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A diverse family of reference products from the low cost TCXO to low noise atomic references disciplined to GNSS. 10 MHz to 100 MHz locked references.   Modular references that can operate from -60 to +60 Vdc in remote towers to rack mount atomic multi-channel references offering high stability, low noise and reliability as well as SNMP for remote monitoring and control. Reverse polarity protection, transient and fault protection and conservative design practices enable a product that will provide years of service. Kits availble that include antenna, cables and power supply.

Sub Categories

Frequency Locked Multipliers and Dividers, 100 MHz, 50 MHz

Novus frequency multipliers and dividers allow a single locked reference to be multiplied or divided to meet a unique system requirement for more than one frequency reference.Applications include synchronus AM.


Modular DC Powered- 10 & 100 MHz Source

Low noise OCXO disciplined to the GNSS.Built-in test and GNSS lock status provides simple system integration to GPSDO status. Wide input operating range from -60 to +60 Vdc. Auto-calibration compensates for long-term drift. Full- RS232 NMEA data and PPS pulse. One, two and three and six channel platforms- kits available. PPS stabilization option reduces pulse to pulse PPS jitter to < 1 ns.


Rackmount References

Novus rack-mount references are offered with a broad range of timing technology. From one, four, ten and sixteen channel platforms, driven by low cost TCXO, low noise OCXO, GNSS locked references and atomic to meet your system needs. Multi-channel designs frequenctly eliminate the need for a distribution amplifier with less noise contribution. Full redundancy options provide switching within the chassis to simplify installation. SNMP provides extensive rempte monitoring and control.

Portable References

Timing where you need it. GNSS locked, built-in antenna and powered by a lithium battery. 10 MHz and secondary synthesized channel. External trigger inputs initiates time/position stamping that can be emailed to your computer. NTP time server option. PPS and NMEA simulator sources provide data even when GNSS signals are completely lost. Holdover options that include OCXO and atomic.

Ultra-Low Noise References

References that are designed for those applications where phase noise is a major consideration. These instruments feature ultra-low phase noise OCXO's along with supporting electronics designed to minimize any degradation of the reference signal. In some designs, the OCXO is vibration isolated from the chassis to minimize vibration induced phase noise. Products are available in chassis or as PCB assemblies.

Lock In Amplifer phase noise

High Resolution Stamp

Novus offers a portable and a modular GNSS locked reference with a high resolution time stamp. The units feature single and dual triggers to allow differential time stamping. Time stamping resolution is 100ns with an accuracy of 1 usec to UTC with rates over 100 kHz. Up to 512 events can be stored with configurations that allow the e-mailing of events to a remote location. OCXO and atomic holdover options.

PCB Assembly

Integrate a precision 10 MHz reference into your system. Operates from a single 5 Vdc supply. NMEA-0183 at full rs232 levels and PPS. GNSS lock status and built-in test signals for monitoring. Simple mounting and connector options. The NR4600-O-G is a PC104 compatible 6 channel GNSS frequency reference.

OCXO References

Precision SC cut crystals provide excellent stability and phase noise. Novus offers a range of phase noise and stability options to meet the most demanding applications. While 10 MHz dominates applications- other frequencies can be directly generated from a custom OCXO or from an internal synthesizer from fractions of a Hz to 50 MHz.

TCXO References

TCXO are an excellent low cost alternative to an OCXO. They do not offer the stability and phase noise performance of an OCXO but are acceptable for many less demanding applications.

Typical performance metrics are given below:


Frequency Reference Comparison


GNSS Locked Frequency Reference

GNSS disciplined references use timing information from the GNSS to synchronize a local reference. Long-term accuracy on the order of E-12 is common. The GNSS oscillator can be crystal or atomic with a wide range of performance options depending upon the specific requirement. A range of configurations are available from PCB assembles that can be easily embedded into a system, to rack mount units with up to ten channels. Self-calibrating references essentally eliminate long-term drift by storing the current calibration coefficients for the 10 MHz OCXO in FLASH memory (see demonstartion video). Kits are available complete with the selected GNSS locked source, antenna, power supply and cable - everything you need to have a fully operational source. GNSS locked oscillator products are considered to be frequency standards by NIST (NIST white paper). Most GNSS locked references also provide the PPS ( pulse per second) and NMEA 0183. The algorithms for locking the ocxo to the GNSS offer a wide range of sophistication. Some configurations can be as simple as a PLL while others use complex algorithms to provide improved phase noise. In additio to algorithms to lock the OCXO,  There are also complex algorithms used to stabilize the PPS. PPS jitter is in large part due to transmission effects which can add 5 to 10 ns of pulse to pulse jitter. Processing can improve jitter to below 1 ns.

Signal Converters

Frequently a sine wave is not the most desirable format for a reference. In some applications, a very high slew rate is required and a square wave is needed.

Very often copper coaxial cable is not the ideal transport means for a reference. In an electromagnetically active environment, copper coaxial cable can pick-up noise and degrade the reference. Fiber optic cable is basically immune to electromagnetic interference.

The NF0100 was designed to easily convert a reference signal to a more compatible format:

Sine wave to a square wave
Square wave to a sine wave
Sine wave to a fiber optic signal- 1300 nm -single and multi-mode
Fiber optic to a sine or square wave
Pulsed waveform (such as PPS) to fiber optic
Pulsed fiber optic back to electrical pulse

NF0100-LN offers phase noise performance that one could only get from copper---140dBc/Hz

Fiber Optic Products

Needs Description

Lock-in Amplifiers 

Lock-in amplifiers take an external reference- 10 MHz or PPS and lock a low phase noise OCXO to the external source. This a valuable product when timing synchronization is essential but lower phase noise is required. The phase noise may have been compromised or degraded due to a long transmission line or fiber optic conversion. A lock-in amplifier can restore a desired performance level and maintain system synchronization.

NR2310D-OG 10 MHz OCXO based 10 Channel Novus Frequency Reference
SKU: NR2316-O-G