10 Channel GNSS GPS Disciplined Oscillator 10MHz Frequency Reference with Dual-Time Base Option NR2310D-O/G-Dual Time Base

Dual Time Base Assures Your Frequency Reference

Ten channel  10 MHz frequency reference offers GNSS GPS 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 GPS DO 10 MHz channels with fault indicators on the front panel.
• Dual-time base option – internal gap-less embedded frequency counter continuously monitors the 10 MHz reference with its own independent GNSS GPS 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 option provides remote monitoring and control
• Available with either BNC or SMA output connectors
• Available with CMOS outputs (3.3 or 5 Volt) capable of driving a 50 Ohm load.

10MHz Low Close-In Phase Noise with Stabilized 1PPS

NR6720-O/G/A6

Locked Synthesized 1PPS has <1ns Jitter

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 1PPS 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 1PPS 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
• 10MHz transient and fault protected

Typical Phase Noise

100MHz Frequency Reference, Self-Calibrating, Single Channel GNSS GPS Disciplined, OCXO NR3620-100

GNSS Locked  100 MHz Frequency Reference

The NR3620-100 100 MHz frequency reference locks a low phase noise OCXO to the GNSS.  Controller 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 offset +- 10 ppb. NMEA and 1PPS outputs available.

• Low phase noise OCXO.
• GNSS GPS lock indicator and built-in self test.
• Holdover stability of 7 ppb/day.
• Self-calibration minimizes frequency transition during GNSS lock to < 10ppb.
• Locked accuracy < 4E-11.

See demo video on YOUTUBE (NR3620)

• Operates from DC power in three ranges +- (10 to 18, 18 to 36, 36 to 65) Vdc or an AC adapter.
• 1PPS accuracy 15 ns 1 sigma.
• Indicators and signals provide GNSS GPS lock and unit self-test status.
• Available in kit form (includes reference, active antenna, 50′ cable, and power adapter).

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

PC104 Six Channel 10MHz GNSS GPS Disciplined Oscillator with 1PPS and NMEA NR4600-O/G

Compact Six Channel Frequency Reference

Six independent 13 dBm 10MHz 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 GNSS GPS lock status signal, 1PPS 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.
• GPS DO with active antenna

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 10MHz Frequency Reference with Networking/Dual-Time Base Option NR2110D-O/G

10 MHz Frequency Reference with Dual Time Base

Dual channel GNSS GPS locked OCXO, 10MHz frequency reference with 1PPS 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 GNSS 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 optional 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  -150 dBc/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.
• HS3 Stability option provides real-time Allan Deviation
• Optional NTP time server.
• PL-option locks the PPS to the 10 MHz sine in 5 ns steps and reduces pulse to pulse jitter
• Available with either BNC or SMA output connectors
• GPS DO kit with active antenna

GNSS Locked OCXO Based 50 MHz Frequency Reference

NR7400-50

GNSS Disciplined 50MHz  Frequency Reference also Offers External Locking to PPS or 10 MHz

GNSS GPS Disciplained OCXO based, 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 -i.e. satellite up links- where the higher operating frequency affords a 14 dB reduction in phase noise versus a 10 MHz reference. The unit may also be locked to an external 10 MHz reference or PPS source. It may also be stabilized to an internal Rubidium 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.
• Various stability options available- see additional info tab

Portable 10 MHz OCXO or Rubidium based GNSS GPS Disciplined Frequency Reference-NT9400-O/G

Bring Precise Timing to Where it is Needed

GNSS GPS locked 10 MHz OCXO based frequency reference locked to a 26 channel multi-satellite system receiver, provides for fast lock under weak signal conditions. Unit produces 10 MHz, 1PPS, NMEA and a synthesized secondary channel that can range from 14 kHz to 10MHz. Optional NTP Time server.  Auto-calibration maintains output stability in an intermittent GPS environment. Battery provides for in excess of four hours of use. The NR9400 can be powered from an external 12 Vdc source. Event inputs record to 100 ns resolution. Rubidium holdover option available.

• Battery life in excess of four hrs.
• 1PPS signal output.
• 26 channel high-sensitivity, multi-GNSS receiver. supports TRAIM and various position modes, allowing it to output accurate and robust 1 PPS synchronized to UTC time.
• Supports GPS, GLONASS, QZSS, SBAS, Active Anti-Jamming and Advanced Multi-path Mitigation functions.
  
• 10 MHz harmonic distortion <-30dBc.
• Optional synthesized secondary channel that can range from 14 kHz to 10 MHz.
  
• Optional NTP time server.
  
• Optional Internet connectivity.
• Event input records to 100 ns resolution.
• Holdover drift < 1 ms/day OCXO, 20 usec/day with Rubidium option
• IRIG B.
• Available with Rubidium reference for extended holdover performance.

10 MHz Low Noise OCXO Disciplined to a 1PPS Source

NR6720-PPS

Modular 1PPS Disciplined Frequency Reference

The NR6720-PPS locks a low noise OCXO to an external 1PPS signal. The 1PPS signal can be 3.3 or 5 Volt CMOS.  The disciplined oscillator 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 GNSS GPS 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 GNSS GPS Disciplined 10MHz Frequency Reference, OCXO and Self-Calibrating with 1PPS and NMEA

NR3620-O/G

Ideal General Purpose 10 MHz Frequency Reference-Lab and Telcom

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 GNSS GPS loss, are used to maintain the accuracy of the crystal .  1PPS 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 GPS lock indicator and built in self test.

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

• Locked accuracy E-12.

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

• 1PPS 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).

GPS DO 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)

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

NR3700-OG

The NR3700-OG 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 – GNSS loss. A low cost alternative if NMEA and PPS are not needed.  A good choice for General Lab Use, Simulcast and Test Systems. Low noise option offers lower phase noise.

• Low phase noise OCXO
• GNSS lock indicator and built in self test
• Hold-Over stability of 5 ppb/day, 50ppb/year
• Self-Calibration minimizes frequency transition during GNSS lock to < 10ppb
• Locked accuracy < 4E-11

See demo video on YOUTUBE (NR3620)

• Operates from DC Power in three ranges +- (10 to 18, 18 to 36, 36 to 65) VDC or an AC Adapter
• PPS and RS232 available as options
• Indicators and signals provide GPS Lock and unity 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 THAN 1 OUTPUT?  See the NR3623-CAL

Single Channel GPS/GNSS Locked 10 MHz Frequency Reference, TCXO and Self-Calibrating

NR3700-TG

TCXO Based 10MHz GNSS Locked Frequency Reference

The NR3700-TG GNSS GPS disciplined frequency reference continuously monitors the correction coefficients being applied to the TCXO to compensate for aging and temperature stability. The coefficients are stored in non-volatile memory and in the event of GNSS loss, are used to maintain the accuracy of the crystal – GNSS loss. A low cost alternative if NMEA and PPS are not needed.  For lower phase noise see the OCXO based NR3700-OG.

• Low cost TCXO
• GNSS lock indicator and built in self test
• Hold-Over stability of  +-1 ppm/year
• Self-Calibration minimizes frequency transition
• Locked accuracy < 4E-11

See demo video on YOUTUBE (NR3620)

• Operates from DC Power in three ranges +- (10 to 18, 18 to 36, 36 to 65) VDC or an AC Adapter
• 1PPS Accuracy 20 ns rms
• Indicators and signals provide GNSS GPS Lock and unit self-test status
• Available in GPS DO Kit Form (Includes reference, active antenna, 50′ cable, and power adapter)

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

NEED MORE THAN 1 OUTPUT?  See the NR3623-CAL

Six Channel 10 MHz GNSS GPS Disciplined Oscillator Frequency Reference with External Synchronization –

NR3626-OG

Six Channel Frequency Reference Locks to GNSS or External 1PPS or 10 MHz

The NR3626 is a high-performance 10MHz frequency reference that is driven by a low phase noise SC cut OCXO disciplined by a 26 channel GNSS receiver. The 10MHz outputs are 13 dBm while the 1PPS outputs can be 5 or 3.3 Volt logic levels with the capability of driving a 50 Ohm load. In addition to the built in GNSS GPS receiver, there are an external 10 MHz and external 1PPS input that can be used to discipline the reference. The priority for each disciplining signal is software settable between the three signal sources.

• Low phase noise OCXO.
• Six channels
  
• Low close-in phase noise..
• PPS drives loads including 50 Ohms.
• GNSS GPS lock indicator and built-in self-test.
• Holdover stability of 5 ppb/day, 50ppb/year.
• Self-calibration minimizes frequency transition during GNSS-lock.
• Locked accuracy < E-11.
• Operates from DC power in three ranges +- (10 to 18, 18 to 36, 36 to 65) Vdc or an AC adapter.
• 1PPS Accuracy 25 ns rms. 
• Indicators and signals provide GNSS GPS lock and unit self-test status.
• Also available in a 19 inch rack chassis
• GPS DO

Three Channel GNSS GPS Disciplined 10 MHz Frequency Reference, OCXO and Self-Calibrating with 1PPS and NMEA

NR3623-OG

Low Noise Multi-Channel Locked 10 MHz Frequency Reference

The NR3623 GNSS GPS disciplined 10 MHz frequency reference continuously monitors the frequency of the low noise OCXO and disciplines as required. The coefficients are stored in non-volatile memory and in the event of GNSS loss, are used to maintain the accuracy of the crystal. The unit also provides NMEA data and the 1PPS pulse. PPS amplitude can be either 3.3 or 5 Vdc CMOS (3.3 Volts is standard) with the capability of driving a 50 Ohm load. LED indicators provide GNSS GPS lock status, channel fault and self-test status. There is also a floating solid state relay that can be tied to an alarm panel with lock and self test status.  A good choice for General Lab Use, Simulcast and Test Systems. Low phase noise options.

• Low phase noise OCXO
• GNSS  GPS lock indicator and built in self test
• Hold-Over stability of 5 ppb/day, 50ppb/year
• Self-Calibration minimizes frequency transition during GNSS lock to < 10ppb
• Locked accuracy < 4E-11
• 1PPS output
• NMEA RS232

See demo video on YOUTUBE (NR3620)

• 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 unity 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)

Three Channel 10 MHz GNSS GPS Disciplined Oscillator with Display

Compact Low Cost Frequency Reference Solution

NR8403-O/G
The NR8403 in a versatile modular package bringing GPS DO stability to almost any location. Wide power operating range with GNSS-locking to further enhance long-term stability. The low phase noise option adds an ultra-low phase noise OCXO. Phase noise < 155 dBc/Hz at 10kHz.  Unit may also be locked to an external 10MHz or 1PPS.  Popular in scientific, calibration labs and satellite up-links.

• Harmonics <40 dBc
• Excellent holdover stability < +-5 ppb/day
• GPS disciplined oscillator
• Low phase noise options
• Outputs are fault protected and monitored continuously
• Built-in test circuitry throughout the design
• Available with and without display
• 10 MHz and 50 MHz available
• 1PPS

Need more channels? See the 6 channel NR3626-OG or the NR2310D-OG 10 channel reference

16 Channel GNSS GPS Disciplined 10 MHz Frequency Reference

NR2316D-OG

16 Channel, Low Phase Noise, 10 MHz GNSS Locked Reference

A solid, 16 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.  Stability options offer thermal and vibration isolation. See additional info tab

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

•16 channel GNSS locked OCXO 10MHz frequency reference.

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

•OCXO daily aging <+-5 ppb/day.

•Locked accuracy <3E-11.

•16 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.

•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 (for a 10 channel platform see NR2310D-O/G )

GNSS Disciplined Oscillator Featuring Three 10 MHz Sine and Three 1PPS with LVDS

NR3606-OG

Multi-Channel 1PPS and 10 MHz Sine in a Compact Chassis plus LVDS

Unique in the industry, the NR3606 provides three 10 MHz sine outputs and three 1PPS outputs. It also provides a 10 MHz LVDS and 1PPS LVDS output. Ideally suited for applications requiring the stability of a locked frequency reference and the synchronization of a PPS. The 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 GNSS 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 15 ns 1 sigma

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

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

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

Need more channels- see the 6 channel NR3626-OG or the 10 channel NR2310D-OG

See demo video on YOUTUBE (NR3620)