FREQUENCY MODULATION - PART I - BASIC PRINCIPLES
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- čas přidán 23. 04. 2010
- FREQUENCY MODULATION - PART I - BASIC PRINCIPLES - Department of Defense 1964 - PIN 28398 - FUNDAMENTALS OF AM AND FM RADIO COMMUNICATION, HOW FM ELIMINATES PROBLEM OF ELECTRICAL INTERFERENCE, FUNCTIONING OF FM RADIO EXAMINED IN DETAIL.
I have been taking an electronics communications class and i am quite surprised at how quick and easy this video describes material that my book and professor took weeks to convey. Pure awesomeness!
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Are walkie talkies in the FM range?
@@keylanoslokj1806it depends, but most use FM on VHF and UHF for FRS and GMRS.
@@keylanoslokj1806yes. Radio 85-105. Hand held radio 120-160 as far as I have heard on air.
This is hands down the best explanation for this topic
Ya I have to admit there are auditory learners, visual learners, and mechanical learners. When information is presented to me in cheesy silly animated diagrams and the like almost exactly in this video's format, my brain just gobbles it up like a steel trap.
+Matthew Holevinski Cheesier the better in science!!
Everybody likes cheese
This is the most beautiful explanation that I ever saw
Thanks a lot for sharing
12:40 best depiction of FM that I've ever seen.
Excellent!!! Not a single equation used. This is a great intro before diving into the horrible unpleasant math of it all.
Lmao
Good stuff. Amazing graphical presentation for 1964. I can't begin to imagine the amount of time spent on producing this for it's time period.
Wonderful! Since 1964, they had so good training way!
Absolutely beautiful.
Even in 2022 many people cannot use Microsoft PowerPoint to illustrate things with this clarity that this video shows.
I don't think PowerPoint is made for moving mathematical curves. That's just good for business/finance/etc. presentation.
Well, in 2022, there is incentive to monetize and keep peoples attention making actual information is increasingly more difficult to find.. The whole population wants to monetize a YT channel. How are channels profitable..?
I've understood AM radio for 20 years and have never been able to get a handle on FM regardless of how much I read about it. It's crazy such an old film would make it so simple and so clear. Sadly it makes me wonder why America has lost it's place as a technical leader. In the '40s we were so far more advanced than 99% of the other countries. Today I'm guessing we are in the 50th percentile.
This is absolute gold. thank you so much for uploading this video. Such great animations & clear concepts explained in simple english.
Big up FM!! 50 years worth of technological advancements and you're still about! A bit of noise on the radio signal is better than no signal (DAB)!
Oh after 55 years, that video explained me am fm modulation very well. That's the success.
CZcams University!
The best description, understood perfectly
Wow very good video. I've learned all of this stuff from books and classes but this is far better.
That voice and quotes are good for use in modern EDM music. Educational dance music ftw
This is really good. Thanks for uploading this video.
This is an awesome video! Thanks for uploading this!
Great study material, thank you for uploading. This helped me with studying for my amateur radio license
The best description I have ever seen.
Very good explanation, old films are the best.
This is very helpfull video
The bomb. Very good description.
old is gold , a beautiful way to understand things, if you have all the electrical videos please upload it.
Good illustration ... thanks
Cool way to learn...
this changed my perspective .....
This is brilliant.
Please upload the frquency modulation part 2 . These are very intresting lecturers
well explain and easy to undestand :D
Great explanation
Omg i have been sent back in time,, i was sent here by a modular synth ,,,,,,,,,,
Modular synths are awesome :)
this is so magnificent.
very very helpful !!
great video...thanks a lot!!!!
This really help for my report. :)
@jfdonnald If you're talking about the part where the audio wave is rotated vertically, it's just showing the direct effect of changes in amplitude in the input audio wave to changes in frequency in the carrier wave. Remember, the carrier's frequency is represented by the black horizontal line, and movement along that line only changes the frequency.
great !!!!!
Gootra love the Loony Tunes style intro.
NEED: Part 2!!!! :)
2023 and learning from a blk n white film🎉🎉🎉❤
I wonder what things we'll get to learn when modern Air Force data gets declassified.
Great video and cycles is a much better name than Hertz.
@msingletary1984 something called a piezoelectric material is used. this creates electricity when it is compressed or released. when hooked up to a microphone so that sound is turned into mechanical movement these properties can be used to make an electrical signal. no electricity source is needed, however a source is need to power the occilator as you have probably noticed that it has no actual input.
@TheKrazykool809 I knew about them but I hadn't even considered it. Thank you!
Thanks a lot.
@rafafull You are correct. The example showed amplitude changes in the carrier - or either both of us are misinterpreting the video.
deleted scenes from fallout 4
George Rivas lol
khargak ya ayyoubi :P
Thankss re bhava
cool
I am an operations manager at a Christian radio station and these things had always been so confusing, even after watching so many vidoes. This is so helpful in clarifying every one of my questions! I'm going to watch it through a few more times to really sink it home. Thank you for posting this as it will literally change my life and will change my coworkers as well who interact with these principles! Thank you Thank you Thank you!
haha this is so old that they are calling hertz cycles XD. Anyways, very helpful for an RF newbie :D
I know I’m late but Hz is one CYCLE per second so I mean tomato tomada.
@@jakepalmiero4293 1Hz = 1cycle/s, that is true.. but it's funny to me how probably back then Hz wasn't a very established standard, so they would just invert it and talk in cycles. Nobody talks in cycles anymore hehe
👌
Wow
very good video, can i have the AM video to this?
أعجبني
Baap video
On FM synth the modulating frequency follows the oscillator
Your LFO have to follow keytrack 1:1 in order to do that
How far we have come, now this can be done on a single chip!
old is gold
Doppler effect applies, but it is negligible because EM is going at the speed of light. See Blue shift, Red Shift
I'm pretty sure the frequency of the music at the beginning of this clip just destroyed all of my speakers
I could be wrong but I would say that the microphone doesn't create the electrical signal. Power must be sent to the microphone for the microphone to create distrubances in (this is the signal).
Can you replicate fm synthesis by simply using an lfo to modulate pitch?
is mega cycle the non-iso / american way to say Hertz?
Little did people know that FM synthesis would become a thing and would be responsible for the Yamaha DX7 and the Yamaha 2612 soundchip in the Sega Genesis.
like
is there a part 2? can someone help me find it. big thanks!
so for example 40 MC is the same as 40 MHz right?
They didn't call frequency units Hertz, because Hertz was a German physicists. :P Instead they called them cycles. This was recorded in 1964 and SI was established in 1960.
Was this recorded with a toaster?
The film is old created before cycle was renamed Hertz to honor the man, when all the world used the term cycle in this context
The secret Sytrus manual 🤔
at 8:14 what unit does the y axis of the audio signal represent, volume?
Alex Gamota yep!
Thank you, but I guess you're a bit wrong also. Hertz is actually cycles per seconds, so my first question is somehow stupid. And Hertz was SI standart from 1960 - 4 years before this was publicated.
Oups
hhhhh an error occured !! Study well you are going to explain for me :D
where is Part 2?
and now we do with FM the WUBWUB and DUBDUB and WEEEAAAU SCREEEEEEECH. D-D-Drop the Base!
in an FM signal you have a limiter to limit the amplitude so how does the demodulator work once the limiter limits the signal to certain amplitude???? why cant all those tutorials be explained like this i wonder
14:35 he mixes up frequency whit amplitude.the frequency deviation is at 100% at its maximum,not the amplitude.this is frequecy modulation after all.unless im missing something.
I know that am commenting to an old comment. Initially I also had the same point as yours, but later understood the point he makes in the video is correct.
Amplitude variations manifests as change in frequency therefore high +ve amplitude results in high frequency and -ve amplitude results in low frequency, this can be understood at 07:40.
T2B05 @ 12:24
frequency modulation - part 2 - basic principles
/watch?v=hoDkblpA4G0
That a film on FM is barely audible because of the static is highly ironic.
The doppler effect applies only to sound waves - not EM
Tim Deignan not actually true. Galaxies that are moving towards ours are said to be “blue shifted” and galaxies moving away are “red shifted”. It is negligible for these purposes, but to say it only applies to sound is actually incorrect.
What? no 1080p?
I came here because I want to learn FM8 ...
"FM radio is not a miracle." Well, for me it still comes a some kind of witchcraft.
Electronics, semiconductor physics, its all in the transistors, that's where the magic is stored..
"Hertz" is the American way to say Hertz.
An entire month of college in half an hour.
pipipi el unico español.
it's the same video bro!!
⭐⭐⭐⭐⭐❤🌷✅☑☑✅
RIP the eardrums of headphone users
Where is part 2
Not true. The Doppler effect also occurs with radio. The effect is less but still very real, and can be a problem for satellites which orbit very quickly.
Nice point. The doppler effect can be heard even in sound waves. Listen to a car approach you vs receding from you and note the shift in frequency.
its a good movie, but i dissagre when he talks about the rest frequency and the deviation in FM. The deviation is not about the amplitude of the signal, but the frequency
Rafael Sartori I know your comment is old, but this video has fascinated me and I’d like to attempt to explain my perspective for anyone else stumbling upon this.
The deviation is about both amplitude AND frequency. Remember, one cycle (or Hertz) will cause the frequency to go both above and below the rest frequency. How far it goes above and below rest frequency (modulation) is what affects the amplitude of the sound wave.
The illustrations towards the end of the video are confusing because they are showing the amplitude of the wave changing with respect to the rest frequency, even though we can not. visualize the frequency of the input wave (RF) changing.
I know that am commenting to an old comment. Initially I also had the same point as yours, but later understood the point he makes in the video is correct.
Amplitude variations manifests as change in frequency therefore high +ve amplitude results in high frequency and -ve amplitude results in low frequency, this can be understood at 07:40
Can someone add English subtitle for non-native english speakers?
Im no native too but dont need subtitles
@@christostsatsaris8185yeah well there may be two people, one's level of English is B1 (Intermediate) and the other's - C1 (Advanced). They both are not natives but the second still knows it better and can understand more by hearing. So yeah, subtitles would benefit all non-natives