• GF-8048 GPS Rubidium Disciplined Oscillator
  • Overview

GF-8048 is a GPS Disciplined Oscillator (GPSDO) designed specifically for digital terrestrial broadcasting applications.
It integrates a GPS receiver and a Rubidium Oscillator, enabling reception of GPS signals and generation of a UTC-synchronized 1PPS (one pulse per second) signal, along with a 10 MHz sine wave signal coherent with the 1PPS signal phase.

  • Applications

Suitable for digital terrestrial master and satellite stations, providing precision 1PPS and 10 MHz stability even in challenging scenarios like signal-shadowed areas or high-field strength environments.

  • Features

• Easily provides highly stable frequency and high-precision UTC timing worldwide.
• The GF-8048 uses a rubidium oscillator as its base oscillator. Excellent low phase noise performance is achieved through the combination of an OCXO and GPS.
• Even when the GPS receiver loses satellite signals during holdover mode, the GF-8048 continues to output highly accurate and stable 1PPS and 10 MHz signals.
• The GF-8048 achieves coherence accuracy within ±10 ns between the falling edge of the 1PPS signal and the zero-crossing point of the 10 MHz sine wave.
• Every rubidium oscillator requires periodic calibration to maintain high-precision output. The GF-8048 features an automatic calibration function referenced to GPS signals. Real-time GPS control enables a completely maintenance-free GPS-disciplined frequency source.
• Specifically designed for digital terrestrial broadcasting transmission stations (main and relay stations).

  • Specifications

• GNSS Reception: GPS L1 C/A; 12 channels (GPS); sensitivity: -133 dBm to -110 dBm
• 10 MHz Output (Lock): Frequency accuracy < ±1E-11
• 1PPS Output (Lock): Accuracy < ±100 ns (95%)
• 10 MHz Holdover: ±2E-11/1h, ±3E-11/12h
• 1PPS Holdover: < ±400 ns/1h
• Free-Running Rubidium: Frequency accuracy < ±5E-10/year
• Power / Environmental / Dimensions: 48 VDC; performance assurance: -10°C to +45°C; operating temperature: -20°C to +60°C; dimensions: 207 × 327 × 98.5 mm
• Others: Antenna short/open detection; open collector alarm output; LED display; protocol: NMEA 0183