GPS/GNSS Modules

Multi-GNSS Disciplined Oscillator Model GF-8705NEW

For Timing

OCXO equipped High sensitivity Multi-GNSS Disciplined Oscillator which has expanded capabilities, world's best-in-class holdover function and low phase noise

GF-8705 outputs 1PPS synchronized with UTC as well as 10MHz coherent to 1PPS.
GF-8705 can receive concurrent GPS, GLONASS, QZSS (Quasi-Zenith Satellite System) and SBAS signals.
GF-8705 is suitable not only for wireless communication, network communication and Grandmaster clock for multimedia broadcast, but also as a atomic oscillator replacement.

Related Contents

Features

  • Outputs accurate 1PPS, low phase noise, highly stable frequency coherent to 1PPS

    ・Continuously outputs highly accurate and stable 1PPS (pulse per second) synchronized with UTC time as well as highly stable frequency coherent to 1PPS
    ・Reduces errors in digital communication by providing highly accurate and stable frequency
  • Built-in high-sensitivity timing Multi-GNSS receiver with improved noise tolerance for harsh environments

    ・Receives concurrent GPS, GLONASS, QZSS (Quasi-Zenith Satellite System) and SBAS signals
    ・Flexible antenna installation locations thanks to high sensitivity and twice the number of satellites in view as opposed to GPS-only positioning
    ・Reduces effects of internal and external noise thanks to Active Anti-Jamming and Advanced Multipath Mitigation
  • Supports world's best-in-class holdover function

    ・Even if GNSS falls into unlock, the FURUNO GNSSDO will predict oscillator behavior and automatically make corrections thanks to FURUNO's Advanced Oscillator Control Function
    ・Continuously outputs highly accurate and stable 1PPS and frequency
    ・Achieved superior cost/performance as a atomic oscillator replacement
  • Support compatible design depending on customer's requirement

    Supports the same output format as well as pin-compatible design (GF-8704, GF-8705)
    ・GNSSDO can be customized to meet unique customer requirements
     
    Product
    Name
    Timing Specifications (1PPS) Frequency Specifications
    (10MHz)
    Size (mm)
    Normal Status Holdover Normal Status (24h avg.)
    GF-8704 <±50ns <±5μs/24h <±1×10-12 100 x 52 x 20
    GF-8705 <±50ns <±1.5μs/24h <±1×10-12 100 x 52 x 20
  • Time Synchronization

    Selectable sources for time synchronization from UTC time or GPS time
  • Selectable Position Mode

    ・Time Only (Position-hold) Mode will output stable time pulse (1PPS) and frequency even if only one GNSS satellite signal is received
    ・Navigation Mode to be used in the moving vehicle applications
  • Antenna Connection Status Check Function

    Checks the antenna connection status (Open or Short)
    ・Assesses antenna connection failure or malfunction easily
  • Antenna Power Supply Function

    Provides power from GNSSDO directly to antenna
    ・Enabling a simplified antenna connection
  • Backup Power Supply

    Significantly reduces recovery time to GNSS lock after rebooting or interruption
  • Synchronization with external pulse

    Enables synchronizing to time pulse from an external source
    ・Usable to synchronize to time information such as IEEE1588 or SyncE obtained through the network
    ・Improves robustness of the system
  • Arbitrary frequency output

    Enables arbitrary frequency output separately from reference frequency
  • Wide operation temperature range

    ・-40°C to +85°C
  • Suitable for Grandmaster clock

  • Suitable for various communication and broadcasting applications

    For infrastructure requiring product reliability
    ・Small cell applications including LTE (TDD/ MBSFN/ CoMP/ eICIC)
    ・Multimedia broadcast base stations or wireless base stations
    ・Smart grids

Specifications

GENERAL

GNSS Reception CapabilityGPS L1 C/A, GLONASS L1OF, QZSS L1 C/A, SBAS L1 C/A
GNSS Reception26 channels (GPS, GLONASS, QZSS, SBAS)
SensitivityGPS
Tracking: -161 dBm
Acquisition: -147 dBm

GLONASS
Tracking: -157 dBm
Acquisition: -143 dBm

*Measurement platform with recommended active antenna
Time to "Fine Lock"5 min
10MHz Output (Normal Status)Frequency Accuracy (24h avg.): <±1×10-12
Short Term Stability: <1×10-10
1PPS Output (Normal Status)1PPS Accuracy: <±50ns
1PPS Stability: <15ns (1σ)
10MHz Output (Holdover)Frequency Accuracy (24h): <±1×10-9
Short Term Stability: <1×10-10
1PPS Output (Holdover)1PPS Accuracy: <±1.5μs/24h
Supply Voltage5.5VDC
Power Consumption<0.5A (5.5VDC, Normal Status)
Backup Supply1.4 to 3.6VDC / 0.4 μA (Normal Operation)
Operating Temperature-40°C to +85°C
Antenna DetectionShort and Open Detection
Outer Size100mm x 52mm x 20mm
ProtocoleSIP (NMEA 0183 Standard Ver 4.10)
Anti-JammingAvailable
Multipath MitigationAvailable
FunctionsExternal Referense Synchronisation, Output Status Signal

Evaluation Kit

P/N VF-05 : Evaluation kit for GF-8705


Connect the PC with a USB port to communicate. Output time pulse (1PPS) and 10 MHz reference frequency (selectable) from a SMA terminal.

Contents: GNSS antenna, CD (GNSS Conductor GF), USB cable


Evaluation kit configuration (video)
simple use by connecting the GNSS antenna with the power supply.

Documentation

Contact

Locate a Distributor Contact a local distributor for further details.

* Specifications subject to change without notice.

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