Search

GPS/GNSS Modules

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.

Timing

Related Contents

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

Documentation

Contact

Locate a Distributor Contact a local distributor for further details.

* Specifications subject to change without notice.

GPS/GNSS Modules