Leica GR10 Operational Manual page 138

Operational Manual (Online Help)
Oscillator
Oscillator
Fallback to internal oscillator
Frequency
Process noise element h , h
0
and h
1 -2
Restore default values
136
Description
An external oscillator can be used to provide a better quality time signal to the receiver
than that of the receiver's internal clock.
When using an external oscillator, the same external oscillator can be used for a
number of receivers, so that each receiver is guaranteed to be tracking satellites using
the same time signal.
An external oscillator is attached to the receiver via the OSC port.
Select Internal to use the receivers internal clock, or if an external oscillator is
connected to the oscillator port, select the type of external oscillator.
•
TCXO: A temperature compensated crystal oscillator (TCXO) is used.
•
OCXO: An oven controlled crystal oscillator (OCXO) is used.
•
Rubidium: A rubidium based external oscillator is used.
•
Cesium: A cesium based external oscillator is used.
•
H-maser: A hydrogen based external oscillator is used. The H-maser setting
can be used to set up a user defined external oscillator.
If an external oscillator is selected but not connected, the receiver will
not track any satellite signals.
Only available when an external oscillator is selected. When activated and the external
clock signal is not available for more than 5 minutes, the receiver will switch to the
internal clock.
Once the fall back has occurred, the Check/Revert to external oscillator
will be displayed. This button allows checking if the external oscillator is available again.
When using this button, the receiver will check for a time signal from the external
oscillator and switch to the external oscillator when available. If the external oscillator is
still not available when this button is pressed, a message will be shown in the event log
and the receiver will continue to use the internal oscillator.
This is a single fallback after 5 minutes without automatic return to
external oscillator.
The fallback to internal oscillator will also occur when the antenna is
disconnected for more than 5 minutes.
Select the frequency at which the external oscillator is set to work.
Only available when using an H-maser external oscillator.
-
Set the values for the 3 process noise elements of the linear portion of the clock model.
There are the h , h and h
0 -1
describe the frequency noise characteristics of an oscillator.
Press to restore the default values.
elements of the power law spectral density model used to
-2
button