Catalog

10 Channel GNSS Locked Frequency Reference with Dual-Time Base

NR2310D-O/G-Dual

Ten channel reference offers GNSS-locked stability with a completely independent integrated gap-less frequency counter to assure the integrity of the primary reference. Ten channels meet the needs of most applications without a distribution amplifier.  Continuous channel monitoring available locally or via RS232/Ethernet (SNMP). Dual power source options for AC and DC power driven systems. Dual-time base option adds integrity to your time base.

• Ten transient and fault protected channels with fault indicators on the front panel.
• Dual-time base option – internal gap-less embedded frequency counter continuously monitors the reference with its own indepenedent GNSS based reference.
• Option – operates from AC or DC power sources independently or redundantly.
• Monitor and set alert limits on each output.
• Two-stage amplifier design isolates the source from the amplifier outputs, thereby protecting the source.
• SNMP provides remote monitoring and control
• Available with either BNC or SMA output connectors
• Available with 10 MHz Square CMOS outputs.

10 Channel GPS/GNSS Locked 10 MHz Frequency Reference

NR2310-O/G

A solid, low cost 10 channel platform. Embedded 26 channel GNSS receiver locks and stays locked in weak signal environments. Transient and fault protected channels designed for the a high level electromagnetic environment to provide years of reliable service.  AC and DC power options available for critical installation.

•10 channel 10 MHz reference with built-in GNSS receiver. 

•10 channel GNSS locked OCXO 10 MHz frequency reference.

•Low phase noise OCXO –  125dBc/Hz at 100 Hz.

•OCXO daily aging <+-5 ppb/day.

•Locked accuracy <3E-11.

•10 channels very often eliminate the need for a distribution amplifier.

•Harmonics are well below -30dB.

•Chassis is 1 RU (~1.7 inches) and saves valuable rack space.

•All inputs and outputs are transient protected.

•Built-in test.

•Status relay connected to a rear panel connector that opens if a system failure occurs.

•Unit features auto-calibration to compensate for long-term drift.

Also available with 10 MHz Square CMOS outputs

•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. Maintaining lock in poor signal environments is enhanced.

Optional Networking and SNMP available (see NR2310D-O/G).

10 Channel 10 MHz Frequency Reference with Local and Remote Monitoring

NR2310D-O

Ten channel reference offers the stability of a SC cut OCXO stabilzed with a band gap reference. Local display and controls allow channel by channel status. RS232 and Ethernet capability enable romote monitoring and control (SNMP). Ten channels meet the needs of most applications without a distribution amplifier. Dual power source options for AC and DC power driven systems.

• Ten transient and fault protected channels.
• Option – operates from AC or DC power sources independently or redundantly.
• Monitor and set alert limits on each output.
• Two-stage amplifier design isolates the source from the amplifier outputs, thereby protecting the source.
• SNMP provides remote monitoring and control
• Also available with 10 MHz square CMOS outputs.

10 MHz GNSS-Locked OCXO Based Frequency Reference PCB Assembly
– Digital Control Loop Enables Low Jitter PPS and Low Close in Phase Noise

NR4430-O/G

Compact GNSS-locked reference designed to be easily integrated into your system to provide precision 10 MHz, PPS and NMEA for master timing. The unit features a 26 channel high-sensitivity, high-accuracy multi-GNSS receiver. Supports TRAIM, GPS, GLONASS, QZSS, SBAS, Active Anti-Jamming and Advanced Multi-path Mitigation functions. Digital control loop provides low close-in phase noise and pulse-t0-pulse jitter on the PPS of less than 1 ns. Auto-calibration stores the most recent compensation coefficients – dramatically minimizing long-term drift. Single 5 Vdc power supply simplifies system integration. Status signals alert the system to BIT failures or loss of GNSS signal. See the attached white paper on GNSS reference design notes.

• Simple integration requires only a single 5 Vdc power supply.
• NMEA at full RS232 levels (logic levels available option)
• Status signals alert of a long-term GNSS loss.
• Low phase noise.
• PPS p-p jitter < 1 ns.

Specifications:

Typical Phase Noise

Offset                   Phase Noise (dBc/Hz)
1 Hz                        -95

10 Hz                     -120

100 Hz                  -150

1kHz                      -152

10 MHz GNSS-Locked TCXO Based Frequency Reference PCB Assembly – PPS, NMEA with Auto-Calibration – Low Cost TCXO

NR4400-T

Compact TCXO based GNSS-locked reference designed to be easily integrated into your system to provide precision 10 MHz, PPS and NMEA for master timing. The unit features a 26 channel high-sensitivity, high-accuracy multi-GNSS receiver. Supports TRAIM, GPS, GLONASS, QZSS, SBAS, Active Anti-Jamming and Advanced Multi-path Mitigation functions. Auto-calibration stores the most recent compensation coefficients – dramatically minimizing long-term drift. Single 5 Vdc power supply for convenient system integration. Status signals alert the system to BIT failures or loss of GNSS signal. A low cost alternative to an OCXO based reference for less demanding phase noise applications.

• 26 channel GNSS receiver.
• Simple integration requires only a single 5 Vdc power supply.
• NMEA at full RS232 levels (logic levels available option)
• Status signals alert of a long-term GNSS loss.
• Low phase noise.
• Frequencies to 100 MHz available.
• Power consumption < 1 Watt.

Specifications:

Typical Phase Noise

Offset                   Phase Noise (dBc/Hz)
1 Hz                        -50

10 Hz                      -100

100 Hz                   -120

1kHz                      -140

10 MHz Low Close-In Phase Noise with Stabilized PPS

NR6720-O/G/A6

The NR6720-O/G/A6 features extremely low frequency jitter despite being GNSS-locked. GNSS-locking brings a long-term stability to an OCXO that is difficult to match. Instead of an accuracy of 50 ppb/year – accuracies of ~E-12 are readily achieved. However, locking an OCXO to the GNSS presents its own set of problems. The timing information from the GNSS is burdened with all the noise one would expect from a RF link – multi-path, reflections, etc. Long-term stability is enhanced frequently at the expense of “close-in” stability. Low frequency components from the RF link are introduced to the OCXO, often degrading the Allan Deviation of the OCXO. The NR6720-O/G/A6 uses a unique crystal and proprietary control loop to minimize “close-in” degradation while securing long-term stability. The unit also features very low PPS pulse-to- pulse jitter. Instead of the +- 10 ns of PPS jitter from the receiver, the PPS stabilizer reduces PPS jitter to under 800 ps.

• Holdover stability of 5 ppb/day,  50ppb/year.
• LVDS port available for either PPS or 10 MHz
• PPS stability option- P-P jitter < 800 ps.
• Locked accuracy <4E-11.
• Available -60 to +60 Vdc in three ranges or AC power adapter
• Concurrent reception of GPS and GLONASS.
• PPS accuracy 15 ns @ 1 sigma
• Secondary channel synthesized frequency.
• Indicators and signals provide GPS/GNSS lock and unit self-test status.
• NMEA available via RS232 port.
• PPS CMOS port can drive 50 Ohm

Typical Phase Noise

PC104 Six Channel 10 MHz GNSS Locked Frequency Reference with PPS and NMEA

NR4600-O/G

Six independent 13 dBm sine outputs that are fault and transient protected and individually monitored. Channel status available over RS232 port. NMEA -0183 port at full RS232 levels or 3.3 Vdc logic. PPS at 3.3 Vdc  Only a single voltage power source required. The unit also features auto-calibration that compensates for long-term crystal drift to provide years of precise performance. There is also a GPS lock status signal, PPS and serial port to provide access to NMEA  and equipment status.

• 26 channel high-sensitivity, high-accuracy multi-GNSS receiver. Supports TRAIM, GPS, GLONASS, QZSS, SBAS, Active Anti-Jamming and Advanced Multi-path Mitigation functions.
• PC104 compliant mechanical design.
• Operates from -60 to +60 Vdc power in three ranges.
• Auto-calibration minimizes long-term drift.

Specifications:

Typical Phase Noise

Offset                   Phase Noise (dBc/Hz)
1 Hz                        -90

10 Hz                      -130

100 Hz                   -150

1kHz                       -152

Dual Channel GNSS Locked OCXO 10 MHz Frequency Reference with Networking/Dual-Time Base Option

NR2110D-O/G

Dual channel GNSS-locked OCXO, 10 MHz frequency reference with PPS and Ethernet connectivity. The unit features auto-calibration so 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 GNSS receiver that supports GPS, GLONASS, SBAS, QZSS. By being able to receive data from multiple satellite constellations, lower lock time is achieved. Front panel display and Ethernet port allows remote status reporting. Dual time base option adds a completely independent GNSS receiver and gapless counter to monitor the 10 MHz reference- warns of a reference out of tolerance condition.

• OCXO holdover.
• OCXO holdover stability 5 ppb/day – 50 ppb/ year.
• Auto-Calibration continually preserves OCXO GNSS derived compensation coefficients.
• Outputs are transient and fault protected.
• Fault status drives a front panel LED..
• Low phase noise  -145dBc/Hz @ 1 kHz.
• Locked accuracy <1E-11.
• Front panel status indicators for channel faults, antenna fault or open, oven and unit alert.
• Front panel LCD status display.
• Dual-time base option continually monitors the primary reference.
• Ethernet connectivity.
  
• AC/DC power capability.
• Optional NTP time server.

Dual Channel OCXO 10 MHz Frequency Reference 

NR2110-O

Dual channel,10 MHz frequency reference.

• OCXO holdover.
• OCXO holdover stability 5 ppb/day – 50 ppb/ year.
• Outputs are transient and fault protected.
• Fault status drives a front panel LED..
• Low phase noise  -145dBc/Hz @ 1 kHz.
• Front panel status indicators for channel faults, oven and unit alert.
• AC/DC power capability.

10 MHz, GNSS Locked, TCXO Frequency Reference

NR6720-T/G

Compact TCXO based GNSS-locked reference designed to be easily integrated into your system to provide precision 10 MHz, PPS and NMEA for master timing. The unit features a 26 channel high-sensitivity, high-accuracy multi-GNSS receiver. Supports TRAIM, GPS, GLONASS, QZSS, SBAS, Active Anti-Jamming and Advanced Multi-path Mitigation functions. Auto-calibration stores the most recent compensation coefficients – dramatically minimizing long-term drift. Single 5 Vdc power supply for convenient system integration. Status signals alert the system to BIT failures or loss of GNSS signal. A low cost alternative to an OCXO based reference for less demanding phase noise applications.

• 26 channel GNSS receiver.
• NMEA at full RS232 levels
• Status signals alert of a long-term GNSS loss.
• Low phase noise.
• Frequencies to 100 MHz available.
• Power consumption < 1 Watt.
• Available -60 to +60 Vdc in three ranges.

Specifications:

Typical Phase Noise

Offset                   Phase Noise (dBc/Hz)
1 Hz                        -50

10 Hz                      -100

100 Hz                   -120

1kHz                      -140

GNSS Locked OCXO Based 50 MHz Frequency Reference

NR7400-50

GNSS-locked OCXO, 50 MHz frequency reference.The unit features auto-calibration so 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 GNSS receiver that supports GPS, GLONASS, SBAS, QZSS. By being able to receive data from multiple satellite constellations, lower lock time is achieved. Unit is also capable of locking to an external 10 MHz reference. Low phase design results in a reference ideally suited to high frequency applications -ie satellite up links- where the higher operating frequency affords a 14 dB reduction in phase noise versus a 10 MHz reference.

• OCXO holdover.
• OCXO holdover stability 5 ppb/day – 50 ppb/ year.
• Auto-Calibration continually preserves OCXO GNSS derived compensation coefficients.
• Outputs are transient and fault protected.
• Fault status drives a front panel LED..
• Locked accuracy <3E-11.
• Front panel status indicators for channel faults, antenna fault or open, oven and unit alert.
  
• AC/DC power capability.

Single Channel, 10 MHz GNSS-Locked OCXO based Frequency Reference PCB Assembly – PPS, NMEA with Auto-Calibration

NR4400-O/G

Compact GNSS-locked reference designed to be easily integrated into your system to provide precision 10 MHz, PPS and NMEA for master timing. The unit features a 26 channel high-sensitivity, high-accuracy multi-GNSS receiver. Supports TRAIM, GPS, GLONASS, QZSS, SBAS, Active Anti-Jamming and Advanced Multi-path Mitigation functions. Auto-calibration stores the most recent compensation coefficients dramatically minimizing long-term drift. Single 5 Vdc power supply simplifies system integration. Status signals alert the system to BIT failures or loss of GNSS signal.

• 26 channel GNSS receiver.
• Simple integration requires only a single 5 Vdc power supply.
• NMEA at full RS232 levels (logic levels –  available option).
• Status signals alert of a long-term GNSS loss.
• Low phase noise.

Specifications:

Typical Phase Noise

Offset                   Phase Noise (dBc/Hz)
1 Hz                        -95

10 Hz                     -120

100 Hz                  -150

1kHz                      -152

10 MHz Low Noise OCXO, PPS Locked Frequency Reference

NR6720-PPS

The NR6720-PPS locks a low noise OCXO to an external PPS signal,  The unit features auto-calibration so 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/GNSS loss of lock conditions. The unit operates from a nominal 12 Vdc power source or available AC power adapter. Unit can be configured to operate from -60 to +60 Vdc in three ranges.

• Holdover stability of 5 ppb/day,  50ppb/year.
• PPS stability option- P-P jitter < 700 ps.
• Locked accuracy <4E-11.
• Available -60 to +60 Vdc in 3 ranges.
• Indicators and signals provide GPS/GNSS lock and unit self-test status.

Single Channel 10 MHz Frequency Reference, OCXO Based

NR3700-O

The NR3700 reference uses a low noise SC cut OCXO as the master timing source. The OCXO is biased with a band-gap reference to provide excellent temperature and and aging stability.  LED indicator provides self-test status. There is also a floating solid state relay that can be tied to an alarm panel self test status.

The NR3700 contains a factory programmable counter. The OCXO is typically 10 MHz and is firstly tripled to 30 MHz. The 30 MHz signal drives a 16 bit match counter enabling a the synthesis of a range of frequencies that are integer divides of the 30 MHz The output is available on the SMA as a CMOS signal at 5 Vdc or 3.3 Vdc  CMOS capable of driving a 50 ohm load.

The unit also has a LVDS option.

• Low phase noise OCXO
• Hold-Over stability of 5 ppb/day, 50ppb/year
• Operates from DC Power in three ranges +- (10 to 18, 18 to 36, 36 to 65) VDC or an AC Adapter

• Indicators and signals provide self-test status
• Internal 16 bit Match counter drives CMOS and/LVDS

Single Channel 10 MHz Frequency Reference, OCXO Based with LVDS

NR3702-O

The NR3702 reference uses a low noise SC cut OCXO as the master timing source. The OCXO is biased with a band-gap reference to provide excellent temperature and and aging stability.  LED indicator provides self-test status. There is also a floating solid state relay that can be tied to an alarm panel self test status. The unit provides a 10 MHz sine, a PPS pulse at either 3.3 or 5 Vdc CMOS levels and a LVDS port that can be configured to the 10 MHz or PPS output.

• Low phase noise OCXO
• Hold-Over stability of 5 ppb/day, 50ppb/year
• Operates from DC Power in three ranges +- (10 to 18, 18 to 36, 36 to 65) VDC or an AC Adapter

• Indicators and signals provide self-test status
• LVDS port

Single Channel GPS/GNSS Locked 10 MHz Frequency Reference, OCXO and Self-Calibrating with PPS and NMEA

NR3620-O/G

The NR3620-O/G frequency reference continuously monitors the correction coefficients being applied to the OCXO to compensate for aging and temperature stability. The coefficients are stored in non-volatile memory and in the event of GPS loss, are used to maintain the accuracy of the crystal – GPS loss. PPS available at 3.3 or 5 Vdc CMOS levels capable of driving a 50 Ohm load.   A good choice for general lab use, Simulcast and test systems.

• GNSS lock indicator and built in self test.

• Holdover stability of 5 ppb/day, 50ppb/year.

• Self-calibration minimizes frequency transition during GNSS lock to < 10ppb.

• Locked accuracy < 4E-11.

• Operates from DC Power in three ranges +- (10 to 18, 18 to 36, 36 to 65) Vdc or an AC adapter.

• PPS Accuracy 20 ns rms.

• Indicators and signals provide GPS lock and unit self-test status.

• Available in kit form (Includes reference, antenna, 50′ cable, and power adapter).

GPSDO Kit available, wide input power range (-60 to +60 Vdc)

Need more channels- see the 3 channel NR3623-OG or the 10 channel NR2310D-OG

See demo video on YOUTUBE (NR3620)