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— press. Check that SEL lamp is lit.
(4) Homing procedures. The course deviation
bar on the HSI provides the primary navigation indication
when the set is in homing mode. The bar only provides
information on whether the helicopter is left, right, on
heading to a signal source, or over the signal source. The
TO-FROM ambiguity arrows will not function and selective
source feature is not available. Ambiguity is solved
using either of the following methods:
(a) Directional method. When the helicopter
is heading inbound to the signal source with the bar
centered, the indications are directional in that a change
in heading to the right will cause the bar to drift to the left.
Conversely, a change in heading to the left will cause the
bar to drift to the right. When the helicopter is heading
outbound from the signal source with the vertical pointer
centered, the indications are nondirectional in terms of
steering. A change in heading to the right will cause the
bar to drift to the right. A change in heading to the left will
cause the bar to drift to the left.
(b) Build and fade method. If the signal
source is transmitting a 150-Hz tone-modulated signal
and the helicopter is inbound to the signal source, the
tone will increase in intensity. The tone will decrease in
intensity on an outbound heading.
(5) Additional homing characteristics. The following
additional characteristics may be observed when
homing. The glideslope deviation pointer will rise from
the horizontal mark when the aircraft is inbound (increasing
signal strength) to a transmitter. The pointer will fall
to the horizontal mark when outbound. The glidescope
failure and navigation failure warning flags will be in view
if there is inadequate homing signal strength. A dip in the
horizontal pointer may or may not occur when passing
over the station, depending on the signal source, helicopter
speed, and altitude.
3-2-17. Controls and Functions VHF/FM Radio
Set. (fig.3-2-6)
CONTROLS/
INDICATOR
FUNCTION
Function Selector
OFF Primary power OFF. Memory
battery power ON.
TEST RT and ECCM modules are
tested. Results; GOOD or
FAIL.
SQ ON RT on with squelch.
SQ OFF RT with no squelch.
RXMT RT in RECEIVE mode. Used
as a radio relay link.
LD Keyboard loading of preset frequencies.
LD-V TRANSEC variable loading is
enabled.
Z-A Not an operational position.
Used to clear the TRANSEC
variable.
STOW All power removed. Used during
extended storage.
Mode Selector
HOM Homing antennas are active;
communication antenna is disconnected.
Provides pilot
steering, station approach, and
signal strength indicators.
SC Single channel mode of operation.
Operating frequency selected
by PRESET selector
keyboard entry.
FH Frequency hopping mode selected.
PRESET selector positions
1-6 select frequency hopping
net parameters.
FM-M Frequency hopping-master
position selects control station
as the time standard for communicating
equipment.
Preset Selector
MAN Used in a single mode to select
any operating frequency in
25 kHz increments.
TM 1-1520-240-10
3-2-13
CONTROLS/
INDICATOR
FUNCTION
POS. 1-6 In single channel mode, preset
frequencies are selected or
loaded. In FH or FM-M mode,
frequency hopping nets are selected.
CUE Used by a non-ECCM radio to
signal to CUE or ECCM radio.
IFM RF Selector
OFF (Bypass) - 10 watts
LO (Low Power) -2.5 watts
NORM (Normal) -10 watts
HI (High power) - 40 watts
Display The display generally operates
in conjunction with the keyboard.
Other displays may be
selected by the FUNCTION
and MODE selectors.
Keyboard A 15- button array of switches
in a 4 x 4 matrix, used to insert
data or select data for display.
The keyboard is comprised of
10 numerical buttons, three
special functions, and two
command buttons.
Switches 1 - 9 Used to key in frequencies,
load time information, or offsets.
CLR Used to zeroize the display or
to clear erroneous entries.
0 (H-LD) Used to enter zeroes. Second
function (hold) initiates transfer
of ECCM parameters.
STO/ENT Initiate entry of all data by keyboard
entry. Its second function
is to store a received Hopset
or Lockout Set held in holding.
FREQ Display the current operating
frequency during single channel
(manual or preset) operation.
CONTROLS/
INDICATOR
FUNCTION
SEND/OFST Modify a single channel operating
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