TD-285

TD-285 Gap Filler Multiplexer Set - A Gap Filler Radar Multiplexer set built by Budd Electronics. Used at long-range radar sites to multiplex the long-range radar data with data from up to six short-range gap-filler radar sites and to send the multiplexed result to an FSQ-7 SAGE computer. TD-285 Gap Filler Multiplexer From MIL-HDBK-162A 15 Dec 1965: The Multiplexer is a link in the transmission of data from both long-range radar and gap-filler radar sites to the SAGE System Central Computer. The Multiplexer receives any combination of inputs, up to six, from the FST-1 or FPS-14, and FPS-18 Gap Filler radars. The gap filler outputs are interleaved with the output of a long-range radar site. The information is then transmitted over a single pair of telephone wires. Signals from the AN/FST-2 control the reading out and transmission of the store information. Permission to transmit is alternated between the stored gap filler data and long-range radar output. This permits the use of only one pair of telephone lines instead of seven. Multiplexer operation can be remotely controlled from a distance up to 150 feet. TD-285 Gap Filler Multiplexer TD-285 Gap Filler Multiplexer Element Value Notes Nomenclature TD-285 Manufacturer Budd Electronics Type Multiplexer Data Capacity 50 Targets/Sec Max Input Data Rate 1300 & 1699 bits/sec Azimuth Capacity 10 bits Range Capacity 7 bits Transmission Rate 20,000 bits/sec Storage Capacity 640 bits 32 words Input Channels 6 Input Bandwidth 15 kc Input Freq Range 500 to 15.5 kc Output Bandwidth 100 kc Input Voltage 117 Vac, 1 ph, 60 cycles Input Current 7 Amps Max Input Power 800 W Max TD-285 Components (edit list) Component Model Quantity Height Width Deep Weight Notes Remote Box 1 14 19 8.5 25 Console 1 81.5 73.25 36.25 1,100 See Also: US Multiplexer Sets Sources: Winkler, David F., Searching the Skies: the Legacy of the United States Cold War Defense Radar Program, USAF Hq Air Combat Command, 1997, 192 pages, Pdf MIL-HDBK-162A, 15 Dec 1965. Links: