Wavecom W61PC V7.5.0 - Manual (Page 135)

WAVECOM Decoder W61PC/LAN Manual V7.5 Transmission Modes  125
Tone Allocation
DIGIT Hz
0 400 7 1477
1 697 8 1633
2 770 9 1800
3 852 A 1900
4 941 B 2000
5 1209 C 2100
6 1335 D 2200
7 1477 E 2300
Tone duration: 100ms
CHU
CHU is a radio station operated by the National Research Council of Canada.
It continuously broadcasts time information on 3330 kHz, 7850 kHz and 14670 kHz.
The information provided is the Gregorian year, Julian date, UTC hour, minute and second. Further infor-
mation is a leap second warning, DUT1, the difference between the International Atomic Time TAI and
UTC and the code for the Canadian daylight time indication.
Parameter Value
Frequency Range HF
Operation modes Time information
Modulation FSK
Symbol rate 300 Bd
Center frequency 2125 Hz
Shift 200 Hz
Receiver settings DATA, CW, LSB or USB
Input format(s) AF
Additional info Reference tone on 1000 Hz
The coded message is transmitted using Frequency Shift Keying, the baud rate is 300 baud, the mark-
frequency is 2225 Hz, and the space-frequency 2025 Hz.
The display shows the information of each packet on a single line.
The first packet, sent at the 31st second of each minute, provides the year, the delta-information and the
daylight saving pattern code.
The following packets, sent between seconds 32 and 39, provide day, hour, minute and actual second.
The user can specify the polarity of the received signal, i.e. NOR(mal) or INV(erse).
CIS-11
CIS-11 transmissions are mainly in the Russian M2 (3-SHIFT-CYR) adaptation of the ITA-2 alphabet. It is
a full-duplex system with two transmission frequencies.