Justin This my friend is a subject in any Communication Theory / Signals course. I just went through the course last semester as a 3rd year Electrical Engineering major and I gotta say it is so interesting but sadly I have almost no clue where to apply the subject. Most of the course explains what you see in test equipment such as digital oscilloscopes. When I saw the thumbnail I was like "What the hell did I watch that to help me in my homework or something" 😂 but it's on trending!!!
Thank you. I searched around and began to think that all RF engineers were all Indian. Wonderful people, but I have a difficult time with the extreme accent most have when trying to teach. Thank you for presenting in a way I could readily understand without having fight through the language... Math is hard enough without having to decipher the accent too. Also the o scope really helped.
Very enjoyable, and technical video that gets to the point showing not only the why it works, but how it works. No guess work here, folks. This guy is the real deal.
Sorry it took me so long to find this. The topic is timeless, your presentation of such a difficult concept is amazing. Thank you. More than 50 years ago, the Navy did their best trying to teach this topic as part of my Avionics training prior to deployment in Vietnam. It's a good thing I didn't really need to know it, as I just now really understood for the first time. Thanks again.
Thanks for this, it helped a lot. I could never figure out why the sidebands were there, why the hell would messing with the amplitude impact the frequency? Expressing it as cos(a)cos(b) = 1/2 cos(a+b)cos(a-b) did the trick, it is especially clear if you plug that into a graphing calculator.
Incredible! This is way better than anything the ARRL has which tries to explain SSB. I recommend anyone studying for the general exam view this video. Thank you.
There are so many poor explanations of side-band, definitions, generation, and demodulation, that I just want to be clear on this; please let me know which parts of these statements are incorrect: 1- In AM radio, the demodulation of an AM carrier, into its original audio signal, is not dependent on side-bands? 2- Side bands are a natural result of the mixing of two or more electro-magnetic wave-forms? 3- In demodulating SSB, unlike AM, the audio heard after demodulation, is actually the resultant frequency difference between the carrier and the imposed audio? 4- Like AM, the amplitude of the SSB wave, determines the demodulated "volume"?
Hi and thank you for another what I would consider as a mind blowing video. You mentioned that in SSB the carrier and the other side band is suppressed. Is there any way to demonstrate that in the lab demo? I'd love to see what the "transmitting" signal looks like in the time domain (with those components removed). Is there any insightful way to show what happens when the carrier and the other side-band are suppressed by looking at the math alone?
This is a great question. Looking at the specs of several modern amateur HF transceivers, it appears that the unwanted sideband is typically suppressed 50 dB or more below the maximum output (see, e.g., www.kenwood.com/usa/com/amateur/ts-590sg/spec.html), so the signal level should be quite low. I've heard people talk about signals on the air where the suppressed sideband is audible, though I've never looked for that to tried to hear it. Those cases are probably due to very old or poorly designed transmitters. The suppression of one sideband relative to the other should be measurable using a spectrum analyzer, though care is obviously required. The w2aew channel has an excellent video that shows SSB in the time domain, ruclips.net/video/3DxBg6h4Fc8/видео.html.
Thanks for the excellent vid. The math is a bit beyond me, but I got the idea. Can you answer one question for me in the simplest terms: Why does the pitch of the voice you hear on an SSB signal rise or fall as you move away from the carrier frequency? I'm figuring that it is the sum and difference between the received signal frequency and the tuned (VFO) frequency which adds or subtracts to/from the modulation. so if you move the receiver VFO 100Hz higher for an LSB signal, the modulation will rise in pitch by 100Hz, while for a USB signal it will fall 100HZ, and v/v for moving the VFO lower in frequency.
I have always understood the relationship between the carrier frequency and its sidebands, but in 40 years of dealing with it, I've never thought about the math behind it. The FFT demo was great on the Rigol, what model is it? I look forward to more videos like this.
Please show the difference between, say, a single tone modulated 100% modulation AM signal and an SSB single tone modulated signal (all frequencies the same) IN THE TIME DOMAIN... what would be the difference? (in the time domain)
I know! It came as a total surprise when I checked the channel statistics. After some checking, I found that Hackaday picked up the video, and the ARRL FB page did, too, a few days later. I'm pleased so many people found the video helpful.
The content of the video is very interesting and the delivery of the audio is great. What ruined it for me was the (poor) handwriting on paper! C'mon, there are free maths programs that will make the presentation look MUCH more professional. The paper thing was so distracting I could not finish it. FWIW, my handwriting is much worse.
Thanks for the comment. I'm sorry you couldn't read my handwriting. Typesetting the algebra and notes in LaTeX or some other package is indeed possible and I might do that at some point, but for now I'll just write more neatly.
Don't know what this is, but it's on trending and I clicked on it. Learned something new. Thanks
Justin This my friend is a subject in any Communication Theory / Signals course. I just went through the course last semester as a 3rd year Electrical Engineering major and I gotta say it is so interesting but sadly I have almost no clue where to apply the subject. Most of the course explains what you see in test equipment such as digital oscilloscopes. When I saw the thumbnail I was like "What the hell did I watch that to help me in my homework or something" 😂 but it's on trending!!!
Same !! Lol
That made my day!
Thank you. I searched around and began to think that all RF engineers were all Indian. Wonderful people, but I have a difficult time with the extreme accent most have when trying to teach. Thank you for presenting in a way I could readily understand without having fight through the language... Math is hard enough without having to decipher the accent too. Also the o scope really helped.
Very enjoyable, and technical video that gets to the point showing not only the why it works, but how it works.
No guess work here, folks. This guy is the real deal.
Tried reading about SSB but I never got it. This made it much easier to understand! Thank you!
Sorry it took me so long to find this. The topic is timeless, your presentation of such a difficult concept is amazing. Thank you. More than 50 years ago, the Navy did their best trying to teach this topic as part of my Avionics training prior to deployment in Vietnam. It's a good thing I didn't really need to know it, as I just now really understood for the first time. Thanks again.
A neat description of the theroy plus the demo of USB, LSB and SSB, thank you very much.
Thanks for this, it helped a lot. I could never figure out why the sidebands were there, why the hell would messing with the amplitude impact the frequency? Expressing it as cos(a)cos(b) = 1/2 cos(a+b)cos(a-b) did the trick, it is especially clear if you plug that into a graphing calculator.
Incredible! This is way better than anything the ARRL has which tries to explain SSB. I recommend anyone studying for the general exam view this video. Thank you.
Thanks, I'm glad you found it helpful!
I look forward to a future video that you hinted to about how the carrier and one side and are removed.
There are so many poor explanations of side-band, definitions, generation, and demodulation, that I just want to be clear on this; please let me know which parts of these statements are incorrect:
1- In AM radio, the demodulation of an AM carrier, into its original audio signal, is not dependent on side-bands?
2- Side bands are a natural result of the mixing of two or more electro-magnetic wave-forms?
3- In demodulating SSB, unlike AM, the audio heard after demodulation, is actually the resultant frequency difference between the carrier and the imposed audio?
4- Like AM, the amplitude of the SSB wave, determines the demodulated "volume"?
Very good presentation. I especially liked the theory followed by a practical demonstration.
One of the best explanation of SSB. And followed by a nice demonstration. Superb. Thanks for that and God bless you
Thank you for this clear, concise explanation and demo for we the math challenged!
I absolutely stink at math, but I could follow along and for the first time I understand AM vs SSB! You sir, are a hero. Thanks!
Thank you!
Explained very well,l have reached here after watching many channels ,this was best....
This was so enjoyable to watch! It's a pleasure to see this worked out with such clarity.
I found this extremely useful. Thank you for putting this video together.
Very nice, not being adept at RF stuff I enjoy your videos.
Excellent description. Keep up the good work 👍
Thanks, this was great. I'd also love to see a demo of what different modulated ssb signals look like in a waterfall display (and why).
Thank you for this excellent explanation. I look forward to your future videos..............................Berni
Hi and thank you for another what I would consider as a mind blowing video. You mentioned that in SSB the carrier and the other side band is suppressed. Is there any way to demonstrate that in the lab demo? I'd love to see what the "transmitting" signal looks like in the time domain (with those components removed). Is there any insightful way to show what happens when the carrier and the other side-band are suppressed by looking at the math alone?
This is a great question. Looking at the specs of several modern amateur HF transceivers, it appears that the unwanted sideband is typically suppressed 50 dB or more below the maximum output (see, e.g., www.kenwood.com/usa/com/amateur/ts-590sg/spec.html), so the signal level should be quite low. I've heard people talk about signals on the air where the suppressed sideband is audible, though I've never looked for that to tried to hear it. Those cases are probably due to very old or poorly designed transmitters. The suppression of one sideband relative to the other should be measurable using a spectrum analyzer, though care is obviously required. The w2aew channel has an excellent video that shows SSB in the time domain, ruclips.net/video/3DxBg6h4Fc8/видео.html.
Thanks for the excellent vid. The math is a bit beyond me, but I got the idea.
Can you answer one question for me in the simplest terms: Why does the pitch of the voice you hear on an SSB signal rise or fall as you move away from the carrier frequency? I'm figuring that it is the sum and difference between the received signal frequency and the tuned (VFO) frequency which adds or subtracts to/from the modulation. so if you move the receiver VFO 100Hz higher for an LSB signal, the modulation will rise in pitch by 100Hz, while for a USB signal it will fall 100HZ, and v/v for moving the VFO lower in frequency.
I have always understood the relationship between the carrier frequency and its sidebands, but in 40 years of dealing with it, I've never thought about the math behind it. The FFT demo was great on the Rigol, what model is it? I look forward to more videos like this.
Very interesting and useful for someone like me who is getting into RF.
I really like the combination of the math and demo...reminds me of Alan W2AEW's channel....you have a new subscriber! 73 - Dino KL0S
Thanks, Dino, that's high praise indeed! 73 -- David, WQ7F
Please show the difference between, say, a single tone modulated 100% modulation AM signal and an SSB single tone modulated signal (all frequencies the same) IN THE TIME DOMAIN... what would be the difference? (in the time domain)
Very nice. Now you can do a whole series.. Phase Modulation, BPSK, QPSK, OQPSK, QAM-16, etc ;-) !
There's an idea!
So how is it done in practical terms then? That's what I actually wanted to know....
Can I have a copy of your notes please?
Thanks. I need to get a digital scope.
As a follow-up, have you looked at this project from HaD? hackaday.com/2015/09/22/a-better-spectrum-analyzer-for-your-rigol-scope/
I thought ssb ment super smash brothers
Trending
I know! It came as a total surprise when I checked the channel statistics. After some checking, I found that Hackaday picked up the video, and the ARRL FB page did, too, a few days later. I'm pleased so many people found the video helpful.
The content of the video is very interesting and the delivery of the audio is great. What ruined it for me was the (poor) handwriting on paper! C'mon, there are free maths programs that will make the presentation look MUCH more professional. The paper thing was so distracting I could not finish it. FWIW, my handwriting is much worse.
Thanks for the comment. I'm sorry you couldn't read my handwriting. Typesetting the algebra and notes in LaTeX or some other package is indeed possible and I might do that at some point, but for now I'll just write more neatly.