Freq agility and channel hoping concepts are used in two different contexts.
For a license free sub-GHZ product in the 902-928 MHz ISM band operating in the US or Canada, FCC part 15.249 allows the equivalent of less than 1 milliwatt, about -1 dBm output power, but does not require frequency hopping. Part 15.247 allows power as high as 1 Watt, +30 dBm, if frequency hopping spread spectrum is employed. Typically hopping over 50 or more channels (each accomodating a signal 250 KHz or less wide) and dwelling less than 400ms on any given channel in any 20 second period.
The range enhancement of using a thousand times as much power can often justify the added software complexity needed to implement the freqeuncy hopping algorithm and control.
Freescale's MKW01Z128 can be operated under either part 15.247 or 15.249 with the proper software implementation and off-chip power amplifier.
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