Section 1: General Information
Page 1-4
NetClock/GTP Instruction Manual
1.5 SPECIFICATIONS
This section contains specifications for the Model 8183A NetClock/GTP, Model
8225 GPS Antenna and antenna accessory products available from Spectracom.
1.5.1 Receiver
Received Standard:
L1 C/A Code transmitted at 1575.42 MHz.
Satellites Tracked:
Up to eight simultaneously.
Acquisition Time:
Typically <20 minutes from cold start.
Acquisition Sensitivity:
-105 dBm to -137 dBm.
Tracking Sensitivity:
-139 dBm.
Timing Accuracy:
<500 nanoseconds with Selective Availability
“SA”
on.
Antenna Connector:
BNC female.
1.5.2 Display
Display Type:
Red LED.
Digit Height:
0.8 inches for day of the year, hours and minutes.
0.56 inches for seconds.
Display Options:
12 or 24-hour format, UTC or local time, enable
DST/STD time changes.
1.5.3 Status
Indicators
Front panel bi-color LED’s indicates operational status.
GPS Lock:
Indicates GPS satellite tracking status. Lamp is green
when the receiver has tracked at least one satellite
within the period allotted for the GPS Lock Alarm.
The lamp is red during initial operation or whenever a
GPS Lock Alarm or CPU Alarm is asserted. The GPS
Lock Alarm period is programmable up to 23 hours:
59 minutes: 59 seconds in 1-second increments.
Factory default is 15 minutes.
