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

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