Hi Chen Chen,
you really shouldn't use WORK_DONE if you don't want the flow graph to
shut down!
You could let the block that counts the 50 packets send a message to the
USRP source (assuming you use that), instructing it to tune to the next
frequency.
Best regards,
Marcus
PS:
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Discuss-gnuradio digest..."
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