Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: INTERRO&ATOR SET
TYPE: AN/APX-28( )
24 to 29v ac, 40w
RELATION TO SIMILAR EQUIPMENT
Type of Presentation: L-scope
Number and Interval of Range Markers
Detailed operation of most of the stages in
Undelayed: 10, 50, and 150 mi
Interrogator Set AN/APX-2B are similar to the operation
Delayed: var to 200 mi, expanded to 10
of like stages in Radar Identification Set AN/APX-6. The
and 50 mi
RT-198B/ UPX-7 is identical to the RT unit used in
Duty Cycle: 0.0032
AN/UPX-7. Interrogator Set AN/APX-29A can be used
Channels: 12
by Air Rescue Service as a replacement for AN/APX-28
RF Output Signal (Pulsed-Pairs) Spacing:
equipment.
Mode 1, 3 usec; Mode 2, 5 usec; Mode 3,
8 usec
TECHNICAL DESCRIPTION
Selectivity: 9.5 to 14.5 mc, 6 db down
from max response
Frequency: 950 to 11OO mc
Range Accuracy: plus or minus 0.20 mi
Range, Max: 15O naut mi
Peak Power Output: 1OOOw
INSTALLATION CONSIDERATIONS
Operating Voltages and Power Requirements:
Used on HU-16 and SC-54 aircraft.
115v ac, 380 to 10OO cps, 220w
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENT
QTY
HEIGHT
WIDTH
DEPTH
UNIT WT.
(Inches)
(Inches)
(Inches)
(Pounds)
Receiver-Transmitter
1
14
13
10
36.7
RT-198B/UPX-7
Mounting MT-1439/A
1
2
13
10
3.5
Control C-774A/UPX-7
1
3
6
5
2.0
Range Indicator IP-219/APX
1
8-7/8
8-3/4
16-3/8
21.6
Antenna AS-624/APX
1
Antenna AS-625/APX
1
Antenna Lobe Switch
1
5-1/2
6-1/2
5-11/32
3.5
SA-314/APX
Mounting MT-11B9/U
1
1/2
6
5
1
FT-4O9/U
1
16
9
3
2
REFERENCE DATA AND LITERATURE
Technical Orders:
Specifications:
12P4-2APX28-1
MIL-I-8723
12P4-2APX28-2
MIL-I-25086
12P4-2APX28-3
AN/APX-28( ): 2
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