Synchronising The Dcs 992 To A Gps Clock; Figure 15 - Synchronising Dcs 992 To A Gps Clock - DCS 992 User Manual

dCS 992 User Manual
dCS Ltd

Synchronising the dCS 992 to a GPS Clock

1PPS 10MHz RS-232
AES 1 AES 2 AES 3
8
this software version or higher
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Global Positioning System – an absolute position location system based on transmissions from an array of
orbiting satellites, originally used by ships.
Manual part no: DOC063992 iss 2A1
Contact on + 44 1799 531 999
dCS
(inside the UK replace + 44 with 0)
A dCS 992 Master Clock
one set of units, all at different sample rates, and be the master. DVD
production may require different sample rates for different channels – this set up
will give real time 48 kS/s rear channels and 96 kS/s front channels from a multi-
channel 44.1kS/s source. For all dCS 972 units, set the
option to On. They will all set up as slaves. Make sure that all the other
settings are the same on each unit in a group.
The Bang-On
GPS Clock Co.
10MHz +/-0.1ppt
AES 4 1 2
7 8
Figure 15 – Synchronising dCS 992 to a GPS clock.
The dCS 992 may be slaved to the very accurate 10MHz signal generated by a
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GPS Clock. The microwave carrier from the satellite is derived from an atomic
frequency standard, giving a long-term accuracy of the order of 0.1ppt (parts per
trillion). Unfortunately, the receivers can show Doppler shifts from the satellite
signals, and there may be times when not enough satellites are available to lock
to. It is probable that the 0.2ppm variations seen in
GPS Doppler shifts.
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can also be used to sync up the source and more than
GPS clock
ANTENNA
3 4 5 6
9 10 11 12
Page 42
Manual for Software Version 2.0x
January 2001
Multi-channel Sync
Roof-mounted
GPS antenna
In Mains Fuse (2AT)
External
Loop
Remote
Sync
Out
Figure 18 are caused by
file 063992ma2a1.pdf available from website
email to: more@dcsltd.co.uk
web site: www.dcsltd.co.uk
dCS 992
On Off