Ask the old RF curmudgeon: “What about RF interference from LED fixtures?”
As for your observation of the LED transmitter, I only have a UHF two-way radio in my car, so I haven’t noticed the “LED effect” on the high VHF band. We have a lot of LED traffic lights in my area, so part of the equation is in place. And don’t forget all those red LEDs in car taillights now. I also haven’t noticed any LEDs directly on FM broadcast channels, including IBOC stations, but that’s more of a reflection that we have such strong broadcast signals in my area of the country.
In response to your other comment, yes, the FCC doesn’t give a damn about the RF spectrum or its purity. I believe that this trend started more than a decade ago and is driven by two deeply entrenched political positions within the Commission. First, they really want to get out of the enforcement business. They don’t get major points or funding from Congress for running the Office of Field Enforcement (or whatever it’s called now), spectrum enforcement is a bottomless pit for them, and it’s a never-ending task. They prefer to auction off the spectrum and say to the happy buyer, “Keep *your* bands clean! We’re outta here!”
The second is the deeply ingrained regulatory notion that “cellular broadcasting” with its simultaneous frequency reuse is the highest and best use of the spectrum. If you use cellular, you don’t have to worry too much about the ambient noise level since the transmitters are always quite close to the users. The cellular regulatory model works not only in public land mobile telephony, but also in private land mobile telephony (where it is very difficult to obtain new PLMRS licenses for large area stations on top of mountains or major towers, and if you get a over most stations then you can run “walkie talkie” power levels. And on broadcast (LPFM and LPTV, which also conveniently use all available channel slots). And on unlicensed consumer Part 15 wireless LANs.” Et cetera, etcetera, etcetera, as the King of Siam would say.
I don’t know if you got it at the time, but a few years ago, the Commission introduced an NPRM proposing to *allow* sources of interference on licensed channels (in this case, microwaves), using a concept known as “Interference Temperature! ” The idea was that the “smart radios” at the source of the jammer would “know” when the source had gone a bridge too far and then turn off. Lacking that degree of equipment capability on the part of jammers, the channel licensee could always monitor and yell when the measured “jamming temperature” exceeded set limits.
The industry quickly dropped that idea *^@(&^!
So, spurred on by these two philosophical points, the Commission now says, “Please go ahead and trash the spectrum with lots of low-power, unlicensed devices, power lines that rattle, power meters that screech, high-speed digital logic with time femtosecond switching (I exaggerate, but not by much!), screeching LEDs – we don’t care, and we don’t enforce the law here in Dodge City anymore!
As soon as some clever businessman discovers a use for the 4 Kelvin cosmic microwave background radiation, it too will be quickly licensed and eventually auctioned off.
You and I, being veterans of this art and science, understand what an invaluable resource the RF spectrum represents and we respect it and do what we can to keep it in good working order. The Commission, especially in recent years, has been run and managed by lawyers, economists and politicians who do not know the physics behind electromagnetic transmission, have none of the “vision” for future non-economic uses for which the spectrum silent could be used, and they consider the spectrum mainly as an exploitable economic good. What would you expect?
Adding to this outrage, there is too much transfer of communications from wired to wireless modes today. Most people don’t really need a “belly button web service”. Now my eleven-year-old granddaughters have their own cell phones. Give me a (&#%$@& break!
Many, many services could be provided well and cheaply over cable, if only we had a universal fiber broadband network in this country. But that is another failure of the Commission on the “vision issue.” The Asians and perhaps the Europeans will “clean our clocks” only with this failure.
So, sayonara RF spectrum, my dear old love! I will always remember you as you were in those distant days when you were still young, fresh and beautiful.