NGT-200 USER MANUAL
NGT-200 UM.E 20210520-02
39
RxX -
where
X
(
A
or
B
)
is the AIS channel of
received message;
ID 4 –
Base station report
– main report of
base station;
413000234
– MMSI number of the station
under test;
dF +123
– carrier frequency deviation of AIS
transmitter.
RSSI 39.9 dBm
– power level of AIS station
transmitter;
A
– measurement configuration,
A
stands for “External attenuator”;
Slot 1784
– received slot number (
as
example only
);
– Status Bar , 4-cell complete state.
The complete state of the status bar confirms
that the tester has collected all necessary
information about device under test and is ready
to save the data into non-volatile memory. In
this mode Tester waits for only Message 4.
5.3.7
Ship Emulation
Entering the menu user should select the channel for testing (A or B).
Virtual
ship
emulation
procedure
is
performed as follows:
Tester sends the message 1 with the tester’s
MMSI code and increased on about 0.1 nautical
mile to the last received message coordinates.
As a result the virtual ship with a little different
coordinates should appear on tested AIS station
LCD.
After pressing
Enter
, a message
“Wait !”
will
appear on the screen. The message transmission
will be performed after the audio signal.
NOTE: It is important to receive at least one
message in
AUTO TEST
mode or
AIS
MONITOR
mode and only then one should
perform
the
ship
emulation.
The
synchronization of the Tester and AIS station
as well as the definition of virtual ship
coordinates are required.
== Test Base st.==
RxA ID 4 413000234
dF +123
A RSSI 39.9 dBm
Slot 1784
........
Save-F2
Prof: X
= Ship Emulation =
Channel A
Channel B
= Ship Emulation =
Channel A
From: 413999997
Start – ENTER