External oscillator

Platform:

OEM729, GT7800

This feature is supported only on the OEM729.

The GT7800 contains an OEM729 and supports the same external oscillator functionality.

For applications requiring greater precision than what is possible using the on-board Voltage Controlled, Temperature Compensated Crystal Oscillator (VCTCXO), the OEM729 can be connected to an external, high stability oscillator, at 5 MHz or 10 MHz.

Connect a cable from the external oscillator to the receiver’s external oscillator input connector. For the OEM729, a MMCX female connector (J1901) is used as shown in Figure: OEM729 connector and indicator locations. The receiver does not have to be powered down during this operation. However, if handling a card directly, observe anti-static practices. The OEM729 input impedance is 50 ohms.

When the external oscillator is installed, use the EXTERNALCLOCK command to set the clock type (e.g.: cesium, rubidium or ovenized crystal) and frequency.