Technical data

Installation & Operation Manual GM-TTT
Page 72
6.2 Maintenance
Placement of fuse, modules, SW1 and pots for adjustments
SW1: LTC output floating yes/no:
In position 1 (factory setting) = not floating:
Pin 1 of the LTC Out connector is GND, the signals at pin 2 and 3 are inverted
against each other and each of them is symmetrical to pin 1. The output level
between 1-2 and 1-3 is set according to the menu. Neither pin 2 nor pin 3 shall be
externally connected to GND.
In position 3 (floating):
Pin 1 of the LTC Out connector is the center tap of the transformer, all pins are
floating. Pin 1 should be connected to external GND to be able to use a balanced
output. To obtain an unbalanced output, pin 2 = GND and pin 3 may be used as the
unbalanced signal (or vice versa), then the output level is twice as high as the value
indicated in the menu. In this case pin 1 must remain open and should not be
connected to GND. A GND connection with the equipment may be realised by using
the contact to the XLR connector case.
RV1: Adjusts the LTC output level.
RV2: Adjusts the rise and fall time of the LTC signal.
RV3: Adjusts the frequency of the quartz oscillator.
When aligning with a frequency standard:
IC13.83 = 16 MHz,
IC13.13 = 2 MHz.
When aligning with a video generator in the 625/50 TV system: the measurement
result displayed in the TEST - 2 menu should be 39 99 99 37.