The Federal Communications Commission (FCC) is an govt. Agency that decide which entities are allowed to use which part of the radio spectrum. The decision of the FCC determine in which ways radio signals are distributed, as well as in which ways devices like smart locks and radio stations is able to function. For these reason, many people dont consider the role that the FCC play until one of the devices that they own begins to no longer function as it should.
In most cases, however, the rule established by the FCC work to prevent the devices from interfering with each other. Thus, should any device not follow the rules established by the FCC, it is likely that it will create interference for other device. The radio spectrum is the range of radio frequency that the govt. Has determined to be usable.
How the FCC Stops Radio Interference
Within the FCC, these usable area of the spectrum are depicted on spectrum charts. Some of the user of the radio spectrum are licensed users, which means that the FCC allows licensed users to have protected block of the radio spectrum, and those protected blocks are with certain limit to the power and placement of the licensed users. Other user of the radio spectrum are unlicensed users, which means that these users have device that do not require a license from the FCC.
These unlicensed users must adhere to the Part 15 rule established by the FCC, which state that unlicensed users must remain within certain limit to their power level to avoid interfering with the licensed users with the radio spectrum. Every device that use the radio spectrum has an FCC ID. The manufacturer of the product places this FCC ID to indicate that the device has been tested.
Devices with an FCC ID indicate to the FCC and to others that the manufacturer has proven that the device will remain within the legal limit to its radiated power. Additionally, you must not remove the original antenna from a product with an FCC ID, as well as you must not change the firmware on the device to increase its transmit power. Should the user increase the transmit power, it is possible for the device to violate FCC rule, which can result in fines of thousands of dollars per day.
The FCC has determined that certain frequency band are used for certain purpose. For instance, Wi-Fi, Bluetooth, and Zigbee protocol use the 2.4 GHz frequency band, but microwave oven also use it. The 5 GHz frequency band has more channel than the 2.4 GHz band, but it require devices to detect radar signal prior to utilizing the 5 GHz band.
Finally, the 6 GHz band has even more room for device to utilize the band, but the 6 GHz signal travel shorter distance than those at 2.4 GHz. Thus, with the 6 GHz band, people must consider the placement of the antenna for those device that use the 6 GHz frequencies. Some system use shared spectrum arrangement.
One example of such a system is the Citizens Broadband Radio Radio Service (CBRS). With this system, there are no permanent owner of the radio frequencies. Instead, there are different priority band for device.
Devices can use the CBRS system to create a private network, but they must cease using the channel if any higher priority band require the use of that channel. Interference with the radio spectrum occur when a person does not follow the rule of the spectrum. For instance, a person who purchase an inexpensive device will likely find that the device does not have an FCC ID.
Thus, this unlicensed device without an FCC ID will create interference with other device in the area. Furthermore, people often purchase devices with higher-gain antenna instead of standard antenna for a device with an FCC ID. The FCC has certified the device and it’s antenna with a specific power level and antenna, however.
Additionally, many router allow individuals to increase the transmit power of the router. By increasing the power with which the device transmit, it is likely that it will begin to interfere with licensed user whose device are located many mile away from the router. All unlicensed device, however, must follow the rule that they may borrow the spectrum from licensed user, but they must clear the spectrum for those other device that may be using that same spectrum.
In order to avoid interference among device in the radio frequency spectrum, there are a few step that can be followed. First, each wireless device should have an FCC ID to verify that the manufacturer has tested it. Second, the power and frequency of the device should be matched with the environment in which it will be installed.
Third, the transmit setting for those device should remain at the factory setting to ensure that they are within the legal power limit as certified by the FCC. Finally, high-bandwidth data should be moved to the 6 GHz band rather than utilizing some of the older band that are becoming crowded with other device. Following these step will not only allow people to more effective use the radio frequency spectrum, but it will also help to reduce interference between device.