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Ultra Low Noise GNSS Locked and Atomic Frequency References for SATCOM

Multi-Channel Frequency References Simplifiy Complex Systems and Reduce Noise

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Satcom references typically require a very low noise, stable reference. The noise requirement stems from the fact that the link frequencies are so high that the 10 MHz has to be very low due to noise multiplication. The theoretical minimum for noise degradation is 20*log (fn/10 MHz). For a 14 GHz system this is over 60 dB of noise degradation. The application almost always requires a low phase noise OCXO. In addition to low noise, the narrow bandwidth requires that the frequency must extremely stable to avoid transmitting outside the center of the assigned channel. An OCXO, while a very low noise device, lacks the stability and must be slaved to either an atomic reference or the GPS. Another option is an OCXO disciplined to an atomic reference which is in turn disciplined to the GPS. The latter case of the GPS disciplined atomic reference typically enables lower phase noise as the Rubidium 10 MHZ is a low phase noise signal than a digitally derived waveform from the GPS. Another option is the FC7400-50MHz- a Ultra low noise 50 MHz source that is locked to the GPS.

Products:

 NR2110-O-G Single Channel Low Noise OCXO GPS Locked

 

NR2110 RUB

Single channel GPS locked OCXO, 10 MHz frequency reference with PPS. The unit features Auto-Calibration such that the most recent coefficients to compensate the OCXO for drift due to aging and/or temperature are stored and applied to the OCXO during GPS loss of lock conditions. High performance 26 channel GPS receiver that supports GPS, GLONASS, SBAS, QZSS. By being able to receive data from multiple satellite constellations lower lock time is achieved. With twice the number of satellites in view, as a GPS only configuration, achieving and maintaining lock in poor signal environments is enhanced.

 

 

NR2110-O-R-G Single Channel, Ultra Low Noise OCXO Disciplined to a GPS Locked Rubidium Reference

 

NR2110 RUBNR2110 R O G OC PN a

The primary signal source is from a 10 MHz GPS locked Rubidium reference. A Rubidium reference affords long-term aging of <2 ppb/year. The long-term stability is further enhanced with timing information from the GPS. Ultra low phase noise is achieved by locking a high performance OCXO to the Rubidium reference.  The best of three technologies - low noise from the OCXO, mid-term stability from the Rubidium and long-term stability from the GPS. The output is fault protected and monitored continuously.

 

 

 NR3620-CAL Single Channel Compact with PPS and RS232

 

NR3620

 

General purpose GPSDO. low noise OCXO based reference offers 10 MHz, NMEA and PPS. Status relays can be wired into an alarm panel to alert of a failed self-test condition or if the unit cannot achieve GPS lock. Wide power operating range includes -60 to +60 Vdc (in three ranges). Auto-Calibration feature stores the most current OCXO compensation coefficients. (see Youtube video- https://www.youtube.com/watch?v=uAXjvuEEgUg)

 

 NR6720- CAL 10 MHz plus Programabale Secondary Channel

 

NR6720

High performance 26 channel GPS receiver that supports GPS, GLONASS, SBAS, QZSS.Synthesized secondary channel can be programmed from 14 KHz to 10 MHz.  Ideal for applications requiring a second locked frequency (synchronous AM). Auto-Calibration feature stores the most current OCXO compensation coefficients. (see Youtube video- https://www.youtube.com/watch?v=uAXjvuEEgUg)

 

 NR3623 Three Channel OCXO GPS Locked Source

 

NR3623 angle

General purpose triple channel GPSDO. Low noise OCXO based reference offers 10 MHz, NMEA and PPS. Status relays can be wired into an alarm panel to alert of a failed self-test condition or if the unit cannot achieve GPS lock. Wide power operating range includes -60 to +60 Vdc (in three ranges). Auto-Calibration feature stores the most current OCXO compensation coefficients.

 

 

NR2306-OG Six Channel Ultra Low Noise Locked Reference

 

NR2110 OGP ang 2 er

Lock In Amplifer phase noise

Six channel GPSDO meets the synchronization needs for more complex systems. PPS and NMEA signals come standard. Large LCD display presents time and unit status. GPSDO features low noise OCXO and Auto-Calibration.

 

 

NR2310-O-G- Ten Channel Low Noise OCXO GPS Locked

 

NR2310xxx

10 Channel 1 ru GPS locked reference frequently eliminates the need for a distribution amplifier, saving rack space and cost. GPSDO features low noise OCXO and Auto-Calibration

 

 

 

 NR2310-R-O-G Ten channel, low noise OCXO Disciplined to a GPS Locked Rubidium Reference

 

 NR2310xxx

The phase noise for a standard Rubidium source is not acceptable for some applications. Our low noise Rubidium frequency reference incorporates a low noise OCXO that is locked to the Rubidium source. To achieve even greater long-term stability, the Rubidium reference is locked to the GPS.  This combination gives you the best of three technologies—the stability of Rubidium, the low noise of an OCXO and the long-term stability of GPS. Having ten channels frequently meets the needs of complex systems without a distribution amplifer in a single ru chassis.

 

 

 

 

FC7400- 50 MHz Ultra Low Noise Source GPS Locked

 

NC7400 fnt50 Mhz locked to 10 MHz

The primary signal source is from a 10 MHz GPS locked Rubidium reference. A Rubidium reference affords long-term aging of <2 ppb/year. The long-term stability is further enhanced with timing information from the GPS. Ultra low phase noise is achieved by locking a high performance OCXO to the Rubidium reference. You are basically getting the best of three technologies - low noise from the OCXO, mid-term stability from the Rubidium and long-term stability of the GPS. The output are fault protected and monitored continuously.