WAVECOM Decoder W-PCI/e, W-CODE, W

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Parameter Value

Center frequency

Receiver settings

1760 Hz

DATA, CW, LSB or USB

Input format(s) AF, IF

BINARY, HEX and ASCII output are provided.

MIL-188-110-39Tone, (MIL-188-110A/B Appendix C)

MIL-STD-188-110 39 Tone is a non-mandatory part of the MIL-STD-188-110 military standard for use by all departments and agencies of the Department of Defense.

Parameter Value

Frequency range

Operation modes

PSK, Simplex

Modulation

Symbol rate

Center frequency

Receiver settings

Input format(s)

39 tone Q-DPSK

44.44 Bd

1800 Hz

DATA, CW, LSB or USB

AF, IF

Definition

The modulation technique used in this mode consists of differential quadrature phase shift keying (QDPSK) of 39 orthogonal sub carriers in the range from 675Hz to 2812.5 Hz, and an additional unmodulated Doppler reference tone at 393.75Hz.

The modulation speed (symbol rate) is always 44.44 Bd. Through the transmission of redundant information on certain tones, different user data rates can be achieved within a range of 75 to 2400 bps.

This mode uses FEC and interleaving to combat the effects of fading, frequency shift, multipath, and burst noise.

The user data is transmitted using a continuous frame structure with a variable block length (number of symbols), depending on user data rate and message type.

Each transmission starts with a preamble, consisting of three phases, followed by block synchronization and data segments. The data block immediately follows the next block synchronization segment defining again the start of the next data block. This repeated frame structure enables synchronization of the demodulator at any time of transmission.

The end of transmission is determined by an EOM sequence (at least ten ones "1").

Data Display

There are two different types of data transmissions - synchronous and asynchronous.

In the synchronous data mode, the data is bit synchronously displayed as 7 bit characters, while in the asynchronous mode, different character lengths are possible using start, stop and parity bits. The parity,