Abstract: A cage to retain an undersea vehicle therein and tether reel-in and play-out mechanism is provided. The cage includes a latch for retaining the vehicle in a "garage" portion. A tether drive assembly reels in and out the tether line through a bale which cooperates with a narrow, annular drum to retain the tether line in an annular, cylindrical coil having a width of a single strand of line. The bail, with or without cooperation from additional means, winds and unwinds the tether in the drum.
Abstract: The data selection circuit includes a multiplexer circuit which receives a plurality of inputs and individually connects each of the inputs to an output line. The multiplexer is sequenced by signals from a timing circuit which causes inputs having a higher signal level to be connected to the multiplexer output for a greater length of time. The data selection circuit is particularly suitable for enhancing the image on a CRT of a continuous tone frequency modulated sonar system.