Ten channel low-noise frequency reference distribution amplifier. Ten identical amplifiers feature skew of ~ 5 ns. Each channel independently monitored for load impedance mismatch with independent warning indicators on the front panel. Outputs are transient and short circuit protected. Harmonic distortion well below -30 dBc. Minimal additive phase noise. While primarily used as a 10 MHz distribution amplifier, options are available to handle reference signals from 1 to 10 MHz.
Need SNMP-Remote monitoring- a local display? See the NR2310D-R
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.
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).
For many applications, the phase noise of a Rubidium reference is not acceptable. The NR2310D-R-O incorporates a low noise OCXO that is disciplined to the Rubidium reference. Ten channels typically meets the needs of most systems eliminating the need for a distribution amplifier and minimizing noise degradation. All channels are continuously monitored and displayed locally and accessible via RS232 or Ethernet.
10Hz -130
100Hz -140
1K -145
10K -150
For many applications, the phase noise of a Rubidium reference is not acceptable. The NR2310D-R-O incorporates a low noise OCXO that is disciplined to the Rubidium reference. This product also adds a 26 channel GNSS receiver that brings the long-term stability of GNSS. The NR2310D-ROG brings the best of three timing technologies together- the low phase noise of the OCXO, excellent holdover stability of Rubidium and the long-term stability of GNSS locking. Ten channels typically meets the needs of most systems eliminating the need for a distribution amplifier and minimizing noise degradation. All channels are continuously monitored and displayed locally and accessible via RS232 or Ethernet.
10Hz -130
100Hz -140
1K -145
10K -150
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 channel high performance PPS distribution amplifier features subnanosecond skewing (typically less than 200ps). Output drive factory configurable for BNC or SMA connectors, 3.3 or 5 Vdc logic levels and 50 Ohm drive capability. Each channel independently monitored for load impedance mismatch with independent warning indicators on the front panel. Outputs are transient and short circuit protected. Unit accepts two inputs and automatically selects valid input. Unit measures and reports pulse width.
Ten transient and fault protected PPS outputs with < 2 ns of channel skewing. Each channel is monitored and status displayed on the front panel. Built-in self-test drives a signal that can be tied into an alarm panel. Atomic holdover option holds PPS drift to less than 1 usec/hour ideal for GPS unstable environments.10 MHz frequency reference output available to stabilize local oscillators.
● Ten fault and transient protected outputs.
● Ten channels frequently eliminate the need for a distribution amplifier.
● Channel skewing < 2 ns.
● Drives 3.3 Vdc LVCMOS or 5 Vdc into 50 Ohms
● PPS accuracy < 1 Sigma 15 ns
● Optional 10 MHz low noise GPS locked output.
● Available as an atomic PPS source for GPS denied environments.
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. This combination gives you the best of two technologies – the stability of Rubidium and the low noise of an OCXO. This single rack unit chassis, having ten channels, frequently meets the needs of complex systems and often eliminates the need for a distribution amplifier.
10Hz -125
100Hz -140
1K -145
10K -150
A low cost reference featuring the stability of Rubidium (< 1 ppb/year). In many applications, an OCXO does not have the stability required and GNSS locking is not an option. This reference offers excellent stability where cost is a major driver and the higher phase noise of Rubidium is acceptable. If low phase is also required see our NR2310D-RO that adds a low phase noise OCXO to improve phase noise. The ten channel configuration yields a better phase noise and skewing than a reference and a separate distribution amplifier. Skewing for the ten channels is less than 5 ns. This single rack unit chassis, having ten channels, frequently meets the needs of complex systems and often eliminates the need for a distribution amplifier.
10Hz -85
100Hz -115
1K -135
10K -140
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.
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.
Specifications:
Typical Phase Noise
Offset Phase Noise (dBc/Hz)
1 Hz -50
10 Hz -100
100 Hz -120
1kHz -140
With Time Stamping
The NR6720-HS/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-HS/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. The unit also offers a high resolution time stamp that can capture up to 25 events at a rate of 10 kHz.
Typical Phase Noise
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.
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 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.
Low Cost dual channel 10 MHz Rubidium frequency reference. Channels are continuously monitored and displayed locally and accessible via RS232 or Ethernet.
10Hz -85
100Hz -115
1K -135
10K -140
Kits are available that include antenna, cables and power supply. Several features can be customized at the factory – frequencies other than 10 MHz either from a unique crystal or with a built-in synthesizer that is GNSS-locked. Time stamping capability to 100ns resolution. To meet unique requirements, we have shipped product with output features requiring a custom amplitude, square wave output, high voltage and high current drive.
