Volume 1
MIL-HDBK-162A
Section 3
15 December 1965
ITEM NAME: DECODER GROUP
TYPE: AN/UPA-24A
Radar Video Input
RELATION TO SIMILAR EQUIPMENT
Source: Associated radar set
None.
Pulse Polarity: Pos going
Amplitude: 2.0 plus or minus 0.5v max
TECHNICAL DESCRIPTION
Pulse Width: 0.30 to 1500 usec
Video Input and Output Impedances: 75
Duty Cycle During Signal Time: 0.0 to
ohms
60.0% (at .100 pulse repetition freq)
IFF Video Pulse Train Input
Noise: 2.0v max and up to 60% duty cyc
Source: Radar Recognition Set
Acceptable Signal Time Duration: 20.0
Number of Pulses in Train
to 5000 usec
Mode 1: 2 to 7
Repetition Rate: 10.0 to 5000 pps
Mode 2: 2 to 14
Decode Video Output Pulse
Mode 3: 2 to 8
Destination: Radar indicator of
Spacing (Pulse Trains with 6 Information
associated radar
Pulses): First information pulse 2.90
Pulse Duration: 0.30 to 1.0 usec
plus or minus 0.05 usec from start
(0.45 usec nom)
pulse, succeeding pulses 2.90 plus or
Pulse Rise Time: 0.08 to 0.20 usec
minus 0.05 usec apart
Pulse Decay Time: 0.05 to 0.30 usec
Spacing (Pulse Trains with 12 Informa-
Pulse Amplitude: 2 plus 0.5v nom
tion Pulses): First information pulse
Primary Power Requirements: 115v plus or
1.45 plus or minus 0.05 usec from
minus 10%, 60 or 400 cyc, 1-ph, 60w
start pulse, succeeding pulses 1.45
Heater Power Requirements: 115v ac or
plus or minus 0.05 usec apart
dc, or 230v ac or dc, 20w
Pulse Input Polarity: Pos
Heat Dissipation: 60w total
Allowable Undershoot: Less than 5%
Ambient Operating Temperature
Pulse Train Duration: 20.3 plus or
Operating: -28 to plus 65C (-18.4 to
minus 0.1 usec
plus 149F)
Pulse Amplitude: 2.0 plus or minus 0.5v
Non-Operating: -62 to plus 75C
Individual Pulse Duration: 0.30 to 1.0
(-79.2 to plus 167F)
usec (0.45 nom)
Pulse Rise Time: 0.08 to 0.20 usec
Pulse Decay Time: 0.08 to 0.30 usec
INSTALLATION CONSIDERATIONS
Amplitude Variation Between All Pulses:
Related Equipment
plus or minus 1.0 db max
Required but not Supplied: (1) Cable
Duty Cycle: 25% max (signal plus noise)
MSCA-14; (4) Cable MSCA-19; (2) Cable
Noise Only: 2v max and up to 20% max
DSGA-3; (5) Cable RG-12/U.
duty cyc
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENTS
QTY
OVERALL DIMENSIONS
UNIT WT.
(Inches)
(Pounds)
Decoder, Video KY-291/UPA-24A
1
9 x 9-3/4 x 17-1/2
24.75
Control, Video Decoder
1
5-1/,1 x 5-13/16 x 9
5.25
C-2901/UPA-24A
Case, Video Decoder
1
5-13/16 x 7-3/16 x 9
7.25
CY-2628/UPA-24A
Technical Manual NAVSHIPS
2
1/2 x 8-1-1/2 x 11
1.0
93876(A)
Operating Instruction Chart
1
8-1/2 x 11
NAVSHIPS 93876.21
AN/UPA-24A: 2
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