Document: 1856en01.doc
QWTIME III MASTER CLOCK
Author: PM
Date: 2011-02-25
User Manual
Page: 4 o f 23
WESTERSTRAND URFABRIK AB
P.O. Box 133
Tel. +46 506 48000
Internet:: http://www.westerstrand.se
SE-545 23 TÖREBODA
Fax. +46 506 48051
E-mail:
General description
Westerstrand master clock WDP-WL is a fully electronic Master Clock with built-in radio transmitter.
WDP-WL is a part of Westerstrand Wireless Clock System, a fully automatic system for wireless control of
analogue and digital clocks. The transmitter is a UHF crystal-based FSK transmitter using the licence free ISM
band. The transmission frequency is 869.525 MHz with a 10% duty cycle.
The transmitter sends a time message every ten seconds. The transmitter power can be adjusted in three steps:
25 mW (+14 dBm), 100 mW (+20 dBm), 500 mW (+27 dBm). For optimal range, the transmitter is equipped
with a quarter-wavelength stub antenna.
Summer/winter time correction (daylight saving) is pre-programmed and fully automatic.
In case of power failure the built in Real Time Clock keeps the internal time updated.
Indication for alarm
Indication for mains voltage
Indication for radio synchronisation
Not used
Connection space
