If your RF Explorer device is a “Combo” model, then there are two radio modules available. However, only one can be active at a time. To toggle between the two radio modules use the built-in LCD screen and ‘Menu’ key to navigate to the ‘FREQUENCY MENU’. Use the arrow keys to select ‘Module’ at the bottom of the menu and then press ‘Enter’ to toggle between the two radios. The image below is an example from a model 3G Combo, whose two radio modules support the frequency ranges 240-960 MHz and 15-2700 MHz.
When the device first boots one of the first screens shows two rectangles that represent the two radio modules. The rectangle that represents the radio module that is currently active is labeled as ‘[ACTIVE]’. Also, the asterisk (*) attached to each rectangle indicates which antenna is connected to which radio modules.
At any time you can review which radio module is currently active by using the built-in LCD screen and ‘Menu’ key and selecting ‘RF Connections’ from the main menu.