RTCM link is a medium to transport the correction data stream from the Base Station to the Rover(s).
At 2D Base Stations basically three options are available to transfer correction data:
- Transfer via Internet
- Transfer via Radio Frequency (RF) (1-20 km, depends on local restrictions)
- Transfer via direct Wi-Fi link (< 250 m)
Via Internent
Both the 2D Base Station and 2D RTK Rover modules have built-in Wi-Fi that can be set via a user interface to connect each module to a local Wi-Fi or mobile hotspot (multiple Wi-Fi connections configurable) to upload (Base Station) or download (2D RTK Rover) correction data to a 2D-hosted Internet server to establish the RTCM link via internet between Base Station and Rover(s).
Via Radio Frequency (RF)
Also, 2D Base Station and 2D RTK Rover both have the option to use 433/866/2400 MHz radio frequency transmission for transferring correction data from Base Station to Rover(s) for local operation up to 20 km operation radius, without requiring any internet connection at all. (use of RF depends on local restrictions).
Via direct Wi-Fi link
Instead of transferring correction data via RF in local operation without any internet connection, also the Wi-Fi interfaces of the 2D modules can be used in combination with external antennas to set up the RTCM Link via Wi-Fi point-to-point connection (< 250 m) via 2D Base Station and 2D RTK Rover(s).