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Operating basics

ANTENNA: Input

connector for a GPS and/or GLONASS antenna.

The antenna input must meet speciﬁc requirements. (See page 3-103,

GPS/GLONASS antenna requirements.)

You can use the GPS7 module menu to enable this connector to provide 3.3 V

or 5 V DC power to the antenna. When the connector is conﬁgured to provide

power to the antenna, the rear-panel POWER indicator lights as follows:

Blinks green to indicate an open circuit. This occurs if no antenna is

connected or if the current load is less than expected because a splitter

or DC block is being used.

Displays solid red if the connected antenna is shorted. A shorted antenna

will not damage the GPS7 module. If a splitter is used on the antenna, it

may appear as a short at DC but will still pass through the RF signal,

which wi

ll allow the GPS to function.

Displays solid green if the current load of the antenna is within the

nomina

lrange.

LTC/GPI: 15 pin, D-sub connector that carries four differential LTC signals,

one gr

ound closure input, and two ground closure outputs. You can use the

menus to independently set the format and timing of the four LTC signals and

to select the f unction of the ground closure input and outputs.

You can conﬁgure LTC1 to be an LTC input instead of an output. The

supported LTC input signal formats include 23.98, 24, 25, 29.97 drop frame,

and 30 Hz, as per SMPTE 12M.

The LTC/GPI connector provides full functionality when you use the LTC

DSUB-to-XLR breakout cable that is available as an optional accessory with

the GPS7 module. The LTC/GPI connector provides partial functionality when

you use a standard RGBHV (VGA-to-BNC) breakout cable. (See Table 2-4.)

OTE. You do not need the optional LTC and GPI breakout cable if you are using

only VITC and/or ATC as a timecode signal.

For correct operation if you use a VGA-to-BNC breakout cable, pins 6, 7, 8, and

10 must be internally grounded together in the cable and to the connector shell.

TG8000 Multiformat Test Signal Generator User Manual 2–13

Tektronix TG8000 User Manual

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