[R-390] Limiter

[Gene Dathe]

As you say, the limiter doesn't do much for AM signals.  The real 
functionality is removing static crashes (lightning) from RTTY signals.  A 
major use of R-390As was the regular routine "chatter" between the various 
ships in the Fleet,  done with RTTY, and the limiter can remove the peaks, 
while providing a recognizable signal to the RTTY unit in the next rack...

73 de NA0G   Gene