Forum: GNU Radio error with benchmark_rx program

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Sachin H. (Guest)
on 2008-10-29 23:47
(Received via mailing list)
I am facing a problem with On receiving side, sometimes
reporting problem with unpack module for payload. I have used the same
program previously too and didn't have any issue with the same. I am
confused what can be causing this problem. For you information, I am
Ubuntu 7.10 and 8.04 on different desktop machines with GNU Radio 3.1.1
Detailed snapshot of program execution is given below.

Please help me in this matter. Awaiting for a kind response.

- Sachin

/gnuradio-3.1.1/gnuradio-examples/python/digital$ ./ -f
-m dbpsk -v
Attach and press enter:
>>> gr_fir_ccf: using SSE

bits per symbol:     1
Gray code:           True
RRC roll-off factor: 0.35
Costas Loop alpha:   1.50e-01
Costas Loop beta:    5.62e-03
M&M mu:              0.50
M&M mu gain:         1.00e-01
M&M omega:           2.00
M&M omega gain:      2.50e-03
M&M omega limit:     0.01

Receive Path:
Using RX d'board A: Flex 2400 Rx MIMO B
Rx gain:         45
modulation:      dbpsk_demod
bitrate:         500kb/s
samples/symbol:    2
decim:            64
Rx Frequency:    2.4G
Warning: Failed to enable realtime scheduling.

ok = False  pktno = 3971  n_rcvd =  996  n_right =    0
Exception in thread Thread-1:
Traceback (most recent call last):
  File "", line 460, in __bootstrap
line 164, in run
    self.callback(ok, payload)
  File "./", line 61, in rx_callback
    (pktno,) = struct.unpack('!H', payload[0:2])
  File "", line 87, in unpack
    return o.unpack(s)
error: unpack requires a string argument of length 2

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