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as part of the communications mission load information.
A total of 72 channels can be programmed: 20 manual
simplex or half-duplex, 20 programmable simplex or halfduplex,
20 programmable ALE scan lists and 12 programmable
ECCM hop-sets (with ALE capability). Operating
modes of the HF radio set using either simplex or
half-duplex operation are Upper and Lower sideband
(USB, LSB), amplitude modulation equivalent (AME),
and continuous wave (CW). Data may be transmitted or
received in USB or LSB modes. Both standard and advanced
narrow-band digital voice terminal (ANDVT) are
supported. DC power to operate the HF radio set is supplied
by the No. 2 DC bus through the COMM ARC-220
HF circuit breaker on the No. 2 PDP.
3-2-22. Controls and Function, HF Radio Set (AN/
ARC-220). (fig. 3-2-8)
CONTROLS/
INDICATOR
FUNCTION
Cursor (1) Four pushbutton switches
position the cursor verticallyor
horizontally.
Line-Select (3) Pushbutton switches to select
options displayed to left of
each switch.
Brightness (4) Pushbutton switches to vary
display brightness.
Channel/Net Selector
(5)
Seven-position rotary switch
used to select programmed
operating channels or nets.
CONTROLS/
INDICATOR
FUNCTION
Data Connector (6) Interfaces ARC-220 system to
data transfer device for datafill.
Key Connector (7) Interfaces ARC-220 system to
data transfer device for keyfill.
Mode Switch (8) Five position rotary switch selects
mode of operation.
MAN Selects HF conventional communications.
Operating frequency
and emission mode
are selected manually. Selected
information can be
stored in preset channels for
future recall.
PRE Selects conventional HF communications.
Channel/net selector
is used to select preprogrammed
preset channel. Frequency
and emission mode
cannot be changed during preset
operation.
ALE Selects automatic link establishment
mode of operation.
ECCM Selects electronic countercountermeasure
mode of operation.
EMER Used during emergency to
place a distress call. The
mode, frequency, net, etc., is
determined by the datafill.
SQL (9) Two pushbutton switches
which controls squelch and audio
muting.
VOL (10) Eight-position rotary switch
varies the receive audio output
level.
Function Switch
(11)
Five-position rotary switch selects
system operation function.
OFF Turns the ARC-220 off.
STBY Selects the standby function
where built-in test (BIT), setup,
or fill operations can be performed.
SILENT Used in ALE or ALE ECCM
modes to prevent the ARC-220
from automatically responding
to incoming calls.
TM 1-1520-240-10
3-2-17
CONTROLS/
INDICATOR
FUNCTION
T/R Allows the ARC-220 to transmit
and receive in the selected
mode of operation.
ZERO Erases all data (including datafill
and keyfill) which has been
loaded into the system.
Value (12) Two pushbutton switches increments
a field value or single
character value, depending on
cursor position.
3-2-23. Display Lines, HF Radio Set (AN/ARC-220).
The information displayed on each line is dependent
upon the operation being performed. This section specifies
what information can be displayed on each particular
line.
CONTROLS/
INDICATOR
FUNCTION
Line 1 Alpha-numeric display of 15
characters maximum containing
channel title (call sign).
Default value - Mode: channel#
Line 2
ALE Address Alpha-numeric display of 15
characters maximum containing
the Call To (ADRS: xxx)
or Self (SELF: xxx) Addresss.
(ADRS:) and (SELF:) labels
are removed for addresses
greater than 10 characters in
length.
Noise Reduction Character display (ON, OFF)
having a display format of -
NOISE REDUCE: xxx. Default
value is ON.
Fill Type Character display (KEY,
DATA) having a display Format
- TYPE: xxxx x. Default
is DATA.
Contention Control Character display (ON, OFF)
having a display format of -
LBC: xxx. Default is OFF.
CONTROLS/
INDICATOR
FUNCTION
Line 3
Receive Frequency Numeric display (2.0 to
29.9999 MHz) with a display
format of RCV xx.xxxx.
ECCM Station Type Character display (MEMBER,
ALTERNATE, MASTER, NET
ENTRY, ALT NET ENT). Default
is MEMBER.
Lines 3, 4 Character display of emission
mode (USB, LSB, AME, CW)
one space to right of frequency.
Default is USB.
Line 4
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