NFS-220 Plus - GPS Time and Frequency Standard with large display
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NFS220 PLUS Network Ready GPS Time and Frequency Standard NFS220 PLUS Networked Frequency Standard The NFS220 Plus is a precision time and frequency standard that uses the Global Positioning System (GPS). This unit is designed for use in WI-FI, Wi-Max, satellite communications, telecommunications and military communication applications. This GPS frequency standard utilizes a high performance 16 channel GPS receiver with a high visibility time of year display. An automatic position-averaging feature enables the best use of GPS when operating in a fixed location. The NFS220 Plus 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 The basic NFS220 Plus includes a precision OCXO frequency standard, while TCXO and Rubidium oscillators are also available to giving a variety of price and performance options. An option with a low noise OCXO phase locked to a rubidium is also available, combining the low noise characteristic with the OCXO with the long term stability of a rubidium. The NFS220 Plus provides “at a glance” status indication via front panel LED’s as well as a large time, day and year display. This unit can be integrated with other management systems using Ethernet and serial ports. The NFS220 Plus provides simple integration into military platforms by allowing synchronization from Have Quick time code, which is available on military SA-ASM GPS receivers such as the DAGR or PLGR. The NFS220 PLUS also generates Have Quick and 1PPS signals compatible with ICD-GPS-060. The integrated Ethernet interface provides Network Time Protocol (NTP) synchronization of other connected computers. In addition to NTP, the NFS220 Plus Ethernet interface contains a built in web server that allows the NFS220 PLUS to be controlled using a standard web browser such as Internet Explorer. Simple Network Management Protocol (SNMP) allows easy integration of the NFS220 PLUS with industry standard network management systems. The NFS220 Plus provides three 1PPS time mark outputs. A unique feature allows precisely controlled delays to be inserted into these outputs to compensate for cable and other propagation delays. Compensation delay is independent for each output and has <1ns resolution. FEATURES 16 Channel GPS Receiver or ICD-GPS060 Have Quick/1PPS input references High Visibility Time of Year Display Choice of Disciplined Oscillator High Stability Time and Frequency outputs. 1U 19” rack mount o Network Interface for remote management and NTP server Three 1PPS outputs with propagation delay compensation Mutiple time code outputs (IRIG B, A, E, G) Four 10 MHz Sinewave outputs Have Quick time code Advanced Oscillator Control Algorithm Serial time code outputs are provided to allow time synchronization to be distributed to computers, displays, and other equipment requiring precision time. Two outputs are dedicated to Have Quick time code. Two outputs (one modulated, one DC level shift) may be user selected from IRIG A, IRIG B, IRIG E, IRIG G. Four low phase noise 10 MHz sine wave outputs from the disciplined oscillator are provided. Signal amplitude is software settable. All outputs are provided with activity detectors. Loss of any output is indicated by means of a individual front panel alarm LED as well as through the network interface or a discrete alarm output.

NFS220 PLUS SPECIFICATIONS Satellite Signal Satellite Code Receiver Type GPS L1 1575.42 MHz C/A 1.023 MHz Parallel 16 Channel. All-inview satellites tracked continuously and simultaneously Warm Start <10 sec(Open Sky) Autonomous Start <60 seconds Cold Start (Open Sky) Cold Start Requirement Automatic: No input of time or position required Position Accuracy 2.4 m horizontal, 5 m altitude with respect to WGS84 after 24 hour position averaging Timing Accuracy 100 ns. absolute UTC (tracking satellites) Std Deviation 15ns (OCXO) Timing Accuracy < 15 sec/day (OCXO) (holdover mode, ± 5ºC) <1 sec...