Chris - I have 2 of the HAL ID-1A units that I picked up surplus from a Western NY utility company last year. They used these 2 units on their older repeater systems (circa 1970s) -- and one unit -- was converted fro 120 VAC to 12 VDC.
YES, they are diode matrix programmed (for ID) -- which was state of the art (user friendly, not requiring programmer or skills) in that era (1970s). The Icom IC-22S was a 2-meter radio that also used this approach for channel programming! I called Mr. Henry, who is president of HAL (and late 1950s EE grad for University of Illinois) and purchased the manual directly for HAL Communications (great printing) -- about $25 with shipping. Provides the theory of operation, function descriptions for interfacing and matrix grid programming You program the DOT, DASH and SPACE between characters HAL Communicaitons 1201 West Kenyon Road Urbana, IL 61801-1033 Telephone: (217) 367-7373
