Hello All,
I've got a simple setup in GRC whereby I record a basic ASK signal directly to 
a file from a USRP source. After recording the signal I can sucessfully play it 
back to a USRP sink. The problem occurs whenever I attempt to to skip the first 
step and playback a pre-recorded signal - theres no transmission from the USRP. 
Can anybody explain why this is? Is there some init done by the USRP source 
instance that isnt performed when the USRP sink is created in isolation?

Thanks.

Simon Denvir.
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