hi..
 i are trying  to implement a transceiver function in gnu radio.what i want is 
that the usrp be in the transmitting mode for say a specified no. of packets 
and then it switches onto the receiving mode for another specified no. of 
packets. i have already seen usrp_nbfm_ptt.py which does exactly the same thing 
but it is event driven. i am not able to understand how does this switching 
exactly take place in that and how does by just making one flow graph we are 
able to switch. i have tried making it go automatically by using the 
start(),stop() and wait() functions of the flow graph but have not managed to 
do it. Maybe what i am trying is the wrong approach,so can anybody please 
explain how to do the above thing. i jus want that the event driven thing in 
usrp_nbfm_ptt.py switch automatically based on any criteria, be it no. of 
packets, time etc.
 
 thanks
 pratik hetamsaria 
       
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