FCC Part 15: Difference between revisions
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Revision as of 14:03, 20 May 2025
This article describes the regulations from Part 15 of the FCC Code. Note that this information is specific to the 2.4-2.4835 GHz band. While Part 15 covers more than just that band, this article does not. Note some requirements may be different in other bands.
Most of this is from: 15.247
Original File: FCC Part 15 - Radio Frequency Devices
Frequency Hopping
- Minimum Channel Carrier Separation = 25kHz or (2/3) of the 20dB bandwidth of the hopping channel (whichever is greater, provided output power of < 125mW, if >125mW then remove the 2/3)
- Systems should use a minimum of 15 channels
- Each channel should (on average) be used equally (systems may avoid transmitting on a particular frequency as long as 15 channels or more are used)
- Average time of occupancy on any channel <= 0.4 seconds
- Minimum 6dB bandwidth = 500 kHz
- Maximum Power = 1 W (if you have >= 75 non-overlapping hopping channels) or = 0.125 W (otherwise)
- Directional gain antennas > 6dBi must reduce transmit power (1dB power reduction for every 3 dB of gain above 6dB)
- In any 100kHz bandwidth outside the operating band, the power should be 20dB below the highest level of transmit power