TM 1-1520-238-10
3-28
channel in single-channel operation or as a special signal-
ing frequency in the FH modes.
1. FUNCTION switch – LD.
2. PRESET switch – Number 1 through 6, as de-
sired.
3. MODE switch – SC.
4. FREQ button – Press. Frequency is displayed.
5. CLR button – Press. Display shows all bottom
dashes.
6. Keyboard – Enter 5 digits for frequency.
7. Sto ENT button – Press. Display blinks momen-
tarily.
8. Repeat steps 1 through 7 for each desired pre-
set channel.
c. Setting a Frequency Offset (Non-ECCM Mode
Only).
NOTE
Frequency offset tuning is provided for
transmitting and receiving in the non-ECCM
mode only.
A single channel operating frequency, either manually se-
lected or preset, can be offset by +10 kHz, + 5 kHz, –5
kHz, or –10 kHz. The offsets are shown in the two right
hand digits of the display.
1. MODE switch – SC.
NOTE
Negative offsets are indicated on the display
by a negative sign (–) appearing in the cen-
ter digit position. Positive offsets are indi-
cated by no prefix. No offset is indicated by
00 in the two right side digits of the display.
2. SEnd OFST button – Press. Any current valid
offset applied to the selected single channel fre-
quency will be displayed.
3. CLR button – Press. Display shows all bottom
dashes.
NOTE
Repeated pressing of SEnd OFST button
will alternate between plus and minus off-
sets.
4. SEnd OFST button – Press if a negative offset is
desired. A negative sign (–) will appear in the
center digit position.
5. Keyboard – Enter 5 or 1 and 0. The display indi-
cates 05 or 10.
6. When a valid offset is shown on the display,
along with a minus or plus (no indication) sign,
press Sto ENT button within 7 seconds of key-
board entry. Display momentarily blinks.
7. FREQ button – Press. The original operating fre-
quency with the offset added or subtracted will
be displayed.
8. To cancel an offset:
a. SEnd OFST button – Press. Existing offset
will be displayed.
b. CLR button – Press. Display shows all bot-
tom dashes.
c. HoLD button – Press. 00 is displayed.
d. Sto ENT button – Press. Operating frequen-
cy is returned to its non-offset condition.
d. Setting Frequency Hopping.
1. MODE switch – FH or FH-M, depending on radio
set which is to be the master station.
2. PRESET switch – Select frequency hopping net
parameters 1 through 6, as desired.
3. FUNCTION switch – SQ ON or SQ OFF, as de-
sired.
e. Setting Time for Frequency Hopping.
1. FUNCTION switch – LD.
