2-FM SETUP page. The 2-FM SETUP
page allows the operator to set up the VHF-FM
transceiver. On power-up, the transceiver is put into the
self-test mode for approximately 30 seconds. During
this period, the legend TUNING is displayed adjacent to
L1 on the COMM control page and at the top center of
this page and the transceiver will not respond to operator
SC (single channel) mode. The
data at the top center of the page is:
Top line - 2-FM SETUP
Second line - Currently tuned preset
channel, frequency, and plain/cipher indication plus
Third line -
FAIL, EMER, or TUNING if
L1. Successive depressions of L1 will
cause the mode to change from SC to FH to FH/M, with
the active mode boxed.
2 L5. In SC mode, this function is a normal
If the scratchpad is blank, depressing R5 will
change the display of time stored in the transceiver. If
time is not available from the transceiver, the display
remains blank. If valid data is scratchpadded, the data
will be displayed adjacent to L5 and sent to the
Valid time data is day (0 through 99), hours (0
through 23), and minutes (0 through 59). Data fields not
entered are considered zero.
R1. Successive depressions of R1 will
change the squelch from OFF to ON, with the active
4 R2. Successive depressions of R2 will
cause the frequency offset for the selected preset
channel to change from 0 to +5 to +10 to -10 to -5, with
the active offset boxed. The offset selected for a preset
channel is stored with that preset channel.
When the EMER switch on the
keyboard unit (KU) is activated, 40.5
MHz is tuned, squelch is set to ON,
and the function keys on the 2-FM
AM/FM page are disabled.
FH (frequency hopping mode).
This mode is the member versus master/controller 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
channel, the text NET, and the NET number.
Third line - Displays FAIL, EMER, TUNING, or
NO TSEC if appropriate.
The display formats vary somewhat depending
upon whether the aircraft is on the ground or in the air.
1 On the ground.
A L1. Second depressions of L1 will
cause the mode to change from SC to FH to FHIM, with
the active mode boxed.
If a TRANSEC variable has not been
loaded, the text NO TSEC appears on
the third line of text at the top center
of the display.
B L2. The ERF RCV key is used to
initiate reception of frequency hopping data from the
NET controller's radio. The received data is then stored
in the member radio. Depressing L2 causes the legend
to be boxed. If an ERF is received while the ERF RCV
mode is active, the text at L2 will change to STORE
HSET or STORE LSET, followed by the HSET or LSET
data that was received. Depressing L2 will store the
LSET in its channel or the HSET data in the channel
entered in the scratchpad (valid entry is I through 6) and
added to the HSET/LSET list. If the received data is
bad, the text BAD is displayed next to L2. If the
retrieval/storage of data is unsuccessful for some other
reason, the text ERROR is displayed.
c L3. Function key L3 of the 2-FM
SETUP page (FH format) is the HSET TUNE function
key. This function key allows tuning of a hopset while on
the 2-FM SETUP page. Pressing L3 with a valid
channel number (1-6, O or M (O is processed the same
as an M)) that contains a hopset will cause the radio to
be tuned to the entered channel. If a channel number is
entered which does not contain a valid hopset and L3 is
pressed, a scratchpad error. will occur.
The displayed HSET channel is the
one that is used for LATE ENTRY.
d L4. The LSET CH key is used to display
lockset data associated with a particular LSET channel.
If the scratchpad is empty, depressing L4 will cause the
current displayed LSET channel and code to be blanked
from the display. If a valid
LSET channel is