Highly edited version of US Army training video (TF11-3482 - Frequency Modulation Part I: Basic Principles, 1964) on the basics of FM transmission. This also shows how AM works. For educational purposes for my students.
I was expecting a video by prominent modern educators on RU-vid like Veritasium, Smarter Every Day or Khan Academy but it turns out that the best explanation I've ever seen on the topic is by a video made decades before I was even born
***** Making videos with great analogy and animation was pretty hard back then and still is now, but it's relatively easier to make. Notice that this video was made by the US military. I'm guessing only they could convince animators back then to make such videos. =P
These old training videos often surpass our modern multimedia productions. This is an example of the high quality instruction products of the past. Easy to follow, clear and well illustrated. Good stuff!
Modern audience would have a really hard time sitting through this because it is too long and explains EVERY little thing. It is good and bad at the same time. A modern multimedia educational content would have summed it up in less than 5 minutes, however it wouldn't be as magical.
@@GamePois0n Not less intelligent but less patient, we want everything to be fast and easy to digest. That's why we have TikTok-like video feeds being so popular.
Tuppoo94 exactly!!!! Never seen a video with crystal clear explanation like this one. Other videos just explain conventionally like u know withe mathematical terms and stuff. But this is next level explanation. ...
I am an instructor at a US Army school and we love using this video. It still works for the basic understanding level and the students get a kick out of a space race age video.
This is a very good (and still relevant) film! I "always" knew how AM worked, And had an idea about how FM worker, But this EXPLAINS it. Decades later, FM is still ingenious! Armstrong was a genius! First, he gave us Superheterodyne, and later FM.
I am compelled to say how wonderfully clear this video is on AM and FM modulation. I saw a few modern explanation videos before watching this. Those other ones were impossibly wordy and lacked in clarity. Thank you !
Really excellent explanation...which I really need right now. Thanks for the posting. I'll hit it a few more times over the next few days until its all sunk in.
If you know FL Studio, you can recreate the same thing in Sytrus, it is pretty interesting to hear! You can individually listen to the "coded" (modulated) and the original signal. Use a Wave Candy to visualize the whole thing.
I want this guy to teach me everything about every machine. Today people are too worried about their personalities and asking you to subscribe in between
Modern FM is a good deal more complicated than described here. The carrier is also modulated with subcarriers to carry stereo, SCA and RDS data. Many stations also transmit digital carriers for "HD"-channels although they are separate from the FM carrier.
Cool thing to do, Take the audio, put it in audacity, use the noise reduction by sampling the noise and then apply the reduction to the rest voila! It actually sounds good! Modern tech is awesome!
Correct me ASAP if I am wrong: the electric signals are travelled into the transmitter where they are converted into radio waves. The conversion is done because of a process known as modulation whereby the amplitude of the wave is modified. Those waves are then known as carrier waves just because now they have modified amplitude. Those carrier waves travel through the antenna and later on reach the radio's antennas. Right? If I am right then when are the radio "waves" actually made because isnt modulation when an existing wave is modified? So it's pretty obvious that the waves were made before modulation but how exactly? Plz help I have an assignment to submit. Thanks
I did a one year long crash course in electronics for computers in 1979 (I was 6 months old when I took the course) at Career Learning Center in Toronto and this video brought all of that information rushing back. This great video, without intending to do so, explained single side band modulation too.
Is that Bing Crosby narrating this video? While I like the Voiceover guy that goes the voices for all those talk sports stations, I think this voice would be awesome for a serious news station like WINS or WCBS. By the way, the guy who does all those voice overs, has air checks of him doing top 40 radio in the mid-80s in Boston. I think it was WKKS?
I don't know about this specific training film, but the US Government used to contract out a lot of animation work to Disney and Warner Brothers (the infamous Private SNAFU cartoons were made by WB). So, it is entirely possible that this training film came from either the House of Mouse, or Bugs Bunny land (the narrator even sounds similar to the one Disney used for the True Life Adventures series).
I have my spiral bound copy of "An Inquiry Into Things Enigmatic". Nice to see you are still educating the unwashed masses. {former grunt for moses}. For those of you who think tech is for nerds, I can assure you that Dana's wife is the most beautiful woman I have ever seen. There I said it. We all worked in the same place in the 90s...
Is 7:30 not incorrect? They mix up amplitude modulation with frequency modulation. Changing amplitude does not change the end signal in FM (they even filter amplitude variations later in the receiver).
No, it is correct. I think you might be misunderstanding the graphic. What it is illustrating is that higher amplitude of the input signal leads to a larger deviation from the rest frequency in the output signal. Its amplitude, however, is irrelevant, as you say.
I suppose the guys (in 1964 by the way) who were not interested in electronics may have been uninterested...but I’ll bet a bunch of people learned a lot because they watched this little film.
not really (at least I don't think so). Limiter when used drastically introduces its own artifacts like distortion which in effect is similar to hash itself. Now that won't be a problem in FM receivers since it only decodes data from the frequency information and the limiter only gets rid of the peaks. Even then the limiter is used only with certain preset settings so as to minimize risk of distortion since it's capable of adding additional harmonics meaning introducing frequency content, which is dangerous in FM. Here its only used to clip off the peaks and keep the signal uniform cuz what matters is frequency not amplitude.
Sorry if i'm being stupid, I have my Electronics college exams coming soon, and am scratching up on some things learned a few years back, I assume that by "Kilo-Cycles" this also mean Kilo-Hertz? And vice versa for Mega-Cycle = Mega-Hertz?
Eric Mason Just google the title I have in the description for the full version. I believe it's basically in the public domain, as this was a US government film, and those are released...
