(no subject)

Hi All

I haven’t receive my USRP yet so i am trying to make some simple, USRP
independenent applications.

I want to implment FSK modulator by transfering a signal between two
laptops using the sound card ,the problem is i get syntax error when
using the block gr.not_bb() when trying to invert the incoming bit
stream at the input of the second mixer.

i searched the discuss gnuradio history as well as the documentation
made by Firas but found nothing.Excuse me if the the answer is laying
some where and i can’t find it …

Is there any similar block for such NOT function…

Thanks in advance

Note

i am using gnuradio 3.1.1 on Ubuntu Hurdy 8.05

I haven’t receive my USRP yet so i am trying to make some simple, USRP
independenent applications.

I want to implment FSK modulator by transfering a signal between two laptops
using the sound card ,the problem is i get syntax error when using the

You’d probably be better off using the gr.channel_model on a single
PC, the sound card method seems to introduce unnecessary
complication. Look at the benchmark_loopback.py example in the
examples/digital/ folder for an example on how to use it to test your
transmit and receive flowgraphs.

Jason

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