Free Run TC runs free. If the source is set to Int TC, and the
sensor frame rate does not match the time base
of the TC, the value counts up with every new
frame generated by the sensor in the project time
base.
Select Generator to set the camera’s timecode generator. Available
generators are:
Regen Rec Run TC is regenerated from the last valid TC
value. When set to Ext LTC, the camera
continuously reads the TC signal at the LTC
connector as long as it is present. Upon
disconnection or loss of signal, the camera
continues counting on its own. When the external
signal is reconnected, the camera uses the values
of the external signal again.
When set to Int TC, the value increases with each
new frame generated by the sensor.
Jam sync Only Ext LTC can be jam sync'd. This means that
the external TC source is connected to the
camera, then the camera reads the external TC
count and continues counting on its own. The
precise crystal oscillator in the ALEXA will count
accurately for up to eight hours. After eight hours,
re-jam sync the camera to prevent timecode
offset.
The camera can be sync'd to TC signals whose
time base differs from the camera's project time
base, as long as both are integer (24, 25 and 30
fps) or non-integer (23.976 and 29.97 fps) signals.
It is not possible to mix integer and non-integer
signals.
Note: It is recommended to jam-sync after every shooting break to avoid the
risk of losing timecode sync during a shot.
Note: The camera will keep its TC for about 10 minutes after disconnection from
the power source. If a power source is connected, the camera will remember its
TC for as long as the power source is connected, even if it is switched off.
Select User bit source to set the source of the user bits. Available user
bit sources are:
Internal User bits are set manually in the User Bit
screen.
UB in Ext TC When the timecode source is set to Ext LTC,
the user bits are sampled from the external
signal.
Note: The camera will force timecode to Int TC and Regen if the sensor frame
rate does not match the project frame rate.
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