WAVECOM Decoder W74PC, W-PCI/e, W-CODE, W-CLOUD Manual V9.1.0 Transmission Modes
137
110, 120, 150, 180, 200, 300 and 600 Bd, variable 50–1200 Bd
BULG-ASCII is a full-duplex mode using go-back-7-frames ARQ and a variable data frame length. Frames
are transmitted with a preceding frame counter for transmitted and received frames and an appended CRC
check sum.
ASCII modes using iso-asynchronous start-stop bit patterns are frequently encountered in the HF bands.
BULG-ASCII employs the standard ITA-5 alphabet, a national alphabet and transfers compressed and en-
crypted messages and files.
CCIR
The entire call number is transmitted by consecutive tones in decade sequence. When two identical digits
are to be transmitted consecutively, then an eleventh frequency is used as a repetition identifier. If more
than two identical digits are to be transmitted, the repetition tone is appended to the digit tone (e.g.,
22222 is transmitted as f2 fw f2 fw f2, where f2 is the tone for "2" and fw is the repetition tone).
In most systems the accuracy of the single frequencies has to be within +1/-1.5% of the nominal value.
Decoding the selective calls is started by clicking on a system. If transmission and system selection con-
form, the call sign is displayed on the monitor. In the Options menu a Time stamp function can be ena-
bled to add date and time to each call.
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