I've been doing some interesting reading on emissions from radar detectors in the interest of determining how Cobra complies with the "FCC Credo", as I call it. To paraphrase, "This device shall not cause any harmful interference, and shall accept all interference received", that statement you see on all sorts of electronics. Apparently, going back to 2002, there were complaints that detectors (supposedly Cobras only) had levels of emissions around ~12Ghz that were interfering with "Very small aperture terminals". Some sort of accord was reached, and manufacturers complied to eliminate interference within this range.
My question pertains to how Cobra is able to, in effect, interfere with other devices in the Ka band range and yet remain in compliance with FCC rules, such that they are able to get FCC approval to market their detectors. I have a few theories, none of which I'm able to confirm.
1. Harmful Interference, as defined within the FCC rules(Any emission, radiation or induction that endangers the functioning of a radio navigation service or of other safety services or seriously degrades, obstructs or repeatedly interrupts a radiocommunications service operating in accordance with this Chapter.) seems to specify that harmful interference is only that which interferes with the above referenced devices or services. That might be enough to do it right there.
2. It may fall under the "incidental radiator" exclusion, such that its primary purpose is not to emit radio at a certain frequency. That also might be enough to do it.
3. This interference doesn't occur for anything other than detectors, so the FCC ignores it?
Despite the definition of "harmful interference" or "incidental radiator", it seems that this would be a concern for the FCC. It's certainly a concern for me, as it infuriates me to no end to receive falses from these devices. Anybody have more specific info or answers on how Cobra gets by on this? Is this even applicable?
Link for reference, PDF