To configure a radio data link

1. Connect the controller, receiver, radio and, if required, the power supply. See To connect a radio to the GNSS receiver.
2. Tap and select Settings / Survey styles. Select the required survey style. Tap Edit.
3. If you are setting up the data link for the:
   • rover receiver, select Rover data link.
   • base receiver, select Base data link.
4. Set the Type field to Radio.

5. Set the Radio field to the radio type you are using.

   If your radio does not appear on the list, select Custom radio and then define the receiver port, baud rate, and parity.

6. If the radio link being used has a known maximum data throughput rate, select the Bandwidth limiting check box and then enter the known maximum data value in bytes per second into the Bandwidth limit field.

   The GNSS base receiver uses this value to logically reduce the number of satellite messages so that the maximum rate is not exceeded. This option is available for CMR+, CMRx, and RTCM v3.x broadcast formats.

   If you have an old radio or run at low baud rates and if you’re not getting all the base SVs, try lowering the bandwidth limit until you do.

7. If the radio is connected:

   • directly to the receiver, clear the Route through controller check box. Specify the receiver port number that the radio is connected to, and the baud rate for communications.
   • to the controller, select the Route through controller check box. This enables real‑time data between the receiver and the radio to pass through the controller. Specify the controller port number that the radio is connected to, and the baud rate for communications.

    

   • To connect to and configure the internal settings of the radio you have selected, tap Connect.
   • If the Connect softkey is not displayed, you cannot configure the internal settings for the type of radio you have selected.
   • Some TRIMTALK and Pacific Crest radios must be in command mode before they can be configured. Command mode happens momentarily at power up. Follow the prompts to connect to the radio.
   • To add a new receive frequency for the rover radio, tap Add Frq. Enter the new frequency and tap Add . The new frequency is sent to the radio and appears in the list of available frequencies. To use the new frequency, you must select the frequency from the list.

8. If the details are correct, tap Enter.

   A radio signals icon appears in the status bar when a survey is started. If there is a problem with the data link between the base and rover receivers, a red cross is drawn over the radio signals icon .

   Tap on the radio signals icon to check the settings. If the controller is connected to a receiver with an internal radio you can also reconfigure the radio's internal settings.

You can also access the data link configuration by tapping the Data link button in the GNSS functions screen. See GNSS functions.

In some countries it is illegal to change the frequency of a radio. The Trimble Access software uses the latest GNSS position to see if you are in one of these countries. If you are, only the available frequencies are displayed in the Frequency field.

If you select Base data link and set the Type field to Custom radio, you can also enable Clear To Send (CTS).

The internal radio in a Trimble integrated GNSS receiver can also operate as a base radio if it is configured as a transceiver, and if the UHF Transmit option is on in the receiver. This avoids having to use an external radio solution at the base receiver to broadcast base data.