It has functioned essentially unchanged and simply no longer fits well. As a median, you can’t compete effectively, your audience is shrinking, the economy is bad, and in the long run, it’s probably best to shut it down and move on with criticism and admiration. Curmudgeon is trying to do that.
Under the FCC’s mandate, dual-band AM-FM consumer radios have been supplied to the United States for decades. The entire United States has access to the FM frequency to be transmitted; everyone appreciates the inherent quality advantage of FM (stereo). 해외스포츠중계 declining market share and limited software portfolio demonstrate this fact.
AM radio signals have already spread to sparsely populated rural areas, bringing news and entertainment to isolated rural communities. The existence of dozens of nightly “clear channels” for the regulation of AM stations ensured that the whole of America could be “connected” to large population centers in a way that was never possible.
Delete channel AM unit settings are now lost.
Almost every city now has its own FM station or can receive services from a nearby city. Satellite radio can send signals almost anywhere on the American continent, offering the operator more programming and diversity than the entire AM transmission band. The Internet can offer a dizzying array of global radio broadcasts.
What is the current state of AM? Let’s look at the engineer first. There may have been no significant improvements to the main transmission system in 75 years. Its old technical limitations remain: limited bandwidth for audio frequencies, uninterrupted reception and the technical nightmare of spectrum management due to the spread of the ionosphere at night. There is no FM band for VHF broadcasts.
And there’s little hope for future AM improvements.
Well, there’s the AM HD program (ie IBOC). True, this saves some differences in FM performance. However, IBOC, as practiced today, actually requires 20 kHz channels (reserved bandwidth); Just look at the spectrum analyzer to see for yourself. Therefore, if you want to “save” the AM band with IBOC, redesign the entire frequency band for a 20 kHz channel raster.
From an economic point of view, AM FM cannot compete with the music programs that make up the majority of broadcasting areas. All AM shows now offer (usually) news / sports / chats. And all of these formats definitely work just as well with FM. There is nothing unique about AM programming. Amos and Andy and the big nets are gone.
Here’s the thing: we don’t need AM shows anymore!
We can do this pretty well with FM radio / satellite terrestrial Internet. So, how many tears are coming to his desk, Curmudgeon says, “Sunset!” We will choose a date, perhaps in 15-20 years, where we will turn it off with great nostalgia and noise. The future end of terrestrial television should be treated in the same way.
And many of the same design points apply to AM radio at sunset as to terrestrial television. Existing broadcasters should receive a tax credit for accelerated depreciation of the value of their broadcasting equipment and licenses. They also expect beautiful surprises from the possible sale of escort locations around which communities have grown. Now these are very valuable plots!
But what about continuing to plan for them after sunset?
Unfortunately, technology helps! Its programming, news / sports / voice channels are quite well suited to the city’s VHF-FM stations with HD-2, HD-3, etc. channels. In fact, in one major city, at least one AM news station has already started broadcasting its entire main program on the company’s FM-2 FM station in the same city. In fact, everything worth saving goes into FM HD.
Finally, if we have “unleashed” more than one megahertz on the middle spectrum, what the hell can we do about it? This question required the thinking of the ancients
