[Discuss-gnuradio] GRC squelch block with separate control signal?

[John Ackermann N8UR]

I want to implement the equivalent of a carrier-operated relay -- a 
squelch block that provides an "on" signal at a threshold input signal 
level, which then passes or blocks data at some point further downstream 
rather than right at the point where the sensing is happening.

Are there GRC blocks that will allow this?

Thanks,

John