New Application Note: Integrating GNSS Oscillators in Telecom Equipment
Our latest application note covers installation, antenna placement, and holdover configuration for Quartzlock GNSS-disciplined oscillators.
Quartzlock GNSS-disciplined oscillators provide exceptional frequency accuracy when properly installed. This application note provides practical guidance for integrating them into your system.
Antenna Placement
Correct antenna placement is critical for reliable GNSS signal acquisition:
- Mount the antenna with a clear view of the sky — ideally on a rooftop with no obstructions above 10° elevation
- Keep the antenna cable as short as possible to minimise signal loss
- Use low-loss coaxial cable (LMR-400 or equivalent) for runs longer than 10 m
- Ensure the antenna is properly earthed for lightning protection
Holdover Configuration
Configure the holdover mode to suit your application's requirements. For telecom applications requiring compliance with ITU-T G.812, set the holdover filter time constant to at least 1000 seconds to achieve the required frequency accuracy during GNSS outages.
Monitoring and Alarms
All Quartzlock GNSS oscillators provide status outputs and alarm contacts. Connect these to your network management system to receive alerts in the event of GNSS signal loss or equipment fault.
The full application note, including configuration examples and troubleshooting guidance, is available for download from our technical resources page.