Wavecom W61PC V7.5.0 - Manual (Page 239)

WAVECOM Decoder W61PC/LAN Manual V7.5 Transmission Modes  229
STANAG-5065-FSK
STANAG-5065 is a asynchronous FSK system and was developed to provide NATO countries with interop-
erable shore-to-ship broadcast communications using the low frequency (LF) band (specifically 60 kHz-
160 kHz).
Parameter Value
Frequency range VLF
Operation modes Broadcast
Modulation MSK
Symbol rate 50, 75, 100 or 150 Bd
Center frequency 975 Hz
Shift 85, 850 Hz
Receiver settings DATA, CW, LSB or USB
Input format(s) AF, IF
Additional Info Async FSK only
For STANAG-5065 FSK mode standard baud rates from 50 to 150 Bd are available. Non-standard baud
rates may be selected using the Baudrate menu item.
From Options | Display… ASCII and BAUDOT ar available as an output formats.
SWED-ARQ
SWED-ARQ is an adaptive telegraphy system which operates at a rate of 100 Bd.
Parameter Value
Frequency range HF
Operation modes Simplex ARQ
Symbol rate 100 Bd, variable 30-650 Bd
Modulation FSK
Receiver settings DATA, CW, LSB or USB
Input format(s) AF, IF
Additional Info SITOR Alphabet
Three different block lengths are used in SWED-ARQ. The short block containing three characters is essen-
tially the same as the SITOR-ARQ mode. If favorable propagation conditions prevail the system will switch
to medium block length (9 characters) or to long blocks (22 characters). In case of interference the block
length is automatically reduced. The block length is displayed on the status line as either short, middle or
long. Longer block lengths effectively increase the data transfer rate. The equivalent Baudot rates are 75
and 100 Bd for medium and long block lengths respectively.
The illustration depicts the protocol of data transmission for the SHORT, MEDIUM and LONG block types.