ECCM operational mode. Available also are a number
of built-in test and status words indicative of internal
conditions within the RT.
Keyboard. The 15-button keyboard is
used to insert or display data, depending on the key
switch actuated, and the positions of the MODE and
function switches. The keyboard is comprised of 10
numerical buttons, three special function buttons, and
two command buttons. The three special function
buttons are located on the right side of the keyboard.
The two command buttons (CLR and ENT) are located
on either side of the numerical zero button. The special
function buttons will always initiate a display according
to the function of the button pressed. Pressing TIME,
will display time, pressing FREQ, will display frequency,
etc. Pressing CLR will clear only the displayed data.
Pressing ENT will enter the displayed data into the
system and is always signaled by a momentary blink of
the display. When the CLR button is pressed, the
displayed digits (two, four or five dependent upon the
displayed information) will have the number replaced by
a horizontal line at the bottom of each digit. This
underline feature aids the operator in knowing where
entered data will appear.
Switches 1 through 9. Digital
inputs are used to key in frequency, load time
information, or offsets. Entry of information is normally
digit-by-digit displayed left to right on the readout. It is
to be noted that operation of the RT is not altered until
complete, valid data is registered on the readout, and
the keyboard ENT button depressed within the seven
second time-out period. Incomplete entries will not be
accepted when ENT is pressed. Acceptance of valid
data is signaled by a momentary blink of the display
when ENT is pressed. Partial or mistaken data may be
erased at any time by pressing CLR, at which time the
last readout will be cleared. Manual frequencies can
only be selected with the function switch in an
operational position and the MODE switch in SC. With
the function switch in LD and the MODE switch in SC,
new preset frequencies may be entered in conjunction
with the numbered positions of the PRESET switch.
With the function switch in LD; TIME may be entered or
altered by pressing TIME, then CLR.
0 (H LD). The 0 (zero) switch is
used to enter zeros in the same manner as defined in
switches I through 9. However, it has a second function;
(H LD) which initiates transfer of ECCM parameters.
CLR. The CLR button is used
to zeroize the display. CLR must be pressed to remove
the old data from the display prior to entering new data
during LD, or changing frequencies during a manual
button is used to initiate entry of all data by keyboard
entry. In all cases, only valid, complete entries will
enable the STO/ENT button. Successful initiation of the
entry action will always be signaled by a blink of the
STO/ENT has a second function of storing a
received hopset or lockout set held in holding memory.
Selection of the preset (I through 6) is necessary.
FREQ. The FREQ button is
used to display the current operating frequency during
single channel (manual or preset) operation. It is also
used in loading preset frequencies, however, the
function switch must be in the LD (load) position.
Whenever the button is pressed, frequency is displayed,
and an entry sequence is initiated involving frequency.
If the frequencies stored within the radio had been
zeroized (ZA on the function switch), FILL and the
preset number will be displayed when FREQ is pressed,
until new valid frequencies are entered. If the operating
frequency currently in use has been offset, the true
operating frequency (plus or minus offset) will be
SEnd/OFST. The SEnd/OFST
(offset) button is used to modify a single channel
operating frequency, manually selected or preset, to
include offsets of 5 or 10 kHz. The offset to be
applied to the basic frequency is displayed by itself in
the two right digits of the display. The function switch
can be in any operational position, however, the MODE
switch must be in SC to apply offsets. Pressing OFST
will immediately display any current valid offset applied
to the selected single channel frequency. Negative
offsets are indicated by a negative sign (-) appearing in
the center digit position. Positive offsets are indicated
by no prefix. No offset is indicated by 00 in the two right
digits. To apply an offset, the OFST button is first
pressed. The CLR button must then be pressed. If a
negative offset is desired, OFST button is first pressed.
A negative sign will appear in the center digit position.
Repeated pressing of OFST will alternate between plus
and minus offsets. The keyboard must now be used to
insert either five or ten. If five is pressed, 05 will
automatically appear. If 10 is required, 1 then 0 must be
pressed. All other