FST-2

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FST-2 - A Radar Data Coordinate Data Transmitter (CDT) built by Burroughs Corporation at their Paoli facility outside Philadelphia for use in the SAGE System. The FST-2 took the analog radar data, processed and digitized it and created digital target words that were transmitted to the SAGE Direction Center.

A total of 134 FST-2 CDTs were installed at SAGE System radar sites and training facilities during the late 1950s and early 1960s. Two complete sets were located in Building 2901 at Keesler Tech Training Center in Biloxi, Mississippi, where training courses were conducted. The surviving FST-2s were replaced circa 1972 with Common Digitizers, FYQ-47, and FYQ-49s. The initial 18-month FYQ-47/49 USAF/FAA replacement program was completed in February of 1973.

FST-2 Radar Data Coordinate Data Transmitter

The FST-2 was a very large duplex digital system using vacuum tube technology. Over 6900 vacuum tubes were used in each FST-2 requiring 21 air conditioned cabinets, 40 tons of airconditioning, 43.5 kva of prime power and usually a large new addition to the operations building. The FST-2B modification added two more cabinets but with newer solid state (transistor) technology to process coded responses from aircraft transponders (IFF/SIF).

The FST-2 used a magnetic drum synchronized with the radar set to store target "Hits" when sufficient hits were recorded a target message was created and sent to the direction center over voice grade 4-wire telephone circuits. Once a target was identified, the direction center could return a request for height information and slew the radar site height-finder to the correct azimuth where an operator would identify the target and transmit the target altitude to the direction center.

FST-2 Radar Data Coordinate Data Transmitter
Element Value Notes
Nomenclature FST-2
Variants FST-2A
FST-2B
Manufacturer Burroughs Corporation
Type Radar Data Processor
Inputs Radar Video
Beacon Video
SAH/F Requests
From Radar receivers
From Beacon receiver
From SAGE DC
Outputs 1300 bps Target Messages To SAGE DC
Number Made 134
Introduced 1959
Stock Number 5895-583-1140
5895-678-2621
FST-2A
FST-2B
FST-2B Aboard Texas Tower II circa 1961. Picture shows the solid state SIFF Cabinet opened for troubleshooting using a Tektronic 545 Oscilloscope and the Lewyt RO-65 Data Recorder
Sketch of OA-1163/FST Coordinate Data Monitor and RO-65/FST Data Recorder
Typical FST-2 Installation Plan



FST-2 Major Components (edit list)
Item Component Model Quantity Height Width Deep Weight Notes
1 Interconnecting Box J-797/FST-2 1
2 Decoder-Generator Group OA-2147/FST-2A 2
2 Decoder-Power Supply Group OA-2444/FST-2B 2
3 Quantizer Group OA-2149/FST-2A 2
3 Quantizer-Synchronizer Group OA-2329/FST-2B 2
4 Coordinate Data Storage Group OA-2148/FST-2A
OA-2328/FST-2B
2
2
5 Magnetic Drum Storage Amplifier AM-210?/FST-2A
AM-2218/FST-2B
2
2
6 Coordinate Data Monitor IP-366/FST-2
IP-498/FST-2
2
7 Data Processing Group OA-2150/FST-2A
OA-2327/FST-2B
2
2
8 Power-Signal Transfer Cabinet SA-621/FST-2A
SA-672/FST-2B
1
1
9 Data Processing Cabinet MX-2668/FST-2A
MX-2753/FST-2B
2
2
10 Power Supply Assembly PP-2210/FST-2
PP-2340/FST-2B
2
2
11 Converter-Shift Register Group OA-2051/FST-2A
OA-2326/FST-2B
2
2
12 Power Control-Regulating Cabinet C-2753/FST-2A
C-3005/FST-2B
2
2
13 Electronic Counter-Shift Register CP-117/FST-2A
CP-192/FST-2B
2
2
14 Data Processing Automatic
Clutter Mapper Cabinet
 ????/FST-2A 2
15 Interconnecting Box J-798/FST-2 2
16 Target Position Indicator IP-370/FST-2 4
17 Motor-Generator Control C-1979/FST-2 4
18 Motor-Generator PU-367/FST-2 2
19 Message Console OA-2140/FST-2 4
21 Message Console Panel PT-443/FST-2 4
24 Moving Target Indicator Group OA-1638/FST-2 2
Control-Indicator C-2969/FST-2 1
Indicator-Amplifier G-2843/FST-2A 1

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