New modulation schemes do not work on my usrps while the old ones work

GNU Radio
1

hi,
I have the latest gnuradio installed on my Ubuntu 10.04 computers and
two
USRPs with RFX-2400 cards. I tested the benchmark_tx.py/benchmark_rx.py
and
benchmark_tx2.py/benchmark_rx2.py with dbpsk and dbpsk2 modulation
schemes
but only the old schemes work.

  1. With old schemes both usrps transmit and receive when tested in both
    tx/rx modes.
  2. With the new scheme one of the receive computer displays 'false ’ for
    almost all the packets received. I didn’t see any successfully received
    packets.
  3. One of the USRPs in the receive mode doesn’t even acknowledge a
    transmission and hence the benchmark_rx2.py script doesn’t print any
    thing
    on stdout.

What changes in parameters should I try in order for them to work?

Thanks

2

On 11/14/2010 08:38 PM, John A. wrote:

both tx/rx modes.

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Some modulation schemes are more sensitive to frequency offsets than
others.

Try that.