Mil-188-110A (W51Pc) - Wavecom W40PC Manual

Parameter
Frequency range
System
Tone duration
Shift
Modulation
Receiver settings
Signal source(s)
MFSK-20 is a sequential 20 tone mode, which is optimized for the transmission of numeric
codes. MFSK-20 is similar to SP-14 and AUM-13.
Most of the tones have been assigned a character:
All other tones are undefined.
A transmission is initiated with a start sequence, which identifies this mode and may be used
for accurate tuning. This sequence is transmitted at 1 Baud, which makes it readable even
during very unfavorable conditions.
The data is transmitted at a rate of 10 or 20 Baud. A block synchronization sequence is initially
transmitted followed by the five digit code words. If more than one block is transmitted, a
block synchronization sequence is inserted between the different blocks. As the transmission
rate is very low this mode is insensitive to fading and multipath propagation.

MIL-188-110A (W51PC)

Parameter
Frequency range
System
Baudrate(s)
Modulation
Receiver settings
Signal source(s)
MIL-188-110A Serial (single tone) is one of the most popularly used modes in long-haul HF
data modems. This is specified by the US Department of Defense (DoD) in the "Military
Standard Interoperability and Performance Standards for Data Modems" (30. Sept. 1991)
This mode employs 8-ary phase-shift keying (PSK) on a single carrier frequency (1800 Hz) as
the modulation technique for data transmission. Serial binary information (raw data) accepted
at the line side input is converted into a single 8-ary PSK-modulated output carrier. The
modulation of this output carrier is a constant 2400 Baud waveform regardless of the actual
user data rate.
WAVECOM Decoders v6.15 W40PC, W41PC, W51PC
Value
HF
MFSK
100 ms, 50 ms
760 Hz
SSB or DIRECT-FSK
CW, LSB or USB
AF or HF
•
10 tones are assigned to the numerals 0..9
•
One tone is used as an idle character
•
One tone is used as a space character
•
·One tone is used as a repetition indicator
•
.Six tones are assigned to characters
Value
HF
8-PSK
2400.0 Baud
SSB
USB
AF-IN, IF-IN-VAR, IF-IN-10.7 or IF-IN-
21.4
Transmission Modes • 159