Volume 1
MIL-HDBK-162A
Section 2
15 December 1965
ITEM NAME: RADIO SET
TYPE: AN/APN-4
Signal to Noise Ratio: 5.1
RELATION TO SIMILAR EQUIPMENT
INSTALLATION CONSIDERATIONS
Used in conjunction with a ground system to provide an
Related Equipment: (Required but not
overall Loran system.
supplied) (3) Radio Frequency Cables
RG-7/U, (3) Pen Wire No. 16 Airplane
TECHNICAL DESCRIPTION
Cable AN-J-C-.18, (1) Radio Frequency
Cable RG-u/U, (1) Antenna Switch SA-
Frequency Range: 1.6 to 3.3 mc in 2
13/U or SW-225, (7) Cable Clamps M-297
channels, 7.58 to 11.75 in 2 channels
or M-297-A, (1) Cordage CO-239-A, -C,
except for Radio Receiver R-9B/APN
or -D, (1) RF Cable Coupling MC-277 or
which has a freq range of 1.7 to 2.5
MC-277-A, (6) RF Cable Couplings
Quantity of Preset Frequencies Possible: I
MC-320 or MC-320-A, (1) Plug PL.-167,
Receiver Sensitivity: 4 to 5 uv and 10 to
(2) Plugs PL-QI71 and (2) Ferrules.
15 uv
Receiver Selectivity: 6 db down from max
response
PRINCIPAL COMPONENTS AND PHYSICAL DATA
COMPONENTS
QTY
OVERALL DIMENSIONS
UNIT WT.
(Inches)
(Pounds)
Radio Receiver R-9/APN-4
1
7.87 x 9 x 19.5
25,.15
Mounting FT-447-A or
1
2.5 x 8.6 x 19.5
2.3
MT-203/APN-4 or
Radio Receiver R-9A/APN-4
1
7.87 x 9 x 19.5
25.45
Mounting FT-,147-A or
1
2.5 x 8.6 x 19.5
2.3
MT-203/APN-,I or
Radio Receiver R-9B/APN-4
1
7.B7 x 9 x 19.5
25.,13
Mounting FT-447-A or
1
2.5 x 11.6 x 19.5
2.3
MT-203/APN-4
Indicator ID-6,/APN-4
1
9 x 11.75 x 19.5
35.2
Mounting FT-4-16 or
1
2.5 x B.6 x 19.5
2.3
Indicator ID-6A/APN-,I or
1
9 x 11.75 x 19.5
35.2
Indicator ID-6B/APN-4
1
9 x 11.75 x 19.5
35.2
Mounting FT-.166 or FT-446-A
1
2.5 x 1.6 x 19.5
2.3
NOTE: Only one Indicator and one receiver are
furnished as components of one Radio Set
AN/APN-I, however, any receiver may b
installed with any indicator.
REFERENCE DATA AND LITERATURE
Technical Manuals:
TO16-30APN-4-3
AN/APN-4: 2
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