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Turn Off Signal After Single-Epoch of Modulation

Question asked by RadarGuy on Dec 29, 2011

I'm using the E4438C "Real Time I/Q Baseband Generator" to produce a QPSK signal from a user-defined file (with 1 second worth of symbols).  I configured the system to single-run and external trigger, so it only generates the 1 second modulation at the rising edge of the trigger.  The problem I have is that at the end of the 1 second modulation the system continues to transmit the final symbol, which here produces a tone. 

I need to determine a method to have the signal completely shut off after the final symbol.  Is a setting option that produces this effect?  FYI, I have available a TTL pulse that corresponds to the time I want the system to shut off.  Is there any way to use that to trigger the system to turn off the RF power?

Any help would be appreciated.