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The NFS-220 is a low cost precision time and frequency standard that uses GPS for use in WI-FI, Wi-Max, satellite communications, telecommunications, and military communications. This frequency standard is the newest of Brandywine's GPS Synchronizing clocks and utilizes a high performance 16 channel receiver with automatic position-averaging that enables the best use of GPS when operating in a fixed location. The NFS220 includes 4 low phase noise 10MHz outputs, 4 1PPS outputs with individual 600PS propagation delay compensation, IRIG, Have Quick, and NTP outputs.
Advanced Network-Ready Time and Frequency Standard
The NFS-220 from Brandywine Communications is the most advanced network-ready time and frequency standard product available using Global Positioning System (GPS).Below are some of the great features of this new product:
- High performance GPS disciplined Time/Frequency standard
- Ethernet Interface for management and control
- Network Time Protocol (NTP)
- Multiple 1PPS outputs with individual delay compensation
- Multiple Low Phase Noise 10MHz outputs with software programmable level
- Time Code outputs including Have Quick, IRIG A, IRIG B, IRIG E, IRIG G
- Sync to GPS or to Have Quick/1PPS per ICD-GPS-060
- Choice of internal disciplined TCXO, OCXO or Rubidium Oscillator
The NFS220 is fitted with an internal back up oscillator that is continuously calibrated to GPS using an advanced algorithm, providing optimal frequency control of the oscillator. This ensures that the highest time and frequency accuracy is maintained if no satellites can be tracked, and ensures an ultra stable, low noise frequency reference.
| NFS220 Specifications |
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| Satellite Signal |
GPS L1, 1575.42 MHz |
| Satellite Code |
C/A 1.023 MHz |
| Receiver Type |
Parallel 16 Channel. All-in view satellites tracked continuously and simultaneously |
| Warm Start |
<10 sec (Open Sky) |
| Autonomous Start |
<60 sec Cold Start (Open Sky) |
| Cold Start Requirements |
Automatic: No input of time or position required |
| Position Accuracy |
2.4 m horizontal, 5 m altitued with respect to WGS84 after 24 hour position averaging |
| Timing Accuracy (Tracking Satellites) |
+/- 100ns. Absolute UTC Std. Deviation 15ns (OCXO) |
| Timing Accuracy (Holdover mode, +/- 5°C) |
<15 µsec/day (Rb2) |
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| 1PPS Output |
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| Connector |
BNC (2) DB9 (1) |
| Level |
0-5V or 0-10V into 50Ω link selectable by user |
| On Time |
Rising Edge |
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| Network Interface |
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| Interface Type |
10BaseT |
| Protocols |
TCP/IP, UDP, NTPv3, HTTP, SNMP v1 |
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| Serial Interface |
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| Type |
RS232 and RS422 |
| Baud Rate |
9600,N,8,1 |
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| Sine Wave Outputs |
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| No. of Outputs |
4 |
| Connector |
BNC |
| Frequency |
10MHz |
| Level |
0 -13dBm into 50 ohm Software Settable |
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| Time Code 1 Output |
(Modulated) |
| Connector |
BNC |
| Code Type |
IRIG A135, B125, E115, G145 software selected |
| Control Functions |
IEEE 1344 |
| Level |
3 V p-p into 600 ohm (DCLS) |
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| Time Code 2 Output |
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| Connector |
DB9 |
| Code Type |
IRIG A005, B005, E005, G005 |
| Selection |
same as modulated code |
| Levels |
DC level shift (0-5V) |
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| Time Code 3,4 Output |
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| Connector |
BNC (1) DB9 (1) |
| Code Type |
Have Quick per ICD-GPS-060 |
| Levels |
0-5V |
| Alarm Status |
Voltage free relay |
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| Status Indicator LED's |
Power |
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Tracking Satellites |
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Valid Time |
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Holdover/ 12hr Holdover alarm |
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Output Good/Fail (8 leds) |
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| Environmental |
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| Temperature |
Instrument: -10 to +50°C |
| Humidity |
95% non condensing |
| Power |
85-265VAC 50/60Hz |
| Optional |
12VDC, 24VDC, -48VDC, 125VDC |
| Dimensions |
19" rack mount |
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1.75" (1U) height, 7.5" depth, 17" width, 3.5lb Nom. |
| Weight |
11lb typical |
| EMC Emmission |
To EN55022 as EN50024 FCC Part 15B, Class A |
| EMC Immunity |
To EN50082-1 as EN61000-4-2 ESD, IEC 801-3 HF Field, IEC 801-4 Burst |
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NFS 220