Introduction to the SINAUT ST7 system
2.7 Radio clock components
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
81
DCF77 antennas
Response time
< 1 ns
Protection level at 6 kV 1.5/50 µs wave at input
< 12 V
Insertion loss for DCF77 signal
Max. 3 dB
Input / output
BNC female / BNC female
Input / output impedance
50 ohms
Degree of protection
IP40
Temperature range
•
Operation
•
Storage
•
-20 °C t80 °C
•
-40 °C t85 °C
Humidity
95% no condensation
Technical specifications of the GPS receiver
GPS receiver
Interfaces:
•
RS-232/RS-422
•
Pulse outputs
•
GPS input
•
DCF77 simulation output
•
9-pin D-sub male connector
•
Screw terminals
•
BNC socket
•
BNC socket
Connector for power supply
Screw terminals
Power supply
18 to 60 V DC
Power consumption
6 VA
Construction
•
Housing material
•
Dimensions (W x H x D) in mm
•
Weight
•
Aluminum
•
65 x 105 x 130
•
Approx. 700 g
Installation
On 35 mm standard rail
Quartz accuracy
± 0.1 ppm after GPS control/synchronization and
at constant temperature
Emergency clock accuracy
± 25 ppm at 25 °C
Maintenance-free emergency clock backup
3 days
Type of receiver
8-channel phase tracking receiver
Evaluation
L1 frequency 1575.42 MHz, C/A code
Sensitivity
-143 dB
Synchronization time
•
Cold restart (initial installation without
position information)
•
Warm start (power down < 3 days)
•
30 min to 4 h
•
Approx. 1 min.
Temperature range
•
for specified data
•
with poorer free-run (accuracy) characteristics
•
0 to 50 °C
•
0 to 70 °C
