484 MSF & DCF radio time code receivers |
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The Wharton 484 series of radio time synchronisation receivers enable the time synchronisation
of 400A series clocks, calendar clocks, time zone clocks and master
clocks to accurate DCF and MSF radio time code signals.
MSF transmits on 60kHz from Athorn in Cumbria (latitude 54° 55' N and longitude 3° 15' W) with signals traceable
to an atomic clock at the National Physical Laboratory.
DCF transmits on 77.5kHz from Mainflingen, near
Frankfurt/Main in Germany with signals derived
from the Physikalish-Technische Bundesanstalt,
Lab. Zeitenheit.
In theory the signals are receivable at a range in
excess of 1000km from the transmitter, subject
to the effect of a wide range of variables such
as time of day, atmospheric conditions and the
degree of screening between the transmitter and
receiver. In practice increasing levels of noise
pollution, particularly from mobile radio systems,
result in a reduction of reception reliability
and we now recommend GPS time synchronisation
for time and reliability critical applications.
| how
radio time synchronisation works |
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| The MSF and DCF carriers
are interrupted every second to
encode time and date information
with a full time, date and status
message being transmitted every
minute. The length of the individual
carrier breaks determine the value
of the coded information and the
time of transmission within each
minute determines the identity
of each bit. |
| In addition to basic time and
date information a 'second
level' data set is transmitted
during the last few seconds
of each minute to provide
warning of impending seasonal
time changes, summer/winter
time status together with
parity bits which are
used as part of the validation
process for each message.
At the start of each minute
a unique bit pattern is
transmitted called the
'minute identifier'.
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| Due to the possibility of transient
interference or reception conditions
causing corruption of the transmitted
code signal or a total signal
loss, the clock or master clocks
use the MSF or DCF transmission
as an update reference comparison
rather than a continuous source
of time information. |
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| model
range |
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| 484.02 & 484.03 |
The 484.02 (MSF) and 484.03 (DCF) receivers are high
performance units with dual crystal filters and dual ferrite antennas
to provide omni-directional capability. The units are housed in robust IP65 rated cases
suitable for protected external mounting.
- case size: 160 x 80 x 55mm - 6.3" x 3.1" x 2.2"
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| 484.06 & 484.07 |
The 484.06 (MSF) and 484.07 (DCF)
receivers are low cost units with
unidirectional antenna, fitted
with a rotating mounting bracket
for alignment and intended for
internal use. Please note that
the 484.06 and 484.07 receivers
may not be suitable for use in
a building with a steel frame
or cladding.
- case size: 90 x 60 x 24mm - 3.5" x 2.4" x 0.9"
(excluding mounting bracket)
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| special
designs |
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| If you have a special master clock or
radio time synchronisation requirement that is not
covered by our standard range of products please do not hesitate
to contact our technical department. |
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