OCXO equipped Multi-GNSS Disciplined Oscillator ModelGF-8705
GF-8705 provides highly precise timing information (1PPS and 10MHz), which can be used as a source of IEEE1588 PTP (Precision Time Protocol)
FURUNO continues to solidify its reputation in the timing market as a leading supplier of GNSS Disciplined oscillators. The FURUNO GF-8705 provides the highest precision and stability required to control TCXO, OCXO and Rubidium oscillators. Timing information generated by our GF-8705 is the same precision as an atomic oscillator. The GF-8705 holdover function continues to provide precise timing information even if GNSS signals are lost.
* Holdover performance… Timing performance continues if GNSS signals are lost.
|1PPS Accuracy||Holdover time|
|Lock State||±50 ns||‐|
Industry required holdover performance is higher than ever for supporting new LTE, 5G and other advanced infrastructure equipment. GF-8705 technology keeps the established standard 1PPS accuracy at <±1.5μs/24H during holdover.
GF-8705 is an OCXO equipped high sensitivity multi-GNSS Disciplined Oscillator. It has expanded capabilities and the world's best-in-class holdover function with low phase noise
Outputs highly stable 10MHz frequency (selectable 4-40MHz) and 1PPS or 2PPS synchronized with UTC time
The following graphs display the GF-8705 1PPS time accuracy test results (10 test samples) both in Lock State (stable condition) and in holdover. The ambient air temperature was varied during the test. The GF-8705 outputs highly accurate 1PPS in Lock State, severe environments, and also in a holdover condition. The GF-8705 achieves extraordinary 1PPS performance accuracy, achieving <±1.5μs/24H in holdover thanks to our advanced FURUNO oscillator control technology. This technology controls the OCXO frequency variances, temperature, aging and other characteristics using our own proprietary algorithm.
The following graphs display the GF-8705 test results of TDEV and MTIE (Green line). The dotted line represents the specified value in ITU-T G.8272/Y.1367 “Timing characteristics of primary reference clocks *”.
* Primary reference time clocks (PRTC) provides the signals of synchronization standard for the master clock Example: Grand master clock utilized for network synchronization in a packet network.
FURUNO Advanced Multi-GNSS Disciplined Oscillator supports concurrent reception of GPS, GLONASS, QZSS and SBAS. A variety of product line up is available depending on holdover performance, low phase noise performance of reference frequency, size and cost. FURUNO Advanced GNSSDO supports Active Anti-Jamming functions and Multipath Mitigation functions and provides highly accurate and stable 1PPS synchronized with UTC time as well as highly stable frequency coherent to 1PPS.
* GF-8701 / GF-8702 and GF-8703 series are pin compatible. Also the GF-8704 is pin compatible with the GF-8705. All units have identical output protocol formats. This allows easy, multipurpose PCB development for each GF-87 series based on the particular application.
Regarding the installation environment and temperature requirements, please refer to the corresponding hardware specifications for the related device.
|Lock State||Frequency Accuracy (24H)||< ±1×10-11||< ±1×10-12|
|Short Term Stability*||< 1×10-9||< 2×10-10||< 1×10-10|
|Short Term Stability*||-||< 2×10-10||< 1×10-10|
* Root Allan variance (τ=1s)
|Lock State||1PPS Accuracy||< ±100ns||< ±50ns|
|1PPS Stability||< ±15ns（1σ）|
|1PPS Accuracy||-||< ±50μs||< ±10μs||< ±5μs||< ±1.5μs|
|1PPS Accuracy||< ±0.1μs||-||-||-||2H|
Evaluation kit for GF-87 series (GF-8701, GF-8702, GF-8703, GF-8704, GF-8705).
Connect the PC with a USB port to communicate. Output time pulse (1 PPS) and 10 MHz reference frequency (selectable) from a SMA terminal.
Contents: GNSS antenna, CD (GNSS Conductor GF), USB cable
You can download various documents and software for the GF-87 series.
For further information, please feel free to contact us.