27. What is "dense reader" mode?
This is a mode of operation that prevents readers from interfering with one another when many are used
in close proximity to one another. Readers hop between channels within a certain frequency spectrum
(in the United States, they can hop between 902 MHz and 928 MHz) and may be required to listen for a
Signal before using a channel. If they "hear" another reader using that channel, they go to another
channel to avoid interfering with the reader on that channel.