Reference Frequency Source

The Reference Frequency is a 10MHz signal that is used extensively inside the GPS receiver. All of the signal tracking functions are dependent on this source. The Reference Frequency can be provided by either an Internal crystal oscillator or an External electrical signal. The Reference Frequency control page allows you to select between these two sources.

When the Reference Frequency Source is changed, the GPS receiver must stop tracking all satellite signals and then re-acquire them. This will cause an interruption of GPS measurements, possibly lasting for a few minutes.

EXTREMELY IMPORTANT: If you switch to using an External Reference Frequency, but do NOT provide a valid 10MHz signal, the NetRS will be unable to acquire and measure GPS signals. When the The Reference Frequency Source page is displayed, it shows an indication of whether a valid 10MHz source is detected. Note that this indication does NOT dynamically track the state of the signal. You must refresh the page in order to get a new reading of the signal.

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