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 information 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).