GNSS Timing places its own demands on the antenna: the link budget, the interference environment and the physical install all differ from a generic gps / gnss antennas deployment. This page works through those requirements and maps them onto specific models.
What the application demands
This deployment sets its own constraints on the antenna: the link budget, the interference environment, the physical mounting and the environmental exposure all have to be specified together rather than one at a time.
Turning that into a specification
- Take the operating band from the radio datasheet, including any guard at the band edges.
- Decide the coverage shape first, omnidirectional or sector, and only then take the highest gain that still fits it.
- Measure the feedline run and subtract its loss before comparing antenna gain figures.
- Confirm the connector on the radio and order the matching interface rather than adapting in the field.
Models used for GNSS Timing
| Model | Band (MHz) | Gain | Polarization | Length | Connector |
|---|---|---|---|---|---|
| AW-GP1227-35 | 1176–1606 | 35 dBi | RHCP | 152 mm | TNC-Female |
| AW-GP1575-28 | 1575–1606 | 28 dBi | RHCP | 50 mm | SMA-Male |
| AW-CP-GPS-2525A | 1575–1576 | 28 dBi | RHCP | 25 mm | IPEX MHF (U.FL) |
Grounding and surge protection
Rooftop GNSS antennas use an in-line DC-pass surge arrestor that protects the receiver while passing the antenna bias voltage to the LNA.