• GNSS for Time Sync
GPS Disciplined Oscillator

Model GF-8557
  • Discontinued Products

The GF-8557 is a high sensitivity GPS Disciplined Oscillator with internal OCXO, which provides highly-accurate and highly-stable 1PPS/10MHz.

The GF-8557 outputs 1PPS synchronized with UTC as well as 10MHz coherent to 1PPS.
The GF-8557 is designed especially for wireless broadband base stations for CDMA, WiMAX, and LTE networks and for multimedia broadcast base stations.

  • GNSS (Timing, Automotive/Industrial)

Features

Built-in high sensitivity GPS receiver.

Provides highly-stable frequency and highly-accurate UTC time anywhere around the world.

Outputs 1PPS (pulse per second) synchronized with UTC time.

Outputs 10MHz sine wave and square wave coherent to 1PPS.

Continuously outputs highly-accurate and highly-stable 1PPS and 10MHz clock even when only one GPS satellite signal is received.

Continuously outputs highly-accurate and highly-stable 1PPS and 10MHz clock even when the GPS signal is lost in holdover.

Maintenance-free with the OCXO controlled by GPS.

DGPS with SBAS satellites (WAAS/MSAS/EGNOS).

Specifications

General

GNSS Reception Capability

GPS L1 C/A, SBAS L1 C/A

GNSS Reception

14 channels (GPS, SBAS)

Sensitivity

-140dBm to -110dBm

10MHz Output (Lock State)

Frequency Accuracy:< ±1×10⁻¹²

1PPS Output (Lock State)

1PPS Accuracy: < ±150ns
1PPS Stability: < 30ns(1σ)

10MHz Output (Holdover)

Frequency Accuracy: <±1×10⁻⁹/24h (Temperature alternation within 20°C )

1PPS Output (Holdover)

1PPS Accuracy: <±8μs/24h (Temperature alternation within 20°C )

Supply Voltage

5.5VDC

Power Consumption

Normal Status < 10W, Startup < 14W

Operating Temperature

-20°C to +80°C

Antenna Detection

Short and Open Detection

Alarm Output

Available

Outer Size

100mm×100mm×19.9mm (It excludes the interface connectors.)

Protocol

NMEA 0183 , TOD

Drawing

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