Grass-valley 7600REF Manuel d'utilisateur télécharger pdf (Page 52)

52 7600 SD/HD/MHD-REF — Instruction Manual

Operation

Option Menus

Available options on the different model types are enabled at the factory.

An option will appear in the menu trees if it is included in the model. Refer

7600REF Models on page 18 for the list of options included in each model.

GPS Setup (7600 MHD-REF)

The GPS module comes with the 7600-MHD-REF model and is installed in

Slot 1. The Global Positioning System (GPS) is currently the only fully-func

tional Global Navigation Satellite System. More than two dozen GPS satel-

lites are in medium Earth orbit, transmitting signals allowing GPS receivers

to determine the receiver’s location, speed, and direction.

GPS also provides a precise time reference used in many applications

including synchronization of telecommunications networks.

The GPS BNCs (and the AES unbalanced outputs) active on the 7600

MHD-REF model are shown in Figure 25.

Figure 25. GPS BNCs

• The 1PPS (1 Pulse Per Second) output is a precise TTL level pulse which

may be terminated into 75 ohm when connected into external equip-

ment.

• The GPS antenna input should be connected to a high quality 50R GPS

antenna.

• The AES 1 and 2 outputs provide an unbalanced duplicate of the

signals on the AES 9 pin Sub-D connector (Table 2 on page 24). These

are not related GPS operation and are provided for convenience from

this module.

AES 1

AES 2GPS 1 PPS

10/27/WC OUT 5/10 REF IN

LOOP

GENLOCK

AES 1 and 2 Unbalanced

Audio Outputs

GPS Receiver

Antenna Input

GPS Receiver

1PPS Output

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 83 84

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Grass-valley 7600REF Manuel d'utilisateur Page 52