LabSat 3 Wideband features a multi constellation GNSS receiver which can be used to monitor L1 band GNSS signals in either the incoming RF signal during recording or the outgoing RF signal during replay. The USB device connector on the rear of LabSat 3 Wideband functions as a virtual serial connection and will output NMEA data from the GNSS monitor at 115,200 baud when record or replay is active.
In addition to this, pressing the 'OK' button during record or replay will switch the display to show satellite tracking levels for GPS L1, GLONASS L1, Beidou B1 and Galileo E1 satellites. Pressing the up or down arrows in this display will swap between constellations. It is important to note that when switching between constellations on the LCD display, the configuration of the GNSS monitor, and therefore the NMEA data content, will change.
The primary aim of the GNSS monitor during recording is to give indication that an L1 band GNSS antenna is connected and working. It is important to understand that the monitor is listening directly to the RF input and so the presence of valid satellites indicated by the monitor does not have any link with the user configured constellation frequencies being recorded. Therefore it is up to the user to check that these are correctly configured. If the antenna used does not support L1 GNSS signals, then the GNSS monitor will not show any satellite tracking information.
During replay, the GNSS monitor will listen into the RF output signal. If the replayed signal contains valid L1 GNSS signals then these will be reported by the monitor.