HEADQUARTERS OH-58A, Technical Manual

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TM 55-1520-228-10
3-8 Change 11
(3) Function selectors - RETRAN (Both FM
sets).
(4) Receiver switches - Number 1 and number
5 positions as desired for monitoring.
d. Stopping Procedures. Function Selector -
OFF.
3-14. VHF/AM RADIO SET (AN/ARC-115).
3-15. DESCRIPTION – VHF/AM RADIO SET
(AN/ARC-115).
The ARC-115 (figure 3-4) provides two-way VHF ampli-
tude modulated (AM) narrow band voice communica-
tions within the frequency range 116.00 to 149.975 MHz
on 1360 channels for a distance range of approximately
50 miles line of sight. A guard receiver is incorporated
in the set and is fixed tuned to 121.50 MHz. The radio set
is marked VHF AM COMM and is mounted on the left
side of the instrument panel. Antenna installation is
shown in figure 3-1.
3-16. CONTROLS AND FUNCTIONS – VHF/
AM RADIO SET (AN/ARC-115).
Refer to figure 3-4.
3-17. OPERATING PROCEDURES – VHF/
AM RADIO SET (AN/ARC-115).
a. Transmit/Receive.
(1) Function selector - As desired.
(2) Frequency - Select.
(3) RCVR TEST - Press to test.
(4) AUDIO - Adjust.
(5) Transmit.
(a) Transmit-interphone selector - Number
1 or Number 5 position, as desired.
(b) RADIO transmit switch - PRESS.
b. Stopping Procedure. Function Selector - OFF.
3-18. UHF/AM RADIO SET (AN/ARC-116 or
AN/ARC-164).
3-19. DESCRIPTION – UHF/AM RADIO SET
(AN/ARC-116 or AN/ARC-164).
The UHF-AM radio set AN/ARC-116 or AN/ARC-164
(figures 3-5 and 3-6) provides two-way UHF amplitude
modulated (AM) narrow band voice communications
within the frequency range of 225.00 to 399.95 MHz on
3500 channels for a distance of approximately 50 miles
as limited by conditions. A guard receiver is incorpo-
rated in the set and is fixed tuned to 243.00 MHz. Both
receivers are disabled during transmitter operation. The
radio set is marked UHF AM COMM and is mounted in
the bottom center section of the instrument panel. The
UHF radio transmitter and main receiver operate on the
same frequency and are simultaneously tuned by fre-
quency selector knobs on the panel. The set utilizes
position number 2 of the C-6533/ARC intercommunica-
tions control panel. The AN/ARC-164 provides for
twenty preset channels in addition to the manual selec-
tion of channels. Preset selection is accomplished by
positioning the mode switch to PRESET and function
selector to MAIN. Select the desired frequency with the
frequency selector knobs and press the PRESET push-
button located under the access cover upper left portion
of radio.
3-20. CONTROLS AND FUNCTIONS – UHF/
AM RADIO SET (AN/ARC-116 or AN/
ARC-164).
Refer to figures 3-5 and 3-6.
3-21. OPERATING PROCEDURE – UHF/AM
RADIO SET (AN/ARC-116).
NOTE
Determined by radio set serial number
the following channels of the AN/
ARC-116 Radio Set are degraded and
unusable as communication frequen-
cies.
1. 230.20 MHz 11. 320.05
2. 235.15 12. 335.15
3. 243.40 13. 336.80
4. 250.00 14. 350.00
5. 274.65 15. 360.00
6. 286.80 16. 366.20
7. 290.00 17. 370.05
8. 290.30 18. 385.15
9. 300.00 19. 386.80
10. 320.00 20. 390.00
For AN/ARC-116 Radio Set (Serial
Number 137 and subsequent):
1. 274.65 MHz
2. 300.00
3. 366.20