4.2 ID Setting
4-11
Outline of ATIS
The operating INLAND channel transmits ATIS signals. When carrying this out is:
- When a continuous transmission takes place, at the end of each transmission.
- When transmitting continuously, ATIS signal is transmitted every 5 minutes.
TX output is normal and audio(voice) input is automatically set to OFF during a
ATIS signal transmission.
The system is a synchronous system using a ten-unit error-detecting code. The first
seven bits of the ten-unit code are information bits. Bits 8, 9 and 10 indicate, in the
form of a binary number, the number of B elements that occur in the seven
information bits, a Y element being a binary number 1 and a B element being a binary
number 0.
- Modulation frequency: 1300 Hz (Y=1) and 2100 Hz (B=0)
- Modulation rate: 1200 baud
- Modulation index: 1.0 + 10%
- Format
ATIS ID can be modulated by call sign. ID consists of :
Z MID X
1
X
2
X
3
X
4
X
5
X
6
- Z: represents the figure 9
- MID: represents the MID (Maritime Identification Digits) for R/R (Radio
Regulations)
- X
3
to X
6
:
shall contain the number of the call sign
- X
1
to X
2
: shall contain a figure representing the second letter of the call sign,
wherein 01 represents A, 02 represents B, -----.
For example, when the call sign is PC8075 and MID is Netherlands 244, ATIS ID is:
Call sign P C 80 75
ATIS ID 9 244 03 80 75
Signal Constitution 92 44 03 80 75
Note:
The first letter of the call sign (P): represents the country, so it is displaced to MID.
Dot pattern Phasing Format specifier Identification End of sequence Error check
20 bits 6 DX(125)
8 RX(111 to 104)
2 identical symbols
(121: 2 times)
5 symbols
(2 times)
3 DX(127)
1 RX(127)
1 symbol
(2 times)
ATIS ID, which is set up
by 244038075
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