SPCU SEGREGATED PHASE COMPARISON SYSTEM USING DIT-4 TONES OVER MICROWAVE TYPE A1A3A-X

SPCU-1A - SEGREGATED PHASE COMPARISON SYSTEM TWO SUBSYSTEMS (DELTA/GROUND) USING DIT-4A AUDIO TONES

SPCU-1A - SEGREGATED PHASE COMPARISON SYSTEM THREE SUBSYSTEMS (A/B/C) USING DIT -4A AUDIO TONES

SPCU-1A - SEGREGATED PHASE COMPARISON SYSTEM TWO SUBSYSTEMS (DELTA/GROUND) USING TCF POWER LINE CARRIER

SPCU-1A - SEGREGATED PHASE COMPARISON SYSTEM THREE SUBSYSTEMS (A/B/C) USING TCF-10 POWER LINE CARRIER

TYPE SPCU-1A SEGREGATED PHASE COMPARISON RELAY

TYPE SPCU SEGREGATED PHASE COMPARISON RELAY FOR USE WITH DIT-4 AUDIO TONES