> The transmitter and receiver are operating at different rates.  Try
> changing your transmitter to -r250k to match the receiver.

Changing transmitter to -r 250k makes transmitter rate 250kb/s, apparently creates a mismatch between transmitter and receiver. However, in either case, receiver console displays nothing for any packet reception. The outputs include:


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

>>> 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:
Using RX d'board A: Basic Rx
Rx gain:         70
modulation:      gmsk_demod
bitrate:         500kb/s
samples/symbol:    2
decim:           64
Rx Frequency:    10M


$ 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

$ python ./benchmark_tx.py -TA -f 10M -r 250k -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:         250kb/s
samples/symbol:    2
interp:          256
Tx Frequency:    10M


-Ahmed