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K
EYPAD
4.3.7 Switch on/off delay of the "Radio" Synchronisations Status
Valid for all synchronisation systems
With this sub-function it is possible to control the switching on/off of the synchronisation bit.
Selection frame:
SET TIME-OUT STATUS SYNCHRONISATION Y/N
Input frame:
SYNCHR.-STATUS ON/OFF AFTER: 000/055 MIN
NEW INPUT : _ / MIN
The old saved values are displayed in the upper line.
New values can be entered in the lower line.
Time for Synchr.-Status on
The value can be set between 000 and 255 minutes. This indicates how long synchronisa-
tion must be available through the source before the synchronisation bit is switched on. For
this display this means when the status changes from Crystal (C) to Reception (R). This
status is emitted on the bus so that a serial board, for example, also emits this status in its
data string.
This value should be set to 000 with DCF77-synchronised systems. With GPS-synchronised
systems it is only an advantage to a value other than 000 if the oven-stabilized quartz is in-
tegrated on the board. The value should then be about 10 to 15 minutes in order to bridge
the heating time of the quartz after switching on the system.
Time for Synchr.-Status off
The value can be set between 002 and 255 minutes. It indicates the period of time after
which the synchronisation bit should be switched back if no synchronisation is supplied by
the source. A value which is beneficial for DCF77 synchronised systems is about 55 min.
With GPS systems the value can be set to 255. The setting is, first and foremost, dependent
on the required freewheeling accuracy.
4.3.8 DCF77 Simulation
Valid for all systems
The Master Clock System simulates the DCF77 antenna and DCF77 pulse signal for syn-
chronisation of other hopf or foreign systems.
With this sub-function the signal output can be controlled.
Selection frame:
SET DCF-SIMULATION Y/N
Input frame:
H/L:200/100 T-OUT:055 STAT:00000010
INPUT:_ /
The time information is transmitted completely within one minute at a rate of one bit/sec. The
information is BCD-coded. A logical "0" is represented by 100 msec. and a logical "1" by 200
msec. amplitude reduction or pulse width (see
The narrow-band antennas of some radio-controlled clocks from some foreign manufacturers
falsify the length of the reduction, and, for this reason, the connected receiver is tuned to
other pulse lengths.
26 / 44
hopf Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: info@hopf.com
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DCF77 appendix).
7001GPS Satellite Clock System - V08.00
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