11 Technical Appendix
Master Oscillator
OCXO-SQ (Oven Controlled Oscillator)
Accuracy compared to
IRIG-reference:
sync. and 20 min. of operation:
±
5E-9
first 20 min. after sync.:
±
1E-8
accuracy of oscillator:
holdover, 1 day:
±
1E-7
holdover, 1 year:
±
1E-6
short term stability:
≤
10 sec, synchronized:
±
2E-9
≤
10 sec, holdover:
±
5E-9
temperature dependant drift:
holdover:
±
1E-6
Frequency Synthesizer
Output frequency:
fixed - 2.048MHz
Accuracy:
like system accuracy
1/8 Hz to 10 kHz:
Phase synchronous to pulse per second
10 kHz to 10 MHz:
deviation of frequency < 0.0047 Hz
Synthesizer Outputs:
TTL into 50
Ω
sine wave 1.5 Vrms
output impedance 200
Ω
Pulse Outputs
Pulse per second (PPS):
TTL- and RS-232 level
positive pulse, pulse duration 200 msec
Pulse per minute (PPM):
TTL level
positive pulse, pulse duration 200 msec
Pin Assignment of the DSUB9 Connectors (male):
Pin 2: RxD
Pin 3: TxD
Pin 5: GND
Synchronization with PPS + string:
Pin 1: PPS
Signal level: TTL
Pulse length:
≥
5
µ
s (active high)
Pin 2: String
The following timestrings (time telegrams) can be used:
- NMEA RMC
- NMEA ZDA
- Meinberg Standard
- Uni Erlangen
COM
IMS - LANTIME M4000
Date: 27th May 2021
79
