Ah yes. The old Part 15 regulations. The gist of it is any device that runs under that part of the FCC regs can run unlicensed. No licensing hassles, no type acceptance, etc. You can build it, say it runs under Part 15, and you're pushing it out the door. That 'unlicensed' part is the kicker. If your device interferes with /licensed/ services (Police, Fire, Aircraft frequencies, AM/FM broadcast, TV, etc) then it's up to you, or the manufacturer of the device, to correct it. You, on the other hand, have to accept whatever interference comes your way.
Which is where the fun comes in when you have two Part 15 devices (a wireless router and a cordless phone) operating in the same band, as you have here, because as the OP told them, it's either accept it or change the frequency range of one of them, and the phones are the easier option. I had the same problem, and bought a phone that ran in the 5.8 Ghz range instead, and it also used spread spectrum, which is a frequency hopping method that can eliminate interference. Basically, each device transmits for a split second on a set of pre-determined frequencies. Both the transmitter and the receiver use the same algorithm to determine what frequency will be next in line, so the signal is transparent to anyone else using those frequencies, even other spread spectrum devices since they use different frequency hopping algorithms. I've noticed a fair amount of devices starting to use it.
Which is where the fun comes in when you have two Part 15 devices (a wireless router and a cordless phone) operating in the same band, as you have here, because as the OP told them, it's either accept it or change the frequency range of one of them, and the phones are the easier option. I had the same problem, and bought a phone that ran in the 5.8 Ghz range instead, and it also used spread spectrum, which is a frequency hopping method that can eliminate interference. Basically, each device transmits for a split second on a set of pre-determined frequencies. Both the transmitter and the receiver use the same algorithm to determine what frequency will be next in line, so the signal is transparent to anyone else using those frequencies, even other spread spectrum devices since they use different frequency hopping algorithms. I've noticed a fair amount of devices starting to use it.
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