Furuno MARINE VHF RADIOTELEPHONE FM-3000 - Manual (Page 49)

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7.Set Mode
7.2.9 Attenuation level
This item sets the receive attenuation level for the Attenuator
function from 3 levels.
7.2.10 Scrambler code
(Appears only when a scrambler unit is installed)
When an optional scrambler unit is installed, the scrambler
code can be set depending on dealer setting.
When the FM-3030 is installed, 32 codes (1 to 32) can be se-
lected.
7.2.11 Automatic acknowledgement
This item sets the Automatic acknowledgement function ON
or OFF.
When Position Request or Position Report call is received,
transceiver automatically transmits Position Reply or Position
Report Reply, respectively.
Set Mode
AUTO ACK
Auto ACK OFF (default) Auto ACK ON
Set Mode
Scrambler
Code
Scrambler code 1 (default) Scrambler code 32
Set Mode
Attenuation
Level
Attenuation level 1 (default)