The Part 15 label pretty well says it. Part 15 devices must not cause harmful interference to licensed services and must accept any harmful interference from licensed transmitters. They operate entirely on a secondary, provisional basis. They enjoy no legal protection whatever from duly licensed radio transmissions.
The provision that it is illegal to deliberately cause interference to another radio communication wouldn't apply here, because if you interfere with a telephone, stereo or other device that is not intended to pick up radio signals but inadvertently acting as a radio receiver, you are not interfering with a RADIO communication. A phone call or listening to a CD is not radio communication.
A similar topic came up some time ago regarding deliberately jamming illegal CB'ers on 10 m. Some argued that it would be illegal, since you are knowingly interfering with another radio communication. Finally Riley Hollingsworth of the FCC stated that, as far as the FCC is concerned, since the CB transmissions are unlicensed and illegal, legally they DON'T EXIST, and therefore enjoy no legal protection whatever, and a legally operating licensed station could never be cited for interfering with them.
My philosophy on telephones and other audio devices is to CO-OPERATE but OPERATE.
I once had a neighbour who complained that she could hear me in her telephone. She said my transmissions did not make it difficult for her to use the phone, but she was highly upset because she was convinced that since she could distinctly hear me in her phone, I could monitor her telephone conversations on my radio. No amount of expraining the principles of radio and telephone communication could convince her otherwise.
Don K4KYV
