8.3 T/A, TEST, RESET DSP
8-8
8.3 T/A, TEST, RESET DSP
Call up the option menu with reference to page 4-1. Select [MENU] -> SYSTEM ->
[ENT] -> and input the password. This section explains what T/A, TEST, and REST
DSP are.
8.3.1 T/A
You can carry out DSC RX TEST by selecting this item and pressing [ENT] key. This
checks the reception sensitivity on CH70 RX board and monitors DSC signals from
other ships.
DSC RX TEST
OUTPUT RX DSC DATA
TO NMEA PORT
EXT : ENT
IF signal: 37.5 kHz from CH70 RX board is inputted into U17: CODEC and is
converted into audio frequency of 1700 Hz
±
400 Hz. Then, it is outputted into the
Handset ear-speaker and SP of the Transceiver unit. A converted frequency just
mentioned is digitized and is outputted into TXD LINE (#1-#2) on IEC61162/REMOTE
port on RS-422 level. This signal is not converted into DSC characters but is used as a
DSC RX raw data for type approval.
8.3.2 TEST menu
1. CPU
1.1 LOOP TEST
1.1.1 FSK LOOP
Not used.
1.1.2 REMOTE LOOP
Not used.
1.1.3 NMEA LOOP
Not used.
Содержание FM-8800
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