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a. MWOD Loading.
(1) Perform paragraph 3-2-11 Starting steps
a(1) and a (2).
TM 1-1520-240-10
3-2-8
(2) Channel selector switch — Set to 20.
(3) Frequency mode selector switch — PRESET.
(4) Frequency mode selector switch — Set
220.025 MHz.
(5) PRESET switch — Press. Radio is now programmed
to accept MWOD.
(6) Frequency mode selector switch — MANUAL.
(7) Frequency selector switches — Enter first
WOD segment.
(8) TONE switch — Press. First WOD segment
is now loaded to the nonvolatile memory of the radio —
Listen for BEEP.
(9) Channel selector switch — Set to 19.
(10) Frequency selector switches — Enter second
WOD segment.
(11) TONE switch — Press.
(12) The remaining four WODs can be loaded in
a similar fashion by dialing the next lower preset channel,
selecting the next WOD segment. After entering last segment,
listen for a double (3125 Hz) beep.
(13) Channel selector switch — Set to 14.
(14) Frequency selector switches — Enter date
code.
(15) TONE switch — Press. At this time, one
complete WOD with its corresponding date code has
been entered to the nonvolatile memory.
(16) Additional WODs can be loaded by repeating
steps (5) through (15). Once WODs have been entered,
today’s operational date must then be entered.
(17) Channel selector switch — Set to 1.
(18) Frequency selector switches — Enter operational
date.
(19) TONE switch — Press.
b. Operate/Verify Modes.
(1) Operate Mode.
(a) Frequency mode selector switch —
PRESET.
(b) Channel selector switch — Set to 20.
(c) Frequency selector switches — Enter
220.000 MHz.
(d) PRESET switch — Press. Radio set is
now programmed to operate in either normal mode or
anti-jam mode.
(2) Verify Mode.
NOTE
This verification test only checks for presence
of a WOD with the corresponding date code.
It does not check for the authenticity of the
WOD segments entered.
(a) Channel selector switch — Set to 20.
(b) Frequency mode selector switch —
MANUAL.
(c) Frequency selector switches — Enter
date code to be verified.
NOTE
If a single beep is not present for a particular
date code and the anti-jam mode is entered
using that date, a constant warning tone will
be heard signifying that the anti-jam mode
initialization cannot be properly completed.
(d) Channel selector switch — Set to 19,
then back to 20. A single beep will be heard if WOD with
the date code in step (c) is present.
c. Erase Mode.
(1) Channel selector switch — Set to 20.
(2) Frequency mode selector switch —
PRESET.
(3) Frequency selector switches — Enter
220.050 MHz.
(4) PRESET switch — Press.
(5) Frequency mode selector switch —
MANUAL.
(6) TONE switch — Press. All MWODs are
now erased.
d. Training Frequency Load.
(1) Channel selector switch — Set to 20.
(2) Frequency mode selector switch —
PRESET.
(3) Frequency selector switches — Enter
220.075 MHz
(4) PRESET switch — Press.
(5) Frequency mode selector switch —
MANUAL.
(6) Frequency selector switches — Enter
desired training frequency.
(7) TONE switch — Press. A single beep
will be heard.
(8) The next frequency is loaded by entering
the next lower preset channel, selecting the next
training frequency, and pressing the TONE switch. Up to
16 training frequencies may be entered. Following this
procedure.
TM 1-1520-240-10
3-2-9
e. TOD.
(1) TOD Receive/Update.
NOTE
The first TOD message received within one
minute of selecting T on the hundreds frequency
selector switch will be accepted.
When communications are slightly garbled
but otherwise acceptable during AJ operations,
this is an indication of drift in TOD synchronization.
A TOD update should be performed.
(a) Frequency selector switches or channel
selector switch — Set to predetermined TOD frequency.
(b) Hundreds frequency selector switch —
Momentarily select T, then release. A momentary 1667
Hz tone will be heard while receiving the TOD message.
NOTE
The following step is not necessary if TOD
message is being transmitted continuously
on the predetermined TOD frequency; for example,
continuous TOD message is being
transmitted from a satellite.
(c) Request TOD from another station within
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