How many channels does the PRS RF system use and how does it find a channel?
The PRS RF system partitions the 2.4GHz frequency band into 78 separate channels with two PN code options, providing up to 156 channel combinations. Of these 156 channels, 26 are allocated to broadcasting class information from the Receiver. The 130 remaining channels are used to send data from the Clickers to the Receiver. The PRS RF Receiver selects channels dynamically. At startup, the Receiver performs a scan of the entire 2.4GHz spectrum and selects the channels that have the least amount of RF energy. This ensures that, in all likelihood, other products operating in the 2.4GHz band will be avoided. Channels 1-9 and A-D are the designated channels used by the RF Receiver to broadcast the class. PRS will display the assigned channel to provide a quick jump directly to that channel, so students can avoid having to wait for the scan to complete, which can take several minutes.
