Sound Devices 744T - Manual (Page 40)

744T User Guide and Technical Information
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v. 2.67 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
NTSC Standard Def Video Production
NTSC video uses a frame rate of 29.97 frames per second. Unfortunately, that leaves 108 frames per
hour unaccounted. To keep 29.97 time code in sync with “clock” time, the concept of “drop frame”
was devised. Two frames are dropped at the top of each minute not divisible by 10. 54 drops per
hour x 2 frames = 108 frames per hour.
To sync the 744T to a video camera, first determine if the camera is in drop frame or non-drop frame
mode. If you, the DP or the producer are unsure about what setting to use, check with post-produc-
tion, if possible.
As a rough guideline, video for NTSC broadcast is drop-frame. Whether at drop or non-drop rates, make
certain all time code devices are at the same rate.
1. Set the 744T to either 29.97DF or 29.97 respectively.
2. Jam the camera using a LEMO-5 to BNC adapter cable connected to the time code input on the video
camera.
3. Switch the camera to free run time code. The 744T time code should appear in the time code display on
the camera.
4. Disconnect the time code cable.
The camera and recorder time code should now be running in sync. Check it after roughly 5 minutes
to be certain synchronization is maintained.
Video cameras are notorious for time code instability when switched off. If the video camera must be shut
down, re-jam it when it is powered back up.
Recording
The user interface of the product has been designed similar to a “tape recorder”. Recording and play-
back functions are quite similar to that of tape-based machines. The flexibility of file-based recording
provides control not possible with tape-based recorders.
Recording
The largest, most easily accessed control on the 744T is its record key. Recording takes
priority over all activity except for disk formatting, disk speed tests, and file transfers. The 744T im-
mediately enters record mode when the REC key is pressed. When recording, the adjacent red LED
will illuminate to indicate that the unit is in record mode.
In the event that the system is not ready to begin a new file, the recorder will enter standby mode.
“REC Pending” will appear in the File Name field of the LCD display and the adjacent red LED will
flash. The 744T will immediately begin recording as soon all selected media is ready.
If no inputs are routed to tracks, recording cannot take place. Make certain that at least one record track is
assigned for recording.