6.5 Timing Key Displays
27
Synchronization to a minimum of four satellites is necessary for precise determination of
longitude, latitude, and elevation. When meeting this minimum satellite lock requirement, its
position will accurately correspond to the present antenna location.
Longitude Display
Displays the antenna longitude in degrees, minutes, seconds and fractional seconds, East or West.
LONGITUDE
XXX
◦
XX’ XX.XXX" W
*
Where:
*
W
= WEST,
E
= EAST
Latitude Display
Displays the antenna latitude in degrees, minutes, seconds and fractional seconds, North or South.
LATITUDE
XX
◦
XX’ XX.XXX" N
*
Where:
*
N
= NORTH,
S
= SOUTH
Elevation Display
Displays the antenna elevation in meters and fractional meters referenced to the WGS-84 datum.
ELEVATION
XXXXX.XX m WGS-84
6.5
Timing Key Displays
6.5.1
Clock Status
Press the
TIMING
key to review the clock with regard to its accuracy and stability. While the clock
is starting and learning about its position, it is in the LEARN mode. It is a time when the clock
is most vulnerable to false, or incorrect, GNSS signals.
CLOCK STATUS
ACQUIRING TIME
6.5.2
Time Quality
The Model 1201B/C learn mode will typically last 24 hours before it switches to the normal mode.
During the learn mode, the clock is tracking its position and is vulnerable. During the normal
mode the clock is not affected by false or lost GNSS signals to upset the time, but relies on its
history and excellent holdover qualities.
TIME QUALITY
22.63 nSec
2.00
σ
