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(30 seconds typical). GPS
position can also be transmitted
by using the steps
above plus the Transmit
Position Report steps.
Data Messages The ARC-220 radio set can
store up to 10 transmit and
10 received data messages
up to 500 characters long
each. Received data messages
are stored in memory
and can be retransmitted.
TM 1-1520-240-10
3-2-22
CONTROLS/
INDICATOR
FUNCTION
An advisory alerts when a
data message is received.
Data can be transmitted or
received in any mode (manual,
ALE, or ECCM). Procedure
to send/receive (recall)
messages is the same for all
modes, except in manual
mode when ALE link is not
established.
Data Messages - Received
Received messages are
stored in MSG location 1.
MSG 10 is the oldest message
and is deleted from
memory upon receipt of an
incoming message. Received
messages can be read and/
or forwarded, but not edited.
A CHECK MSG advisor is
displayed when data message
received. To recall data
messages perform the following:
1. Press MSG line-select
switch to view message. If
operator desires to check
messages even though a
CHECK MSG advisory was
nor displayed, press MSG
line–select switch, then
RCVD line-select switch to
view messages. NO MESSAGES
advisory appears if
no messages exists.
2. Use the CURSOR up/
down arrow to view message
one line at a time and left/
right arrows to move cursor
to left margin. Use VALUE
switches to page up or down.
3. To view additional
messages, use CURSOR
switches to position cursor
under the MSG number the
use. VALUE switches to
scroll to next consecutive
message number.
4. To retain messages in
memory, press RTN line-select
switch. Press RTN lineselect
switch to return to operational
CONTROLS/
INDICATOR
FUNCTION
5. To delete messages,
position cursor under message
number to delete, press
the DEL line-select switch
until NO MESSAGES is displayed
mode.
Data Messages -
Transmit
Press SEND line-select
switch to transmit last selected
address in ALE or
ECCM mode, or to transmit
message using current mode
and frequency in manual
mode. In ALE or ECCM
modes advisories are displayed
during tuning, synching
and linking which is done
automatically. SENDING
DATA is displayed while
message is transmitted.
Program/Edit Data
Messages
Press MSG line–select switch
to go to MESSAGE screen,
then press PGRM line-select
switch. NO MESSAGES is
displayed if none exists. Use
the CURSOR up/down arrows
to position the cursor,
then use VALUE switches to
enter desired data (if a previously
programmed message
is to be edited, use
CURSOR an VALUE
switches to obtain appropriate
message and line as described
earlier). To delete a
character in cursor position
and to shift remaining characters
one position to the left,
press DEL line-select switch.
A built-in word dictionary is
available (either default or
filled). To access word dictionary,
press WORD line-select
switch to obtain INSERT
screen. Use CURSOR and
VALUE switches to scroll dictionary.
Place cursor under
desired word and press
SELCT line-select switch to
insert a blank and the selected
word at cursor position
of message edit screen or if
no word found, press CANCL
TM 1-1520-240-10
3-2-23
CONTROLS/
INDICATOR
FUNCTION
line-select switch to return to
edit CONTROLS/screen.
When complete, press RTN
line-select switch to load
message into memory and to
return to top-level screen.
Shutdown Procedures Set
function switch to OFF. Gently
pull and turn function
switch to zeroize.
(ZERO) position to erase preprogrammed
information, including
all fills. Zeroize function
is operational regardless
if system is on or off.
Emergency Communication
The mode used during emergencies
is determined by the
datafill. The equipment operates
normally for mode selected.
Set mode switch to EMER.
Press the PTT switch to
transmit. If in ALE mode, an
ALE call is placed to the selected
address.
Figure 3-2-8. Control/Display Panel, HF Radio Set
(AN/ARC-220)
3-2-25. Voice Security Equipment TSEC/KY-100.
Voice security equipment (TSEC/KY-100), when
installed, provides two-way clear or secure half-duplex
　
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