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Connecting the word clock input
All of the NADAC’s digital processes have to work in synchronization to ensure their proper
function. In the normal mode of operation this is achieved using a synchronizing signal generated by the
unit’s own internal clock circuit. The NADAC may also be used with an external synchronization
source, which is called a Word Clock generator. This is connected to the Word Clock input connector located
on the rear panel just below the AES/EBU digital input - Figure 6.
To connect the NADAC to a word clock generator you will require a cable fitted with male BNC to
BNC connectors. The cable should also have a characteristic impedance of 75 Ω.
To connect the cable, offer it up so that the two diametrically opposed pins on the outside of the rear panel
connector, fit into the corresponding grooves in the inside of the cable connector’s locking ring. Push the
cable in and turn the locking ring clockwise so that it locks firmly. To remove the BNC cable, push the cable
connector forward slightly and turn it anti-clockwise as far as it will go. The cable may now be removed from
the unit.
Before attempting to use the unit with an external clock source please see the section
Synchronizing the
NADAC to an External Source
on page 40. Please also be aware the word clock input has a 75Ω
terminating resistor that can be switched in and out of the circuit via the WCK Termination page in the System
menu – see page 33. Failing to set this appropriately may compromise the unit’s performance.
Figure 8. BNC to BNC cable.
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