ACE-613A Command Encoder generates High-Alphabet modulation signal.

00Model ACE-613A Command Encoder was designed and developed specifically to be a direct replacement for its predecessor Model ACE-613. Model 613A unit is a micro-computer-controlled frequency synthesizer that generates the "High-Alphabet" range safety modulation format. It was designed as a test encoder for testing of various flight range safety receivers/decoders:

• Model CRD-118/204
• Model CRD-120/205
• Model CRD-124/207
  

As well as all future "High-Alphabet" CRDS.