Artifact Details


Printed Circuit Board

Catalog Number



Physical object





Place Manufactured


Identifying Numbers

Model number CM-100-E; CM-559


20 x 17 x 9


Donor note: The CM-100 PCB was manufactured by Lewyt for either the SAGE Random Access PPI (RAPPI) or the FST-1. The FST-1 was the radar data digitizer fpr the SAGE Gap Filler radar. It was designed by Group 24 of the Lincoln Laboratory and commonly known as Slowed Down Video. Each range-azimuth cell number (from 1 to 8199, I believe) represented a target between north marker to north marker. Range accuracy was almost two miles and maximum range was 64 miles; azimuth resolution was 360/256 degrees. there was essentially no memory; as soon as a target was detected a pulse was placed on the telephone line. Its amplitude was half of that of the north pulse which was also put on the line. The pulses were actually sinusoids. This became a primitive MODEM. J. V. Harrington and E. W. Bivans of Lincoln Lab designed the FST-1. Lewyt built the RAPPI and the FST-1/ The RAPPI was designed by Bernard Choen and John Terzian also of Group 24. The CM-100 is a multivibrator circuit which could be configured as a flip-flop or free- running multivibrator (I believe). The CM-559 (the printed circuit in its package) is a multivibrator configured as a 158 microsecond rate gate generator. CM-100-E and the CM-559 (packaged) - see write up with artifacts12/31/87


Component:circuit board module

Lot Number