Topcon GR-3 Digital UHF Radio Addendum

About this manual

This addendum provides detailed instructions for configuring the Digital UHF radio modem on the Topcon GR-3 receiver, covering Base/Rover setups in PDL and Simplex modes as well as GSM modem configuration. It also includes safety notices, required PC setup, and software tools such as Modem‑TPS.

Additional sections cover troubleshooting tips and comprehensive specifications for the modem’s transmitter, receiver, and general parameters, helping users optimize performance and resolve common issues.

What's inside

• GR-3 Digital UHF Radio Configuration
• Configuring the Radio Modem
• Base/Rover PDL Mode
• Base/Rover Simplex Mode
• GSM Radio Modem Configuration
• Troubleshooting
• Appendix A – Specifications
• General Details
• Digital UHF Transmitter Specifications
• Digital UHF Receiver Specifications

Specifications

Frequently asked questions

What PC requirements are needed to configure the GR-3 Digital UHF radio modem?

A PC running Windows 98 or newer, Modem‑TPS version 2.2p0 or newer, and a serial cable or Bluetooth connection are required.

What is the default protocol setting for the GR-3 Digital UHF radio modem?

The default protocol is PDL with End‑of‑Transmission (EOT).

How far must a user stay from the radio modem to meet RF exposure requirements?

Maintain at least 25 cm between the user and the radio modem.

What link rate is used by default for GMSK modulation?

The default link rate for GMSK is 9600 bps.