AN/GKA-5 Time-Division Data Link

Used at the GATR sites for SAGE radar sites and certain Direction Centers (sometimes followed with the AN/FRT-49 Amplifier / Transmitter), and also used at BOMARC "B" model missile launch sites. Its function was to decode and to transmit Time-Division Data Link (TDDL) information from a SAGE Direction Center (or a BUIC-II or -III site) to certain ADC interceptor aircraft and BOMARC 'B' missiles. So, the unit was typically referred to simply as the TDDL transmitter.