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Transmit Frequency Numeric display (2.0 to
29.999 MHz) with format of
XMT xx.xxxx.
Time Numeric display (00:00:00 to
23:59:59) with a format of -
Hour:Minute:Second.
Line 5
Link Protection Character display (OFF, ON)
with a format of - LINK
PROT: xxx. Default is ON
(OFF if no link protection datafill.
Date Alphanumeric display (01
JAN 00 to 31 DEC 99) with
format of - dd MM yy.
Antenna Type Character display (T/R, RCV)
with format of - ANT: x xx.
Default is T/r.
Line 6
Power Level Character display (LOW,
MED, HIGH) with format of -
PWR: xxxx. Default is HIGH.
Squelch Alpha-numeric display
(TONE, 0 to 5) with format of
- SQ: xxx.
Volume Numeric display (1 to 8) with
format of - VOL: x.
Listen Before Talk Character display (ON, OFF)
with format of - LBT: xxx. Default
value is OFF.
TM 1-1520-240-10
3-2-18
3-2-24. Operating Modes/Functions, HF Radio Set
(AN/ARC-220). (fig. 3-2-8)
CONTROLS/
INDICATOR
FUNCTION
Power ON/OFF On function Switch.
CRT Brightness Two pushbuttons switches
used to vary brightness. The
↑ (up arrow) increases intensity
while the ↓ (down arrow)
decreases intensity.
System Turn-On Turning the Function Switch
clock-wise from OFF to
STBY turns system on and
selects standby function.
SYSTEM TESTING is displayed
while power-up BIT
(P-BIT) is in process. SYSTEM
-GO will be displayed if
all tests good, SYSTEMNOGO
if not.
Audio Volume Eight-position rotary switch
varies output level. Setting is
displayed on line 6 (bottom)
of display for 5 seconds
when system first turned on
or when VOL setting is changed.
The display level are 1,
2, 3 thru 8.
Channel Selection Channel number may be
changed using the Channel
Selector seven-position
rotary switch. The + position
of the greater to be selected
using the VALUE switch.
Modulation Mode Four modes are available:
USB, LSB, AME, and CW. To
change modes, depress the
EDIT line select switch.
While in the Edit screen use
the CURSOR switches to
position cursor under the appropriate
emission mode
(RCV or XMT). Use the VALUE
switches to change
mode. (Note: The XMT mode
will automatically change with
RCV mode, but the reverse is
not true). Depress RTN line
select switch to enter the
edited data and return to operational
mode.
CONTROLS/
INDICATOR
FUNCTION
Receive/Transmit
Frequency
2.0 - 29.9999 MHz, programmable
in 100 HZ steps. To
change frequencies, depress
the EDIT line select switch.
While in the Edit screen use
the Cursor switches to position
cursor under the appropriate
frequency. Use the
VALUE switches to change
frequency. (Note: The XMT
frequency will automatically
change with the RCV frequency,
but the reverse is not
true).
Squelch Level/ Audio
Muting
Two pushbutton switches
-SQL +, when pressed displays
the squelch status on
line 6 of display for 5 seconds.
Settings are TONE
and 0 through 5. TONE provides
no muting and no
squelch. Position 0 provides
muting but no squelch. Positions
1 through 5 provide
muting and increasing levels
of squelch. Muting is normally
enabled during ALE and
ALE ECCM operation.
Output Power Level Three output levels are selectable
for the display
screen by using the EDIT
line-select switch, which
brings up the edit mode,
moving the cursor under the
power character field and using
the VALUE switches to
change the field. Depress the
RTN line-select switch which
stores the change and returns
to normal operating
mode. There are two Built-in-
Test (BIT) features which
concerns the operator, P-BIT
and C-BIT. The Power-UP Bit
(P-BIT) test the ARC-220
when initially turned on. P-Bit
exercise basic radio control
functions which must be operational
prior to entering a
system operational mode. A
GO/NO/-GO status appears
on the display and defaults to
standby mode upon completion.
When NO-GO status appears,
depressing the
TM 1-1520-240-10
3-2-19
CONTROLS/
INDICATOR
FUNCTION
INOP line-select switch displays
INOP MODES so an
operator can see if limited capability
exists. The Continuous
Bit (C-BIT) is automatically
performed during system
operation without any
operator intervention. Critical
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