The legend TSEC STORE at R2 is displayed
only if the TSEC variable is stored in holding
If a TSEC variable is successfully stored into
permanent memory, the text NO TSEC will be
removed from the display.
R5. R5 is used to store hopsets
and locksets from a fill device into the transceiver. When
depressed, the legend at R5 will be boxed and will load
the HSET or LSET channel entered into the scratchpad
with the data from the fill device. Valid HSET entries are
1 through 6 or H1 through H6. Valid LSET entries are L1
through L6 or the single character L. ERROR or BAD can
be displayed for unsuccessful or bad fill attempts.
2 In the air. The legend at R4 and R5 will
be blanked in the air because the TSEC FILL and FILL
function is only available when the aircraft is on the
(c) FH/M (frequency hopping - master mode).
This mode is the master/controller versus the member
mode of the frequency hopping mode of the VHF-FM
transceiver. The data at the top center of the page is:
Top line - 2-FM SETUP.
Second line - the currently selected FH channel; and
the text NET and the net number.
Third line - CONTROL or CONTROL/NO TSEC, but
can read FAIL, EMER, or TUNING if appropriate. The
display formats vary somewhat depending upon whether
the aircraft is on the ground or in the air.
1 On the ground.
L1. Successive depressions of L1
will cause the mode to change from SC to FH to FH/M,
with the active mode boxed.
The differences between the FH/M and FH mode dis-
play formats are:.
FH/M mode - L2 allows the operator to send (versus
receive) frequency hopping data.
R1 (LATE NET) - Blanked.
If a TRANSEC variable has not been loaded, the
text NO TSEC will appear on the third line of text
at the top center of the display.
L2. The ERF SEND key is used to
initiate transmission of frequency hopping data from the
NET controllers radio. When data is in the scratchpad
and L2 is depressed, the text SENDING HSET CH X or
SENDING LSET CH X (where X is the HSET or LSET
channel in the scratchpad) is displayed. Valid scratchpad
data is 1 through 6, H1 through H6, or L1 through L8. The
sending legend is displayed for 12 seconds or until the
radio has finished sending.
2 In the air. The on-ground and in-air dis-
play formats for the FH/M mode are the same except that
the legends TSEC FILL (R4) and FILL (R5) keys are
blanked (these functions are not available in flight).
c. FM FREQ List Page. The FM frequency list page
is accessed by depressing R4 on the COMM control
page when FM FREQ is displayed at R4. This page is
used to enter/delete preset frequencies and hopsets/
locksets for the VHF-FM transceiver. On power-up, all
the data displayed in the frequency list box (right side of
the display) at shutdown is recalled, and the hopset/lock-
set information stored in the radio is recalled and dis-
played in the hopset/lockset box (left side of the display).
Leading zeroes and zeroes in the hundredths and thou-
sandths position are not displayed.
(1) EDIT HSET. This key allows the net controller
to change/create hopsets. Scratchpadding valid data
and depressing L1 will cause the legend at L1 to be
boxed. When the scratchpadded data has successfully
been entered into the hopset list, the box around the
legend at L1 will be removed.
If the HSET EDIT is unsuccessful, the text ER-
ROR will temporarily replace the channel identi-
fier until another bezel switch is depressed.
Valid data consists of a valid hopset (HSET) channel
(0 through 6 or an M) followed by a valid HSET code (2
digit numbers from 0 through 99 or 3 digit numbers with
the first digit being the same as the first digit of the hopset
code in the currently selected channel), and/or a valid
plain/cipher command (a P or a space or C plus a 1
through 6) and/or a valid identifier (1 through 6 alphanu-
meric characters, beginning with an alpha but excluding
E, C, C plus 1 through 6, and P).
(2) DEL HSET. This key provides a means for de-
L2 will cause the legend at L2 to be boxed and the hopset,