NFG-1 GPS Frequency Standard 1PPS ■ ■ ■ ■ ■ ■ ■ ■ Features: ✦ High-performance GPS 1 PPS source with multiple outputs ✦ 1 PPS holdover circuit for GPS reception loss ✦ Built-in GPS-disciplined frequency standard ✦ 10 MHz reference output Applications: ✦ Substitution of several GPS receivers at the same location ✦ GPS-disciplined frequency standard for test and measurement ✦ 1 PPS source for telecommunications and broadcasting ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ VAD
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Mar 24, 2016
http://www.pressebox.de/attachment/163658/ds-nfg_1-en.web.pdf
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NFG-1GPS Frequency Standard 1PPS
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Features:
F High-performance GPS 1 PPS source with multiple outputs
F 1 PPS holdover circuit for GPS reception loss
F Built-in GPS-disciplined frequency standard
F 10MHz reference output
Applications:
F Substitution of several GPS receivers at the same location
F GPS-disciplined frequency standard for test and measurement
F 1 PPS source for telecommunications and broadcasting
n n n n n n n n n n n n n n n n n n n n n n n n n n n nVAD
VAD Video-Audio-Design GmbH DresdenLaerchenstrasse 7 F 01097 Dresden F Germanyphone: +49 351 811 98 30 F fax: +49 351 811 98 54www.vadgmbh.de F e-mail: [email protected]
Description
The frequency standard NFG-1 provides up to seven 1PPS signals which are generated by a built-in GPS receiverand a GPS-disciplined frequency standard. A holdover circuit ensures high stability of the 1 PPS and 10MHz signalin case of GPS reception loss.
Front view of the NFG-1
One 1PPS BNC output is provided at the front panel. The LEDs signalize the quality of GPS reception and thestate of the frequency standard.
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Rear view of the NFG-1
The GPS antenna input with switchable bias voltage for active antennas is fed through to a GPS antenna output forother GPS devices located at the same site. The six SUB-D 9 connectors fitted at the rear side, provide the 1 PPSsignal (CMOS logic level) and GPS NMEA Sentences (RS232) for external equipment.
Specifications
Technical specifications
Interfaces on the frontUSB configuration and visualisation of the GPS receiver status1 PPS output BNCLEDs status display
Interfaces on the rear sideInput for active/passive GPS Antenna 50Ω, SMABias voltage for active GPS antenna at SMA center conductorGPS antenna bias voltage switch off/+3VDC/+5VDC
GPS antenna feed trough output 50Ω SMA, 0 dB lossGPS NMEA / 1PPS output 6 × SUB-D 9 pin10 MHz output BNCPower supply IEC power connector with integrated fuse holder
1PPS outputOutput level CMOS 0− 5VDC
Current ±20mA sink/sourceTime stability < 50 ns (locked)Holdover time stability < ±4 µs/6 h within a 20 temperature window
GPS NMEA outputInterface RS-232, 9600Bd 8N1NMEA Sentences GPRMC, GPGSV, GPGGA
10MHz output
Frequency 10MHz
Frequency stability 10−12, typical
Holdover frequency stability < 10−10/24 h
Level 0.5 VRMS 50Ω
Signal shape sine wave
Phase noise −120 dBc @ 10Hz
Conformance ANSI T1.101, Stratum 1/2/TNC/3E, GR-1244, ITU-TG.811/G.812, PRC, Type I/II/III/V, CDMA IS-95, UMTS 3GPPS25.104
Power supply
Operating voltage 200–240VAC, 50Hz
Power consumption < 20W
General specifications
Dimensions 440mm× 180mm× 43.6mm (B × T ×H); 19′′, 1 U size
Operating temperature 0 to +45
Weight about 2 kg
Ordering information
NFG1 GPS frequency standard incl. user manual
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