Usrp_nbfm_ptt.py

Hello Everyone,

I am studying the example "usrp_nbfm_ptt.py" I think it is 

narrowband fm
in push to talk application, there are three modules : ‘control stuff’,
‘receiver path’, and transmit path’ can any one explain me these in
detail?
I mean what the key down, key up do ? and how is it relate to
transmitter
and receiver???

Thank you…

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