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'''{{PAGENAME}} 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.

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From MIL-HDBK-162A 15 Dec 1965: <blockquote>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.</blockquote>
== TD-285 Gap Filler Multiplexer ==
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|+ TD-285 Gap Filler Multiplexer
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! Element
! Value
! Notes
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| Nomenclature || TD-285 ||
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| Manufacturer || Budd Electronics ||
|-
| Type || Multiplexer ||
|-
| Data Capacity||  50 Targets/Sec Max||
|-
| Input Data Rate || 1300 & 1699 bits/sec||
|-
| Azimuth Capacity || 10 bits||
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| 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 ||
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| Input Power || 800 W Max ||
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{{TD-285Components}}

'''See Also:'''
* [[US Multiplexer Sets]]

'''Sources:''' 
* {{Winkler}}
* MIL-HDBK-162A, 15 Dec 1965.

'''Links:''' 

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[[Category:Multiplexer Sets]]