Mitsubishi alpha 2 User Manual

α 2 Simple Application Controllers
DCF77 Radio Clock 10
ENG-48
10. DCF77 Radio Clock
The DCF77 function for the α2 series provides automatic setup of the RTC (Real Time Clock)
from receiving and decoding DCF77 time information that is broadcast over the radio signal
77.5kHz from Frankfurt/Germany.
DCF77
Deutschland
Radio band C
(long wave)
F
rankfurt
77
.5kHz
10.1 Introduction
The carrier amplitude is reduced to 25% at the beginning of each second for a period of 100ms
(binary:0) or 200ms (binary:1), except for the 59th second.
Table 10.1: Radio Clock
Item Content
Transmitter location Mainflingen, 25km south of Frankfurt/Germany
Frequency 77.5kHz
Transmission Range 2000km
Coding BCD (Binary Coded Decimal)
Transmitted Data minutes, hours, calendar day, day of the week, month, year
Transmission Time 24 hours daily

Mitsubishi alpha 2 Specifications

General

Brand	Mitsubishi
Model	alpha 2
Category	Controller
Language	English