What all these people who keep talking about the limited spectrum and use that excuse to justify the manner in which the FCC has licensed and allocate stations, please explain to me how, in several countries and particularly in Europe, the FM band in major cities is literally crammed with stations, from end to end, broadcasting legally?
Here's some samples:
87.6, 87.9, 88.1, 88.3, 88.6, 88.9, 89.1, 89.3, 89.5, 89.7, 90.1, 90.3, 90.5, 90.7, 90.9...
87.5, 87.7, 88.0, 88.3, 88.6, 88.9, 89.2, 89.5, 89.8, 90.1, 90.4, 90.6, 90.9, 91.2, 91.4, 91.6...
87.5, 87.7, 88.0, 88.2, 88.4, 88.6, 88.8, 89.0, 89.2, 89.4, 89.6, 89.8, 90.0, 90.2, 90.4, 90.6...
I should mention that these stations also broadcast with rather high wattage and usually all from the same transmitter farm.
So how is it that those sorts of allocations work in those countries, but in the United States, we need separation of 0.8 MHz (at least) between most stations in large cities? How is it that LPFMs, all 10-100 watts of them, will cause "unacceptable interference" to second- and third-adjacent stations? Is there something about the laws of physics in America that is different from the laws of physics in these locations above?
I've heard the same argument in the past about analog TV and digital TV, and how a supposed advantage of digital TV was that stations could operate on adjacent frequencies, which was "not possible" with analog.
I beg to differ. In those above cities and many others, the entire VHF and UHF band was, and still is, packed from end-to-end with stations. In Italy, you have every VHF and UHF frequency in just about every region of the country occupied by a digital station, since they completed their switchover. Other countries are still in the process of switching over, and you see the analog VHF and UHF dial with stations, all adjacent to each other... on channel 21, 22, 23, 24, 25, 26, etc. All at high power in most cases and again usually mostly from the same transmitter farms.
Here's the list for Rome, for instance: http://www.otgtv.it/lista.php?code=RM00&posto=Roma
I find it quite incredible that planes aren't falling out of the sky and consumers aren't returning their radio and television receivers back to the store in droves due to all this unacceptable interference! And that broadcasters are putting up with this! (I'm being sarcastic, of course)