Pactor-iii – Wavecom W-SPECTRA (Automatic Monitoring System) V1.1.0 User Manual
Page 159
WAVECOM Monitoring System W-SPECTRA, W-SPEED Manual V1.1.0
Transmission Modes
149
stream. After the modulation type has been determined, the resulting bit stream is de-interleaved, passed
through a Viterbi decoder and the CRC is checked.
PACTOR-II-FEC uses the same compression algorithms and CRC masks as PACTOR-II.
Options | CRC Recognition. The detected CRC is displayed in the decoder status bar, see “
” on page 43.
Using Options | CRC Table a certain CRC mask can be defined, see “
” on page 43.
Tuning a PACTOR-II-FEC signal
See “
” on page 147.
PACTOR-III
PACTOR-III is an adaptive transmission mode that provides higher throughput and improved robustness
compared to PACTOR-I and –II, both designed for operation within a bandwidth of 500 Hz. To achieve the
improved features, PACTOR-III uses up to a maximum of 18 tones spaced 120 Hz, thus occupying a max-
imum bandwidth of 2160 Hz. Six so-called Speed Levels (SL) are specified, which are predefined combi-
nations of modulation type (DBPSK or DQPSK), channel coding and number of tones (2, 6, 14, 16, or 18)
as well as positions of tones. For all Speed Levels, the modulation rate of each tone is 100 Bd.
Parameter
Value
Frequency range
HF
Operation modes
Half-duplex synchronous ARQ
Modulation
DBPSK, DQPSK; 2, 6, 14, 16, or 18 tones
Symbol rate
100.0 Bd
AFC
±50 Hz
Receiver settings
DATA, CW, LSB or USB
Input format(s)
AF, IF
Additional Info
ITA-5 with block coding
14.106 MHz, 21.112 MHz
Optional Mode
TONE
SL=1
SL=2
SL=3
SL=4
SL=5
SL=6
TF
0
Q
480
1
Q
Q
600
2
B
Q
Q
Q
720
3
B
B
Q
Q
Q
840
4
B
Q
Q
Q
960
5
B
B
B
Q
Q
Q
1080
6
B
Q
Q
Q
1200
7
B
B
Q
Q
Q
1320
8
B
Q
Q
Q
1440