I agree with all you other positive reviews; Probably the best explanation anywhere. I've watched a half dozen videos and read just as many articles and everyone of them either leaves something critical out, uses confusing wording, or just can't break it down the way you do. I'm thrilled to be subscribed to your channel! Thank you.
this must be literally the best explanation for IF. thank you! The fact that you actually demo'd it on actual Radio + Osciloscop (or spectrum analyser - whatever it was) was really a bonus! thank you again!
Alan, I've spent the last 8 months immersing myself in tube radios, upgrading my license, etc and your videos have been extremely helpful. In some way you've answered most all of my questions. However, I was about to ask you for a video on heterodyning and you beat me to it! Very good video. I have done a fair amount of work on the Halli S 85 which uses the sum of Fn and Fo for most of the bands in the IF chain. I've learned that I can check the Fo+Fn by using my TinySA and almost touch the antenna to the 3 gang tuner LO section or the feed wire inside the chassis. There I can see a peak that represents the sum of the 2 frequencies and how close it is to the tuner dial, minus the IF. It's a great little gadget for troubleshooting tube radios, which is all I work on. So with 455Khz IF, most of the broadcast band, for example, will be higher freq than the IF so summing will be used, correct? Or, do some radios using a 455khz If use the Fn minus Fo? Also, so if I understand this right; in the S-85, the combined 455 and Fn are fed into the IF filters that allow only the 455 to pass through, however the 455 maintains the AM modulation (fingerprint) presented by Fn when the two freqs were combined in the mixer. My question is how does the modulation not get corrupted in the process of going from the Fn to the IF? Seems to me the fidelity of the original modulation would be reduced when going from a higher freq Fn, say 1.2Mhz (consider the freq a sort of sampling rate) when down converted to 455Khz? Just not noticeable? Or do I misunderstand this? Thanks for another great video.
As I said in the video, some radios use high side injection (local oscillator above the frequency of interest), and some use low-side. Most high-side injection schemes that I've seen use the difference between the local oscillator and input frequency. The whether high side or low side is used, or whether the sum or difference is used, will have no bearing on the modulation quality - there will just be spectral inversion in the case of F(lo)-F(in) schemes.
Yep, I saved up my lawn-mowing earnings during one summer in the mid/late 70s to buy it, after lusting over it in the catalog and my local Radio Shack store...
@@w2aew The 60s and 70s era radio shacks were engaging and thrilling with all of the technology and possibilities. Hard to adequately describe the effect.
@@microreniassance2929 Yes - I spent many hours in Radio Shack in the 70s - and poured through every page of the catalog each time a new one was published.
I came to this video from your response to a written description on X. When I read it I was thinking, boy this would be really super if there was an illustration or animation of the flow of signals through the receiver. BAM, w2aew to the rescue!
And just like that you showed me how IF works in one small drawing after struggling with it for years. Even all my three different amateur radio curriculum books failed to get through to me that the purpose of mixing with a changeable IF was to shift the product into a fixed filter. Thanks! (No, I have not taken the license yet. I demand of myself that I understand the topic before I take an exam, not just rehearse it from a book)
This video was perfect. I mean I already had the idea of how it works, but didn't encounter a video that perfectly explains it before. You can SEE all the stations with that oscilloscope thingy. If only this is how everyone explained it instead of complicated words and maths.
Hi Alan, Awesome video. Never heard the principal of a superhet receiver circuit explained in such an easy to follow manner. The traces really show the spacial inversion effect during tuning. You and the family stay safe. 73 WJ3U
Thank you for this. It must feel great to have the best ham radio site on the RUclips -- Bravo!!! I knew this stuff as an extra class amateur, but this is a masterful review. If only my teachers could have had such love for science or been capable in communicating.
i am taking a new position as a satellite dsp subsystems engineer(this will be my first job in comms). I'm about to binge watch all of your videos....... =D
@QueHubo Parcero going to college after 2010 is like buying a horse and carriage for a quarter million when RUclips is handing out lambos for free. I have an EE degree and I'm ashamed to admit how much it cost me
This presentation would have been fantastic to have 40 years ago when i first got into radio receivers. Thanks for the great presentation that reminded of those great days of "wireless".
Thank you , I couldn't follow some of the other explanations on RUclips. But your explanation, especially the diagram at 5.35 or thereabouts is brilliant. My brain felt easy after your explanation. Thank you and God bless you.
Very good explanation & presentation Alan, thank you! I was already well familiar with all of these concepts but one never stops learning and I learned a couple of things. Bravo!
Never did understand Super regenerative receiver in the Heathkit Twoer, my first ham rig. I love your presentations, I had some of this knowledge 40 years ago. W5SLW
My Dad was a radio-ham (G3TNO), but I never got into it. I knew that super-heterodyne receivers had a local oscillator and mixer, and even that the IF was used to get the audio out, so to speak. But, I never understood why such a complicated method would be used, until today. You gave a brilliant explanation, and demonstration. It seems so obvious now.
This might be an old receiver but they knew how to build a good receiver back then. Thanks for the explanation as always its fun and interesting to learn from you.
What happens to the input when the LO is turned down? Why is the main signal spectrum(in the top most) going away? It shouldn't right. It is indeed one of the best explanations of the concepts!
Thank you. Very interesting and well communicated. The scope view of each stage really helps to explain the process. Classic shortwave radio from the late 70s/early 80s.
@@w2aew Haha that's exactly it, don't forget the nice voice and warm lighting as well. I hope you have endless success in every aspect of life. God bless
Recently I was able to purchase the same Sharp SW radio I was given by a Ham back in the mid 1970s when I was a young boy. First thing I did with the new radio was beat frequency the 40m Ham band with another AM radio so I could understand the strange sounds of someone talking. The things you learn along the way. :) Many thanks Alan.
As part of my microelectronics course, I had to build a superhet based radio using only transistors, diodes (including varactors), and passives. We didn't design anything, just did the math to determine the values for the components in each block of the signal path. Even after explanations, doing all the calculations, building, testing, and it actually working, I didn't fully understand what was going on. Until now that is. Fantastic video, super clear demo that just nails it. Keep up the fantastic content!
Thanks for the video. The way you showed what is happening on the scope really made it sink in for me. I have loved electronics since I was a kid but never had any formal education in it. I am retired now after a career in computer software development, mainly in the medical field. Now I am enjoying my Ham hobby and learning more about radio. I will look forward to your next video. 73 KF4UPI
very nice. i work for a company that makes very high end transmitters and recievers. You would think they would have decent explanations for concepts such as this. nope... This is vastly more useful than the series of vids theyput out for their employees. Thanks for posting it
this with the spectrum analyzer display and explanation is pure gold!!!! i never had that type of equipment to play with it makes learning so much easier as many are visual learners not bookworms. thats probably why i veered away so many years ago to do other things.
Best explanation ever! Something as ubiquitous as radio should not be such a mystery. It is not magic. Thank you for helping me to understand how it works!
Excellent visualisation of the fundamental concepts. This approach makes appreciation of what are otherwise rather abstract ideas very straightforward and easy to remember. Y
Wow! I have never really understood the this process and I have wanted to forever. This makes it SO much clearer! Adding the last part to actually SEE the signals and se them move is the key! Excellent work and I can't thank you enough for this explanation!
Probably the best representation of a superheterodyne out there. Thank you for the video and the show notes. I keep a hard copy of your notes in a folder because they are such a great reference for me.
Super-helpful! The more of your videos I watch, the better I actually understand the dry, few paragraphs in my amateur licence textbooks. This one is particularly good. I am building a simple DCR right now but hope to work my way up to building a Super-Het.
Thanks Alan. You landed this video right on my birthday -- Awesome present! Headed to the bench with an old AM radio to replicate your super-het demo. Too cool.
I love your videos on specific electronics basics and advanced topics. When I see that notepad come out I know I'm about to learn something! Thank you!
Excellent video as always. I know the theory, but, it's always a pleasure to see it explained in such a clear, concise and graphical way by a very knowledgeable coach
Well done. Thank you for having the graphs ready ahead of time and showing the process in action on your receiver. I am studying for my HAM licence and seeking explanation for some concepts from videos such as your video. Thanks too for your insight on the oscillator (being the tuner) and moving the frequencies to the ones of interest. Once again, Well Done!!
That is really great to hear! I hope the videos help a lot of students! What university is this? Do all the EE profs use my videos (they're more than welcome to!).
@@macuser1232 Oh, very nice! Believe it or not, I applied to VT in 1981, but didn't get in. I was #10 in my HS class. My Guidance Counselor was as surprised as I was, and told me that VT didn't take any out-of-state students that year. I was upset, VT was my first choice. Wound up getting my degree at NJIT instead. So ironic that my videos are now helping students there - awesome!
@@w2aew well, it took me two tries as an in-state student! Did a year at NCSU engineering before I transferred. Also a VT alum who is also a fellow ham is doing great things at NJIT currently.
I am working on my Armature Extra, so your video was informative. Thank you. I am still not comfortable calculating image responses, but I am going to keep working on them.
Brilliant work as always, always something new to learn, mixers are very interesting to understand and make, and to watch the final frequency arrive, the only problem these days are buying good quality components. Enjoy your videos very well done. Thanks for sharing.
I always suggest to young people to look stuff made in the 70s because at that time a lot of consumer electronics came with a thematic and it was possible to learn a lot about electronic by looking at the semantics. I was amazed one time to see that the call button on a walkie-talkie was using voluntary feed back of the audio amplifier to generate the call tone !
Wow, I love your videos already, but that was brilliant. Like others have said, I wish I'd seen this video when I first started learning about RF. Thanks again for the quality content!
Awesome video! It just occurred to me that listening to the radio would be much more fun if receivers came with built in scopes to show what you've shown in the video. It could also help tuning.
With and SDR you can see the spectrum of the signal you are listening to. Check out the RTL-SDR, they are about about the size of a flash drive and plug into a computer or tablet. You can get them for around $20.
@@rocketman221projects but that's the audio spectrum/waterfall display. It doesn't show anything about like the principles of superheterodyning what Alan showed with the spectrum analysis. De VU2RZA
I have that very same radio that I bought with my tobacco money in the early 70's (I started with the DX-150 and the next year added money to it and traded up for the DX-160 that had a FET front end that the 150 didn't have) Tootles... Wade
I agree with all you other positive reviews; Probably the best explanation anywhere. I've watched a half dozen videos and read just as many articles and everyone of them either leaves something critical out, uses confusing wording, or just can't break it down the way you do. I'm thrilled to be subscribed to your channel! Thank you.
this must be literally the best explanation for IF. thank you!
The fact that you actually demo'd it on actual Radio + Osciloscop (or spectrum analyser - whatever it was) was really a bonus!
thank you again!
Finally, someone has found a way to explain how a superhet receiver works in such a way as to make it past my very narrow band IQ filter. Thank you!
The moving scope trace is the clearest way of explaining this I have ever seen. Thank you :)
Alan, I've spent the last 8 months immersing myself in tube radios, upgrading my license, etc and your videos have been extremely helpful. In some way you've answered most all of my questions. However, I was about to ask you for a video on heterodyning and you beat me to it! Very good video.
I have done a fair amount of work on the Halli S 85 which uses the sum of Fn and Fo for most of the bands in the IF chain. I've learned that I can check the Fo+Fn by using my TinySA and almost touch the antenna to the 3 gang tuner LO section or the feed wire inside the chassis. There I can see a peak that represents the sum of the 2 frequencies and how close it is to the tuner dial, minus the IF. It's a great little gadget for troubleshooting tube radios, which is all I work on. So with 455Khz IF, most of the broadcast band, for example, will be higher freq than the IF so summing will be used, correct? Or, do some radios using a 455khz If use the Fn minus Fo? Also, so if I understand this right; in the S-85, the combined 455 and Fn are fed into the IF filters that allow only the 455 to pass through, however the 455 maintains the AM modulation (fingerprint) presented by Fn when the two freqs were combined in the mixer. My question is how does the modulation not get corrupted in the process of going from the Fn to the IF? Seems to me the fidelity of the original modulation would be reduced when going from a higher freq Fn, say 1.2Mhz (consider the freq a sort of sampling rate) when down converted to 455Khz? Just not noticeable? Or do I misunderstand this?
Thanks for another great video.
As I said in the video, some radios use high side injection (local oscillator above the frequency of interest), and some use low-side. Most high-side injection schemes that I've seen use the difference between the local oscillator and input frequency. The whether high side or low side is used, or whether the sum or difference is used, will have no bearing on the modulation quality - there will just be spectral inversion in the case of F(lo)-F(in) schemes.
One of the best explanations I've ever seen of a super-het -- I finally get it!
When I was 12 I fantasized over that DX-160. Excellent presentation of the frontend/ IF and IF filter waveform relationships.
Yep, I saved up my lawn-mowing earnings during one summer in the mid/late 70s to buy it, after lusting over it in the catalog and my local Radio Shack store...
@@w2aew The 60s and 70s era radio shacks were engaging and thrilling with all of the technology and possibilities. Hard to adequately describe the effect.
@@microreniassance2929 Yes - I spent many hours in Radio Shack in the 70s - and poured through every page of the catalog each time a new one was published.
I came to this video from your response to a written description on X. When I read it I was thinking, boy this would be really super if there was an illustration or animation of the flow of signals through the receiver. BAM, w2aew to the rescue!
I always come back to this video for a refresher. Thanks!
And just like that you showed me how IF works in one small drawing after struggling with it for years. Even all my three different amateur radio curriculum books failed to get through to me that the purpose of mixing with a changeable IF was to shift the product into a fixed filter. Thanks!
(No, I have not taken the license yet. I demand of myself that I understand the topic before I take an exam, not just rehearse it from a book)
This video was perfect.
I mean I already had the idea of how it works, but didn't encounter a video that perfectly explains it before.
You can SEE all the stations with that oscilloscope thingy.
If only this is how everyone explained it instead of complicated words and maths.
Very nice sir! Best youtube learning electronics channel in my humble opinion.
This great video should be in the standard lectures for Electronics Engineering!
Thanks
Hi Alan,
Awesome video. Never heard the principal of a superhet receiver circuit explained in such an easy to follow manner. The traces really show the spacial inversion effect during tuning. You and the family stay safe. 73 WJ3U
Thank you for this. It must feel great to have the best ham radio site on the RUclips -- Bravo!!!
I knew this stuff as an extra class amateur, but this is a masterful review. If only my teachers could have had such love for science or been capable in communicating.
i am taking a new position as a satellite dsp subsystems engineer(this will be my first job in comms). I'm about to binge watch all of your videos....... =D
How much did you pay for college now you're using a free service to hopefully not look dumb in a new position. This world is a joke
@@michveldvvid college gives you a foundation. As a non- electrical engineer, I can understand this
@QueHubo Parcero going to college after 2010 is like buying a horse and carriage for a quarter million when RUclips is handing out lambos for free. I have an EE degree and I'm ashamed to admit how much it cost me
@QueHubo Parcero if you need help with your pre med coloring book homework feel free to message me
Can you please tell me what skills and qualifications you needed to get this job? I want such a job too. Would appreciate any gotcha's and tips.
Dude. This is insane. I’ve struggled to understand this for years and you made it so clear.
One of the best channels out there for radio stuff. Super clever guy!
Amazing video for those who enjoy visual learning
This presentation would have been fantastic to have 40 years ago when i first got into radio receivers. Thanks for the great presentation that reminded of those great days of "wireless".
This would be the gold standard explanation of the superheterodyne principal for all EE students all over the world
Thank you , I couldn't follow some of the other explanations on RUclips.
But your explanation, especially the diagram at 5.35 or thereabouts is brilliant. My brain felt easy after your explanation.
Thank you and God bless you.
Love these basics on RF videos. Super exited. Today is a GOOD DAY.
OMG everything became crystal clear when you showed all of the stages on the spectrum analyzer!!
You have impressed me, with all those probes punching the receiver. Thanks!
Very good explanation & presentation Alan, thank you! I was already well familiar with all of these concepts but one never stops learning and I learned a couple of things. Bravo!
Never did understand Super regenerative receiver in the Heathkit Twoer, my first ham rig. I love your presentations, I had some of this knowledge 40 years ago. W5SLW
My Dad was a radio-ham (G3TNO), but I never got into it. I knew that super-heterodyne receivers had a local oscillator and mixer, and even that the IF was used to get the audio out, so to speak. But, I never understood why such a complicated method would be used, until today. You gave a brilliant explanation, and demonstration. It seems so obvious now.
This might be an old receiver but they knew how to build a good receiver back then. Thanks for the explanation as always its fun and interesting to learn from you.
A spectral picture paints a thousand words. Thanks for the excellent presentation. Gary VK6LX 73
What happens to the input when the LO is turned down? Why is the main signal spectrum(in the top most) going away? It shouldn't right.
It is indeed one of the best explanations of the concepts!
The best explanation I've seen in my 30 years in the business!
wow Mind-blowing demonstration nice
Best explanation of a superheterodyne I’ve seen yet. Great explanation of terminology. Thank you
And suddenly it makes sense how panadapters worked in the era before software defined radio! Thanks. 👍
I wish my labs were this cool in college... amazing explanation
Thank you. Very interesting and well communicated. The scope view of each stage really helps to explain the process. Classic shortwave radio from the late 70s/early 80s.
I always get a good cozy feeling from your videos, which I almost never get with other videos no matter the subject, what's the secret?!
Hopefully it is a result of a good "signal to noise ratio" of the content, and gaining an understanding of a topic after viewing.
@@w2aew Haha that's exactly it, don't forget the nice voice and warm lighting as well. I hope you have endless success in every aspect of life. God bless
Recently I was able to purchase the same Sharp SW radio I was given by a Ham back in the mid 1970s when I was a young boy. First thing I did with the new radio was beat frequency the 40m Ham band with another AM radio so I could understand the strange sounds of someone talking. The things you learn along the way. :) Many thanks Alan.
Thank you for your awesome explanation on how the superhet receiver works. I always had trouble understanding it. Until now.
Nice video and that's a nice receiver too. I'm glad to see that you've kept it all these years and that it's still in such good condition.
Perfect! Thank you the job done! Simple and great!
Super set up and video. So illuminating in one video all those plots.
As part of my microelectronics course, I had to build a superhet based radio using only transistors, diodes (including varactors), and passives. We didn't design anything, just did the math to determine the values for the components in each block of the signal path. Even after explanations, doing all the calculations, building, testing, and it actually working, I didn't fully understand what was going on. Until now that is. Fantastic video, super clear demo that just nails it. Keep up the fantastic content!
Really glad to hear that this video help flip on the light bulb!
A very good approach to intuitively understanding the dynamics of het reception!
Thanks for the video. The way you showed what is happening on the scope really made it sink in for me. I have loved electronics since I was a kid but never had any formal education in it. I am retired now after a career in computer software development, mainly in the medical field. Now I am enjoying my Ham hobby and learning more about radio. I will look forward to your next video. 73 KF4UPI
I have never seen such a good description, and I have watched many. Thank you!
If only this video was available a decade ago!! Would have made my life so much easier 🙂Thanks @w2aew
All smiles over here. That was great. I loved seeing the graphs as you tuned the LO to the strong signal. You are a gifted instructor, Sir.
very nice. i work for a company that makes very high end transmitters and recievers. You would think they would have decent explanations for concepts such as this. nope... This is vastly more useful than the series of vids theyput out for their employees. Thanks for posting it
Be sure to pass this along to your fellow employees!
Excellent demonstration using the four spectrum spreads, I've never seen superheterodyne demonstrated in this way!
Isn't modern equipment nice
This is gold. Thank you for making these videos
Ditto! Enjoyed watching. Thanks.
Please keep making video's. I'm not a EE and your explanations are very easy for me to understand. Thank you.
Best explanation of the superhet I've ever seen or heard. You deserve that silver play button and many more to come.
Very nice explanation sir.
this with the spectrum analyzer display and explanation is pure gold!!!! i never had that type of equipment to play with it makes learning so much easier as many are visual learners not bookworms. thats probably why i veered away so many years ago to do other things.
Best explanation ever! Something as ubiquitous as radio should not be such a mystery. It is not magic. Thank you for helping me to understand how it works!
Excellent visualisation of the fundamental concepts. This approach makes appreciation of what are otherwise rather abstract ideas very straightforward and easy to remember. Y
Wow! I have never really understood the this process and I have wanted to forever. This makes it SO much clearer! Adding the last part to actually SEE the signals and se them move is the key! Excellent work and I can't thank you enough for this explanation!
Thank you so much, You have a real talent to teach something that most can’t seem to explain.
Excellent explanation, thank you! I've never quite grasped the functioning of a superhet before, despite many attempts to understand it!
Probably the best representation of a superheterodyne out there. Thank you for the video and the show notes. I keep a hard copy of your notes in a folder because they are such a great reference for me.
You are such an amazing teacher. I wish I had you as my professor during my college. The visualization really helpful for learning RF and electronics.
Super-helpful! The more of your videos I watch, the better I actually understand the dry, few paragraphs in my amateur licence textbooks. This one is particularly good. I am building a simple DCR right now but hope to work my way up to building a Super-Het.
Super important topic, thank you for covering it!
Thanks Alan. You landed this video right on my birthday -- Awesome present! Headed to the bench with an old AM radio to replicate your super-het demo. Too cool.
Incredible video and fine explanation 👍
These videos teach me so much I almost want to make an offline database of them haha
Alan: As usual , you have provided the most lucid description & explanation of a superhet I have seen anywhere. Bravo !
That was a great visual representation making the somewhat complex more understandable...Thanks 73
I love your videos on specific electronics basics and advanced topics. When I see that notepad come out I know I'm about to learn something! Thank you!
Good to see you making more videos. Thanks!
Your videos are one of the best ways to learn rf electronics. I love them. Thank you for posting them here for us.
That was excellent Alan. So interesting to see the spectrum analysis of the rf in, LO and 455khz signals and it's explanation. Thanks for sharing.
As always, a great pleasure attending to your lessons!
Great video, just makes sense!
You really do a great job of explaining things in a clear and concise manner!
Thank you for the complete explanation.
Excellent video as always. I know the theory, but, it's always a pleasure to see it explained in such a clear, concise and graphical way by a very knowledgeable coach
Well done. Thank you for having the graphs ready ahead of time and showing the process in action on your receiver. I am studying for my HAM licence and seeking explanation for some concepts from videos such as your video. Thanks too for your insight on the oscillator (being the tuner) and moving the frequencies to the ones of interest. Once again, Well Done!!
Man I would like to have you as a teacher :D thanks for the videos.
Love these basics on radio
Nice old receiver and excellent explanation!
Hey Alan, just wanted to let you know we use your videos as additional material in my undergrad RF class in university. Keep up the great work :)
That is really great to hear! I hope the videos help a lot of students! What university is this? Do all the EE profs use my videos (they're more than welcome to!).
@@w2aew Virginia Tech. There’s really only one strictly RF professor at the moment, but I believe another is on the way soon.
@@macuser1232 Oh, very nice! Believe it or not, I applied to VT in 1981, but didn't get in. I was #10 in my HS class. My Guidance Counselor was as surprised as I was, and told me that VT didn't take any out-of-state students that year. I was upset, VT was my first choice. Wound up getting my degree at NJIT instead. So ironic that my videos are now helping students there - awesome!
@@w2aew well, it took me two tries as an in-state student! Did a year at NCSU engineering before I transferred. Also a VT alum who is also a fellow ham is doing great things at NJIT currently.
@@macuser1232 Yes, and I'm sure you're talking about Dr. Frissell.
I am working on my Armature Extra, so your video was informative. Thank you.
I am still not comfortable calculating image responses, but I am going to keep working on them.
I always learn pretty much stuff from your videos!
Thank youuuuuuuu!
Well done. Great to see your videos popping up on the recommended list again. 73 de KI1Y
Brilliant work as always, always something new to learn, mixers are very interesting to understand and make, and to watch the final frequency arrive, the only problem these days are buying good quality components. Enjoy your videos very well done. Thanks for sharing.
Thank you so much, your videos are done with passion, it makes learning exciting and easy to understand. Regards from Hannover Germany.
Best example of super-het on youtube !!
Nice DX160, think I bought mine maybe 35 year ago, I have the matching SP150. Still a nice little radio.
This was very helpful! Thank you :)
Ha! Was working on a Zenith when this notification popped up! Enjoy all the videos...but extra excited about this one.
I always suggest to young people to look stuff made in the 70s because at that time a lot of consumer electronics came with a thematic and it was possible to learn a lot about electronic by looking at the semantics. I was amazed one time to see that the call button on a walkie-talkie was using voluntary feed back of the audio amplifier to generate the call tone !
spell checker fail Shematics
Wow, I love your videos already, but that was brilliant. Like others have said, I wish I'd seen this video when I first started learning about RF. Thanks again for the quality content!
Wonderful with spectral analyzer! When I was young, I have built several transistor radio set, it was difficult without osciliscope!
Holy cow that was helpful. Thank you.
Merci! Very important video for me.
Awesome video! It just occurred to me that listening to the radio would be much more fun if receivers came with built in scopes to show what you've shown in the video. It could also help tuning.
Many amateur radio (ham) transceivers do have multi-finction scopes that help with finding signals to listen to as well as other functions
With and SDR you can see the spectrum of the signal you are listening to.
Check out the RTL-SDR, they are about about the size of a flash drive and plug into a computer or tablet. You can get them for around $20.
@@rocketman221projects but that's the audio spectrum/waterfall display.
It doesn't show anything about like the principles of superheterodyning what Alan showed with the spectrum analysis.
De VU2RZA
@@subramanianr7206 An SDR shows the RF spectrum. An RTL-SDR shows over 2MHz. High end SDRs can show hundreds of MHz.
I have that very same radio that I bought with my tobacco money in the early 70's (I started with the DX-150 and the next year added money to it and traded up for the DX-160 that had a FET front end that the 150 didn't have) Tootles... Wade