SMALL, LIGHT-WEIGHT ALTITUDE TRANSMISSION EQUIPMENT
HAZELTINE TECHNICAL DEVELOPMENT CENTER INC INDIANAPOLIS IN
Pagination or Media Count:
Both SLATE I and SLATE II operate at a transmitter frequency of 1090mc and receiver frequency of 1030mc. SLATE I reply codes include any of 33 altitude codes plus an IDENT pulse. SLATE II reply codes include any one of 33 altitude codes in mode c or codes 00 through 77 64 codes, plus the IDENT pulse in mode 3A. Both SLATE modes incorporate additional circuits to provide echo suppression and side lobe suppression. Major problem areas were encountered in the development of an adequate, low-cost altitude transducer, and in the development of the transmitter oscillator. A pressure cell-controlled servo system was adopted as an altitude transducer. An adequate transmitter oscillator was developed using a miniature triode. Other development problems concerning pulse width variation and receiver sensitivity and selectivity were surmount. In conclusion, all specified performance characteristics were met or exceeded. The equipment size could be reduced by using miniature components. The increased cost, however, would offset the weight and space savings incurred.