A study of the JPL Mark I ranging subsystem
Mark 1 ranging subsystem special purpose version of MOD II ranging equipment used in Deep Space Instrumentation Facility /DSIF/
DISTANCE MEASURING EQUIPMENT↗
Engineering topics
Spafford, M. L.
Publications and source records attributed to Spafford, M. L..
Simple BCD circuit accurately counts to 24
Ripple-through counter with divide-by-24 output pulse is used in digital control clocks to register hours and give a daily output signal. It uses commercially available digital modules that incorporate and/gates with flip-flops.
Spafford, M. L.↗