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Press the ENTER key to recall the last User Bits that you entered into the generator. The display
prompt at the left of the display will blink while data entry mode is active, and the dual functioned keys
are now changed to their numeric values. If you want to re-enter these User Bits press the ENTER key
to complete the data entry into the generator.
Pressing any numeric key will clear the previous value and place the new value into the numeric
display, starting at the right. Pressing the SHIFT key and the numeric keys 0 to 5 will enter the
corresponding hexadecimal values A to F. Un-entered digits are assumed to be zero. When the
required number of digits are entered, press the ENTER key to complete the data entry into the
generator User Bits.
Attempts to enter too many digits will result in the display being blanked. Re-enter the correct value
and press the ENTER key. Pressing the ESC key will cancel the data entry mode without changing
any data.
The numeric keys return to their normal functions when the data entry has been completed by pressing
the ENTER key or cancelled by pressing the ESC key. The display prompt will return to its steady On
state when data entry mode has been completed.
Numeric entry mode must be terminated (GUB will be On steady) before any of the
front panel keys will resume normal operation.
3.4.4. Jam Syncing the Generator to the Primary reader
Pressing the JAM key transfers the primary reader's time into the generator clock, and then releases the
clock to run on its own. This mode is known as Momentary Jam Sync. (See section 3.5.1 for
information about selecting the primary reader.)
The generator time may be continuously slaved, or 'Jam synced' to data coming from the primary
reader by pressing the SHIFT+JAM keys. This mode is known as Continuous Jam Sync. The JAM
LED will be on when Continuous Jam Sync mode is enabled. Pressing the SHIFT+JAM keys again
terminates the Continuous Jam Sync mode.
Jam sync mode should be used when you need to generate ancillary time code that follows an LTC
source time code. In this mode the HD9010TM will function as an LTC to ATC translator.
Jam sync mode should also be used when dubbing longitudinal time code from one tape to another, as
the quality of the time code signal deteriorates with each generation, and will become unusable after the
third generation.
When the time information is being jammed the generator and primary reader's times are compared
with each other during each frame, automatically compensating for the value programmed into the
OFFSET register.
If for any reason they are not equal, the jam is bypassed, and the generator
substitutes the next frame number. The JAM indicator will blink off when a jam error is encountered. If
the number of consecutive jam bypass errors exceeds 5, the last valid primary reader's time is jammed
into the generator again with the programmed OFFSET. In the absence of valid reader data within the
last 5 frames, the generator operates according to the programmed NO CODE JAM mode (HOLD =
generator stops; RUN = generator increments normally; or MUTE = generator turns off) until valid
reader code resumes. At this time it will be re-jammed to the reader, thus repairing large dropouts on
the reader tape. (See section 3.4.9 for a full description of the NO CODE JAM modes.)
OPERATION
HD9010TM High Definition Time Code Master Manual
Revision 2.4.1
Page 3-11
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