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FEATURES
APPLICATION
The Hazeltine Decoder Group AN/UPA-59A or B (V) is a flexible IFF system component currently in use with the US Navy and other international navies. The unit selects modes for interrogation and processes replies to provide active and passive decoding and altitude translation of Mark X (SIF) transponder replies.
The AN/UPA-59B is an improved version that facilitates operation with rapidly rotating (60 rpm) antennas and allows operation with the optional light pen. Other improvements are locking mechanical chassis slides for ease of servicing and new or improved electrical features.
DESCRIPTION
The unit, normally mounted adjacent to a PPI or other Primary Radar display indicator, is used to control the IFF/SSR interrogator function and directly display the selected mode reply codes via optional active readout ID-1844A or optional five-channel passive decoder KY-876. The active readout is activated by a range/azimuth gate from the indicator or by the optional light pen. Symbols are forwarded to the PPI display for "Bracket" and/or "Correct" decode for the three-channel basic passive decoder, and five unique graphic symbols with the optional five-channel passive decoder. The basic decoder selects modes for interrogation and will accept video for processing as either mode-separated video, composite video or tagged video. The unit features automatic mode interlace operation which is individually selectable in any combination.
Passive decoding of any code is provided in Modes 1, 2 and 3/A for any condition of interface. The display for "Bracket Decode" or "Correct Code" is an arc at the target position. The arc symbol for "Correct Code" is displayed as stretched in range when the "STRETCH" switch is enabled, differentiating it from the bracket decode symbol.
In the A model, the BKT switch is an ON/OFF type that, when selected, displays the bracket symbol for selected mode replies. In the B model, the BKT switch is an ALL/OFF/ON three-position switch; the added ALL position displays symbols for brackets of all modes interrogated, independent of that particular AN/UPA-59 mode selection.
Improved degarble circuitry reduces loss of valid information,
will suppress the active decoder readout, and may suppress the
passive and emergency decoder when overlapping replies are detected.
A "Selected Altitude Layer" (SAL) feature permits passive
display of Mode C altitude replies, for air traffic control purposes,
from aircraft flying within specific SAL (upper and lower height
settings in multiples of 1000 feet).
Continuous monitoring of emergency replies is also furnished, with selectable threshold circuits, in order to reduce false emergency alarms, detect valid emergency replies, and actuate audio/video alarms.
A separate visuai indicator is provided for each type of emergency reply:
Internal self-test circuits that check passive, active, and emergency decoding functions permit the operator to verify that the equipment is functioning.
OPERATIONAL CHARACTERISTICS
Mode Interrogation Mode
1, 2, 3, 4 and C
Interlace Operation
Multimode 1, 2, 3, 4, C (individually selectable in any combination)
Passive Decoding
Basic: 3 channels: Modes 1, 2 and 3/A; X-pulse decoding; External outputs for expansion to any number of channels; Range adjustment for early decode
Option: 5 channels any mode or code
Active Readout Capability
1 target -4 modes, 2 targets -2 modes, 3 or 4 targets -1 mode
PPI Active Readout Gating
PPI range-azimuth gate; PPI X-Y gate; Light pen
Selected Altitude Layer (SAL)
Aircraft within SAL displayed, upper and lower limits selectable from 0 to 99,000 feet in 1000-foot increments
Degarble Feature
Links to select for bracket and passive decoding; Always provided for active decoding
Radar Video Mix
Selectable radar/lFF mixing with duty cycles to 60%
Tag Video
Tag trigger decoding on Modes 1, 2, 3, 4, and C, and reset decoding
Mode 4 Capability
Mode 4 interrogation control; Video amplification and mode gating to provide video outputs for external processing
Raw Video (Code) Dispiay Delay
0 us, 20.3 us, 40.6 us, 60.9 us (selectable internally)
Emergency Alarms
4X military emergency; 7700 civil emergency; 7600 communications failure; Tone, flashing warning lights, and PPI display, mute/reset; Selectable threshold; Short range inhibit
I/P Decoding
Provides double slash display for decoded l/P replies
Input Video
Operates with separated mode video, composite video (all modes with tags) or tag video (all modes plus separate tag input)
Self-Test Capability
Front panel selected; Any code, any mode; Emergency 4X, 77, 76; Active readout display and PPI display for all decoded test signals
OPTIONS
1. The Active Readout ( Intra-Target Data Indicator) Option ID-1844A provides four-channel active decoding and readout for Modes 1, 2, 3/A and C. The capability is 1 target-4 modes, 2 targets-2 modes and 4 targets-1 mode. Reply codes are read out directly in Modes 1, 2 and 3/A and are translated in Mode C to display altitude in 100-foot increments. The Active Readout is normally installed in the AN/UPA-59 upper slot but may be installed in its own enclosure (see 5 below) CY-7886.
2. The Light Pen Option (available with AN/UPA-59B) allows for active decoding without PPI modification. An operator positions an aiming circle from the pen on the display surface. Targets within the resultant area gate will have their Mode 1, 2, 3 Reply and Mode C altitude displayed on the active readout. The hand-held pen weighs a mere three ounces with power supplied by the AN/UPA-59B.
3. The Five-Channel Passive Decoder Expander Option-KY-876 provides five additional independent mode and code-controlled channels. Mode and code selected by the keyboard are LED-displayed on the front panel. A channel-unique graphic symbol is passed to the indicator upon receipt of selected mode/code reply. This option can be installed as is the active readout in item 1.
4. The Emergency Alarm BX-173 Option provides a remote speaker and duplicate emergency reply indicator.
5. The Case Decoder CY-7886/TPZ-43 Option is the enclosure for either the Active Readout, item 1, or the Passive Decoder Expander, item 3 above.
6. A PPI modification kit is available, when required, to modify
many different PPl's for the active readout function.
PHYSICAL CHARACTERISTICS
| Dimensions / Weight | cm wide | cm high | cm deep | lb |
| Basic & Case | 15.25 | 30.5 | 45.75 | 34 |
| Case Decoder Option | 15.25 | 8.4 | 45 | 3.5 |
| Active/Passive Option | 14.9 | 8.0 | 28.8 | 3.8 |
| Emergency Alarm | 11.9 | 16.8 | 10.2 | 3.1 |
Power Requirements
115 VAC, 47-400 Hz, 70 watts
Environmental Requirements
Altitude
Up to 10,000 feet
Transport
Up to 50,000 feet
Temperature
Operating
0°C to 50°C
Storage
-62°C to +75°C
Vibration0.06 inches amplitude, 5 to 33 Hz
Shock
MIL-S-901 (high impact)
Enclosure
Drip proof per MIL-STD-108
Detailed Equipment Specification
MIL-D-28736A (EC)
General Specification
MIL-E-16400
