68 Camera Controls
Regen Rec Run TC is regenerated from the last valid TC
value.
With Ext LTC, it means that the camera is
continuously reading the TC signal at the LTC socket
as long as it is present. Only upon disconnection or
loss of signal, the camera continues counting on its
own. When the external signal reappears, the
camera uses the values of the external signal again.
With Int TC, the value is increased with each new
image generated by the sensor.
Jam sync Only Ext LTC can be jam synced. 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. Due to a highly
precise crystal oscillator in ALEXA, the internal
counter will count accurately for 8 hours. After that
period, the camera has to be resynced to avoid any
TC offset.
The camera can be synced to TC signals whose time
base differs from the camera's project fps, 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 signals of these two groups.
Note: It is recommended to sync after every shooting break to avoid the risk of having
to resync during the shoot.
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.
Userbit source: shows the source of the user bits.
Internal User bits are set manually in the User Bit screen.
LTC in UB When using Ext LTC as TC source, the user bits
are sampled from the external signal.
Press the SET TC screen button to adjust the TC counter (only with Int TC
as source). Reset it or match it to the system clock with the upper screen
buttons that appear during edit mode.
Note: The camera will force Time code to "Internal Rec Run Regenerate" if the
sensor fps does no match the project fps!
The PROJECT button is a quick link into the PROJECT menu screen, where
project fps can be adjusted. Project fps sets the time base of the time code.
Note: Non-integer TC time base settings 23.976 and 29.97 are currently always
counted as non-dropframe time code!
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