2 Overview DCF600HS
2.4 Assignment of the Terminal Connectors
Assignment of the terminal block:
1
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VDD:
positive potential
of power supply
GND:
reference potential
of power supply
Photocoupler outputs (PPO)
1:
PP 1-
Emitter of photocoupler
2:
PP 1+ Collector of photocoupler
3:
PP 2-
Emitter of photocoupler
4:
PP 2+ Collector of photocoupler
5:
Ground Earth
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2.5 Mounting the Antenna
Generally it is important to position the antenna in an optimal way. The antenna should be aligned at a right
angle to the direction of the transmitter (Frankfurt). It should be mounted at least 30 centimeters away from
the clock unit and from solid steel. A distance of several meters is recommended to all TVs or computer monitors.
If the antenna is installed properly and the signal from DCF77 can be received without strong distortions,
the "Mod." LED starts blinking exactly once per second, corresponding to the time marks from DCF77. If this
LED flashes intermediately, there is some electrical noise around which prevents the microprocessor from de-
coding the time message. So a better location for the antenna must be found. In case of correct reception it
takes up to three minutes after power-up until the clock is synchronized and the "FR" LED is turned off. It is
turned on again to indicate the loss of or an error in reception. If the clock have lost reception for more than 2
hours the "FR" LED starts blinking. The scope of supply includes an active ferrite antenna for indoor mounting
(AI01) and 5m of RG174 coaxial cable. When mounting the antenna outdoor the weather proof Antenna AW02
is to use.
1
tightening torque of the screws in the terminal block max. 0,9 Nm
DCF600HS
Date: 24th July 2018
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