U4221B Datasheet, PDF (8/12 Pages) TEMIC Semiconductors – Radio Controlled Clock Receiver

U4221B
Information Regarding German Transmitter
Station: DCF 77,
Frequency 77.5 kHz,
Transmitting power 50 kW
Location: Mainflingen/Germany,
Geographical coordinates: 50_ 0.1’N, 09_ 00’E
Time of transmission: permanent
Time Frame 1 Minute
( index count 1 second )
Time Frame
0 5 10 15 20 25 30 35 40 45 50 55 0 5 10
coding
when
required
Example:19.35 h
s124
minutes
hours calendar day month year
day of
the
week
93 7527
8 10 20 40 P1 1 2 4 8 10 20 P2
sec. 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35
minutes
hours
Start Bit
Parity Bit P1
Parity Bit P2
Modulation:
The carrier amplitude is reduced to 25% at the beginning
of each second for 100 ms (binary zero) or 200 ms (binary
one) duration, excepting the 59th second.
Time Code Format: (based on information
of Deutsche Bundespost)
It consists of 1 minute time frames. No modulation at the
beginning of the 59th second to recognize the switch over
to the next 1 minute time frame. A time frame contains
BCD-coded information of minutes, hours, calendar day,
day of the week, month and year between the 20th second
and 58th second of the time frame, including the start bit
S (200 ms) and parity bits P1, P2 and P3. Further there are
4 additional bits R (transmission by reserve antenna), A1
(announcement of change-over to the summer time), Z1
(during the summer time 200 ms, otherwise 100 ms), Z2
(during standard time 200 ms otherwise 100 ms) and A2
(announcement of leap second) transmitted between the
15th second and 19th second of the time frame.
8 (12)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 15-May-96