 |
|||
|
|
|||
|
|
|||
| ||||||||||
|
|  TM 11-5820-518-20
trol to obtain a comfortable audio listening
and 2-2) to T/R, T/R+G, or ADF to select the
level. The audio should remain at a constant
desired type of operation (para 2-2).
level.
c. Turn the mode selector switch to MAN
(9) Depress the microphone push-to-talk
(C-6287/ARC-51BX only, fig. 2-2).
switch to transmit. Speak into the microphone
d. Allow the radio set to warm up for 5
and listen for a sidetone in the headset.
minutes.
b. Preset operation (C-6287/ARC-51BX
2-4.
0perating
Procedures
( 1 ) Turn the mode selector switch to
PRESET CHAN.
a. Transmit-Receive (Main Receiver) O p -
(2) Turn the preset channel control to
eration.
the desired channel, as indicated on the preset
(1) Turn the radio set control 10-mega-
channel indicator.
cycle control until the first two numbets of the
( 3 ) The transmit-receive operation is
desired operating frequency (local uhf sta-
the same as described in a(6), (8), and (9)
tion) appear in the MEGACYCLES indicator
above.
window.
c. Transmit-Receive (Guard Receiver) Op-
Note. During the channel-change cycle, an 800-
eration.
cycles per second (cps) audio tone should be heard in
the headset.
(1) Turn the 10-, 1-, and 0.1-megacycle
(2) Turn the radio set control l-mega-
(on the C-4677/ARC-51X) or 0.05-megacycle
cycle control until the third number of the
(on the C-6287/ARC-51BX) controls to ob-
desired operating frequency appears in the
tain any frequency in the MEGACYCLES in-
MEGACYCLES indicator window.
d i c a t o r window (a(l), (2), and (3) above)
(3) Turn the C-4677/ARG51X 0.l-meg-
greater than 5 mc of the guard channel (243
acycle control (C-6287/ARC-51BX 0.05-meg-
mc).
acycle control) until the decimal point and
(2) Adjust the VOL control for a com-
the fourth number on the C-4677/ARC-51X,
fortable audio listening level.
or the fourth and fifth numbers on the C-6287/
(3) In the C-6287/ARC-51BX, set the
ARC-51BX, of the desired operating frequency
mode selector to the GD XMT position to
appear in the MEGACYCLES indicator win-
tune automatically to the guard channel.
dow.
d. Adf Operation.
Caution: Once a frequency is set, allow
(1) Turn the 10-, 1-, and 0.l-megacycle
at least 12 seconds before changing channels.
(on the C-4677/ARC-51X) or 0.5-megacycle
(on the C-6287/ARC-51BX) controls until the
(4) Set the C-6287/ARC-51BX SQ DIS-
desired operating frequency is indicated in the
ABLE switch to ON.
MEGACYCLES indicator window (a(1), (2),
( 5 ) Turn the C-4677/ARC-51X SENS
and (3) above).
control fully counterclockwise.
(2) Adjust the VOL and SENS controls;
(6) Turn the radio set control VOL con-
listen briefly to identify the station.
trol to the midpoint of its range.
(3) Bearing information is obtained from
(7) Adjust the C-4677/ARC-51X SENS
the adf equipment.
control so that the incoming audio signal is
clear and intelligible.
e. Stopping Procedure. Set the function se-
(8) Adjust the radio set control VOL con-
lect switch to OFF.
Section II. PREFLIGHT (DAILY) OPERATIONAL CHECK
2-5. General
The operational checks should be accomplished
just before flight. The pilot or copilot should
The operational checks given in paragraph 2-6
report any malfunction or failures noted in
supplement the inspection procedures given in
the aircraft operator's condensed checklist.
flight or during the preflight check, in accord-
2-3
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals