WAVECOM Decoders v6.15 W40PC, W41PC, W51PC
Transmission Modes
•
189
Modulation
SSB or DIRECT-FSK
Receiver settings
USB
Signal source(s)
AF or IF
Alphabet
STANAG 4285 is specified by the NATO (North Atlantic Treaty Organization) Military
Agency for Standardization in "Characteristics of 1200 / 2400 / 3600 Bits per Second Single
Tone Modulators / Demodulators for HF Radio Links" (16. February 1989).
The modulation technique used in this mode consists of phase shift keying (8-PSK) of a single
tone sub-carrier of 1800 Hz. The modulation speed (symbol rate) is always 2400 baud.
Using different M-PSK modulations and FEC (Forward Error Correction) coding rates, serial
binary user information (raw data) accepted at the line side input can be transmitted at different
user data rates.
STANAG 4285 single tone waveform has the following characteristics
Baud
Rate
User
data
rate
(bps)
No. of
bits per
symbol
(M-
PSK)
FEC
coding
rate
Interlea
ver
No. of
unknown
8-phase
symbols
(User
Data)
No. of
known
8-phase
symbols
(Channe
l Probe)
2400
2400
3 (8-
PSK)
2 / 3
SHORT
or
LONG
32
16
2400
1200
2
(QPSK)
1 / 2
SHORT
or
LONG
32
16
2400
600
1
(BPSK)
1 / 2
SHORT
or
LONG
32
16
2400
300
1
(BPSK)
1 / 4
SHORT
or
LONG
32
16
2400
150
1
(BPSK)
1 / 8
SHORT
or
LONG
32
16
2400
75
1
(BPSK)
1 / 16
SHORT
or
LONG
32
16
2400
3600
3 (8-
PSK)
No coding
No
interleav.
32
16
2400
2400
2
(QPSK)
No coding
No
interleav.
32
16
2400
1200
1
(BPSK)
No coding
No
interleav.
32
16
The user data is transmitted using a continuous frame structure. Each frame begins with a
33.33 ms preamble containing 80 symbols, the next 176 symbols are divided into four 32-
symbol data segments and three 16-symbol channel probe segments.
Summary of Contents for W40PC
Page 1: ...WAVECOM Decoders v6 15 W40PC W41PC W51PC by WAVECOM Elektronik AG...
Page 56: ...48 General Operating Procedure WAVECOM Decoders v6 15 W40PC W41PC W51PC...
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