Technical data

Installation & Operation Manual GM-TTT
Page 26
2.4 TC Operating Mode
Select this operating mode for a Jam-Sync application like refreshing, regenerating, synchroni-
sation etc.
The LTC generator accepts data from the LTC input after the LTC has passed three tests:
‘forward’ direction must be detected, it must contain a valid time and the time addresses of
two consecutive frames must be in ascending and continuous order.
Submenu LTC IN provides all adjustments regarding the Jam-Sync operating mode. The Jam-
Sync can operate as a One Time Jam-Sync, as a Continuous Jam-Sync, or as Jam-Sync with
Stop:
• One Time Jam-Sync: having accepted the first data of the LTC input the One Time Jam-
Sync will transfer these data to the generator, then the tc operating mode will be switched
off and the start operating mode will be switched on automatically. If binary groups data
should be transferred and kept, then USER MODE = 0 SET should be selected (at menu
SET - ... - USER MOD)!
• Continuous Jam-Sync: with this mode the generator keeps on counting if there are no LTC
input (unlimited flying wheel).
• Jam-Sync with Stop: this mode forces the generator to stop after a programmed number of
frames if there are no LTC input (drop-out compensation) and if the Jam-Sync is program-
med to transfer time data. In case of such a stop the LTC output can completely be sup-
pressed (Stand-By feature) or LTC can be generated having equal time addresses in each
frame (Still feature).
LTC output frequency
• 1
st
preference: If the unit works within a television system, choose genlock to a black-burst
or video signal (select genlock = bb at menu SET - ... - LOCK and press genlock button).
• 2
nd
preference: With a stable external LTC signal choose genlock to LTC (select genlock =
LTC at menu SET - ... - LOCK and press genlock button). The LTC output gets a frequency
and phase adjustment to the LTC input. With this genlock mode it can be programmed
(menu LTC IN - MODE) that a data transfer from LTC input to LTC output only happens if
the generator locks to the LTC input, so no Jam-Sync at jog or shuttle frequencies will be
allowed.
• 3
rd
preference: Press intern button to select the internal reference.
Internal clock, time/date handling
• The internal clock get a pre-set from a built-in or external real time reference. The mode of
operating with the reference time input is selected at menu REFER - MODE1 and MODE2.
Time zone programming is done at submenu ZONE (select the offset and the Daylight
Saving Times).
• If any time and/or date applications should be kept during the tc operating mode, the LTC
output frequency should be locked to a stable reference, because this is the frequency of
the internal clock as well. The internal clock can be programmed to get a time and date
update every second (menu REFER - MODE 1), in that case the internal clock follows the
reference time mostly independent from the LTC output frequency. The transfer of binary
groups data from the LTC input should be switched off (menu LTC IN - MODE), so the
binary groups of the LTC output contain the data as selected at menu SET - ... - USER