DORAC link, began Army- supported work on MUTNS in 1958. The first complete system flight test occurred on January 23, 1961 [194], [195]. RADA: RADA(S) is a general acronym for Random Access Discrete Address (System). Wide-band RADA systems developed prior to 1964 include Motorola's RADEM (Random Access DElta Modulation) and Bendix's CAPRI (Coded Address Private Radio Intercom) system, in addi- tion to RACEP [196]. WICS: Jack Wozencraft, while on duty at the Signal Corps Engineering Laboratory, conceived WICS, Wozencraft's Iterated Coding System (see Figure 2.30). This teletype system was an SR-FH-SS system employing 155 different tones in a 10 kHz band to communicate at fifty words/min. Each bit was represented by two successively transmitted tones generated by either the MARK or the SPACE pseudorandomly driven frequency pro- grammer. Bit decisions were made on detecting at least one of the two trans- mitted frequencies in receiver correlators, and parity checking provided further error correction capability. The subsequent WICS development effort by Melpar in the mid-1950s contemplated its tactical usage as an applique to radios then in inventory [148]. However, just as in ITT's early system concepts, the intended generation of pseudorandom signals via recording [197] did not result in a feasible production design. Melpar Matched Filter System: A more successful mid-1950s development, this MF-SS design was largely conceived by Arthur Kohlenberg, Steve Sussman, David Van Meter, and Tom Cheatham. To transmit a MARK in this teletype system, an impulse is applied to a filter composed of a pseudo- randomly selected, cascaded subset of the several hundred sections of an all- pass lumped-constant linear-phase delay line. The receiver's MARK matched filter is synchronously composed of the remaining sections of the delay line. The same technique was used to transmit SPACE [148] (see Figure 2.31). Patents [198], [199] filed on the system and its clever filter design, the latter invented by Prof. Ernst Guillemin who was a