Software Defined Radio - An Introduction

[@gwagner3446]

Jeez! This kid was born to give engineering talks! Such great stage presence, clear speech and adequate pace. Keep it up man! Very interesting talk!

[@mikelee1906]

I watched about 30-35 videos on this subject. Then I watched this video and learned about 50 times more than all the others combined. I had to keep stopping and google a dozen times while watching. Thought I knew a lot on SDR. I was wrong. Well done!!!

[@ernieferguson6346]

me too, been lookin for resources & this 6yr ago video has more info than almst any other... wonder what this kid's up too now..

[@Willam_J]

Schuyler - Great job! I started out in electronics when I was 9 years old. I developed a passion for it, got my EE degree and have enjoyed a long, rewarding career in electronics. Stay the course, keep your passion for electronics and you'll do very well in life. The best engineers and technicians I have ever worked with started out, early in life, developing their electronics skills. (As opposed to the people who graduated high school, had no direction in life, decided electronics was the way to go and struggled through their career because of their lack of a genuine interest in what they were doing.) I hope you get the chance to present at a DefCon some day. You're going to knock their socks off. This presentation is better than 70% of the DefCon presentations I have attended. Don't let any of the negative comments discourage you. Some of the comments sounded like criticism, but were actually well-meant and were from people genuinely trying to help you. You did a great job. This video is three years old and I'm sure that you've learned a lot more since then. Keep your passion going. We are struggling to find engineers with your kind of passion. Take care!

[@bimmerboard]

You're amazing, Schuyler! Well done. I can only imagine what you're going to achieve in your life, if you're already doing this kind of in-depth work. And you're public speaking skills are fantastic as well. Keep up the good work!

[@DavidDavida]

i Second DavidsComments here . and To David Cecil Thanks for sharing aPerfectCompilment ThatPerfectlyFits...

[@cmntkxp]

a kid infected with some 40 year old rf engineer's spirit

[@ConsertandoTudo]

I used to believe I was smarter than average. This kid is running my self esteem.

[@Boediprasetya]

A kid member amateur radio

[@freem4nn129]

this kid is gonna go places. What he said was l33t enough to endure the interferance glitchy sound. nice job mr schuyler

[@AnacardiumOcidentale]

This little guy is amazing! Congratulations!

[@FandangleProductions]

Reminds me explaining to my dad how electro magnetism creates motion in an electric motor. I was 12 years old. My dad just sat their dumb founded. This dude rocks and talks my language. He knows what he's talking about.

[@thunderbolt997]

this is the intelligence that one can learn by not spending time watching vine compilations and play games all day

[@goodyra]

Hi Schuyler. I´m an amateur radio operator in Spain. My callsign is EC4TX. Fantastic introduction to SDR Schuyler.

[@aircooledcamper]

Great job, Schuyler! If you want to understand how a mixer works, I recommend downloading some technical books or papers on analog radio from the 1960s or earlier. Back then they explained things in common terms first, and then quantified it with the mathematics. Nowadays, they just give the mathematical formulas with scarcely a word between them because they don't really want anyone to understand technical information. It may also be possible to find information on an english language non-American website. Sad to say, that has been consistently my experience for at least ten years now.

[@Vlerden]

I teach our soldiers music theory as it relates to amplifiers... sure, solid state is better, but the concept is the same.... Those uber smart kids I will tesese them into this field... so far I;ve gotten about 2 out of the thousands...

[@7xr1e20ln8]

Dude, this kid knows his shit. Learn kid. You are going places. All the very best.

[@rallokkcaz]

It's crazy how when he leans towards the SDR hardware you hear it interfere with the wireless mic signal. It's especially cool when he uses the live/real-time analyzers.

[@fecheverria]

Thanks for this great explanation. Keep posting stuff, your presentation style is good.

[@ruggedrick]

Smart kid! If I listened to it, I'd think someone with more years was presenting. Lots of great info.

[@curtchase3730]

The poor kid needed a laser pointer or a stick to point to the images on the screen. I can't imagine how much this young man has progressed since this video was produced! He reminds me of those kids who can play Mozart on the piano at age 3.

[@_TeXoN_]

I still can't figure out how he can say, that he does not understand the difference between SSB and CW at 25:40 and hold a amateur radio licence. Is the amateur radio licence in the US that shallow, that is does not even cover that? In Germany you have to understand receiver circuits for each band an much more for the common modes.

[@stryker607]

Great work kid! I was looking for the structural difference between JTRS(Link-16's SDR terminal) and conventional LVT terminal series and found this vid. It was very informative

[@JorgeAnais]

Awesome presentation! You save me a lot of time searching on the internet. Thanks!

[@rendydddd]

17:01 how did you get that pic?

[@coriscotupi]

Very cool. One correction though, in a standard, old-school hardware radio, the mixer does *not* multiply frequencies and the "math" going on inside the mixer is actually quite straightforward: as signals from the amplifier and local oscillator are mixed, they are added to each other and also subtracted from each other (i.e, both the sum and difference are produced). The sum is usually discarded and the subtraction is used. Thus, the local oscillator is usually tuned to a frequency lower (by the amount of the IF frequency) than the desired tuned frequency. For instance, a broadcast FM receiver tuned to 102.7 may have its local oscillator tuned to 92 MHz and feed the resulting frequency to the fixed-frequency, 10.7 MHz IF (102.7-92=10.7).

[@Migsterification]

Hi corisco. You are right that the mixer doesn't multiply frequencies, but actually a mixer does multiply signals in the time domain. The effect this has in the frequency domain is the sum and difference you mentioned above. Mathematically, a mixer is explained using the trigonometric equation: cos A * cos β = ½[cos (A + β) + cos (A − β)]

[@coriscotupi]

Migsterification Yes - but that applies to wave form and phase, not really important if all you are interested in is the actual input and output frequencies which was the object of my comment.

[@InsideOfMyOwnMind]

Haha give the kid a break. He comes from an era where they call a record "a vinyl."

[@crobulari2328]

All true. The boy is good though. !.

[@MrCuddlyable3]

@corisco tupi Instead of dismissing Migsterification's post as "not important" you should read it carefully and realize that when input frequencies to a mixer are Fa and Fb, their instantaneous values are cos(2 pi Fa t) and cos(2 pi Fb t). Migsterification's trig equation demonstrates sum and difference frequency outputs when you put A=(2 pi Fa t) and β=(2 pi Fb t).

[@SDRplayRSP]

Re the spectrum analysis question, we've heard reports of the SDRplay RSP working well with DL4YHF's Audio Spectrum Analyzer ("Spectrum Lab"). "I took the SDRplay HDSDR ExtIO DLL file and loaded it into Spectrum Lab, and it works :-) - needs more investigating, but it sure works.... " The Spectrum Analyzer software can be downloaded from www.qsl.net/dl4yhf/spectra1.html and SDRplay info is on www.sdrplay.com

[@supersat]

Those sidebands are for HD Radio, not RDS...

[@gururprasad2278]

Very Impressive! Keep up the good work!

[@ahuachapan2]

This young man is smarter than my current university teacher.

[@InsideOfMyOwnMind]

I did have the re-creation of the 5 tube superhet that I built in high school on my bucket list but this is beyond cool. I just may have found my new "Legos."

[@alexyap7323]

Genius. Bright future ahead of you.

[@wizardslies]

I wonder how this kid knows that much... :O I guess it wasn't public school. Any guesses?

[@Wuety06]

Ozxmin O'malley I doubt he spent a day in one .. the amount of homework teaching him to ultimately write papers that explain how he feels about a topic ...would have taken all his time. Pretty smart tween, needs to work on presentation skills a little but really his only fault is not pausing long enough and actually incorporating results of his questions...that takes time to learn though

[@vazduhvatra7949]

SDR radio not can work on VISTA...somebody know why?

[@numb3r663]

vista sucks.....did you install as admin?

[@vazduhvatra7949]

I think not...i just run as admin...

[@InsideOfMyOwnMind]

It's because radio hadn't been invented yet when Vista came out.

[@vazduhvatra7949]

Thanks ,i didnt know that.

[@vazduhvatra7949]

In android tablet can work?

[@ilyasemichastnov]

Very nice presentation, thanks!

[@walterhynson2898]

the best vid ,the best teacher

[@annablendermann]

Brilliant kid, very interesting!

[@dadominicanstyl]

Great presentation!

[@moaazsherif5236]

can i use SDR to implement OPTICAL OFDM ( DCO-OFDM ) ?

[@georgiosvergakis5666]

FPGAs are used in satelites, changing the software there, remotely from earth, is equivalent to traveling to space and changing the PCB board in an old fashioned satelite. Only a lot cheaper.

[@ZatoichiRCS]

It’s called Convolution. In the time domain multiplication is convolution in the Frequency domain. I’m sure he’s so far ahead than most people if he can “do the math.” I bet he did!

[@xoox870]

GQRX = GNU Radio with the Qt graphical toolkit - Receiver (RX) ; ADS-B = Automatic Dependent Surveillance - Broadcast ; RDS = Radio Data System

[@jamalwilson6181]

Very nice presentation.

[@thomasrondeau3175]

Well done!

[@RatedRudy]

I feel bad for myself. Our education system killed every bit of motivation since early age. 20 years ago, I had to study for my general education, and had minimal resources as this kid had, at half my age.

[@sciencefordreamers2115]

Great man!

[@jaSi9]

Really enjoyed this. Very informative. Thank you. 🤎

[@VikramReddyAnapana]

Wonderful.

[@elianalopez5978]

somebody has this vídeo with subtitles in spanish ???

[@freem4nn129]

ow its his channel ... good job kid !

[@Escursionifriuli]

Veri nice, fantastic!

[@abhiapsunde]

Take a bow Prof !

[@brendantownsend216]

Great lad. Well done

[@watchfan6180]

is he a radio ham?

[@fazhiwang6464]

fantastic！

[@nileshbarshepatil]

Cool very well explain according to age

[@emmanuelcachia5389]

the best teacher Smart

[@murrij]

Well done.

[@amederle]

good job =D .. that guys awesome

[@dennisveatch8155]

Regarding the concept of mixing. For example, you have two frequencies of 100hz and 150hz. You will end up with your two starting frequencies AND their sums and differences, in the case those are 250hz and 50hz. There is no math (persee) going on here. That's just the natural results of mixing in the analog world.

[@borriskarlov8140]

It's an infinite series. Plenty of math going on.

[@qqlove139]

The boy is so young!

[@jpmorgan187]

Boys do tend to be young

[@researchinstitute2675]

Brilliant.

[@greatsea]

at 5:07 he meant 17 hundred

[@RobertoPietrafesa]

Thank you for your video, gentleboy! How old are you? May you come here in Italy to teach to our stupid "all-smatphoned" boys? Thank you very much indeed!

[@barunbasnet]

Thanks Prof

[@nathanjames4242]

Of course the presentation on nerdy radio stuff the audio is full of static.

[@AliBaba-vw7mo]

This guy is a bloody prodigy

[@Vlerden]

not really. He just reads the wiki's we live in... nothing he has said was new or cleaver

[@brothercavil491]

I'm gonna go out on a limb and guess that you weren't talking about hardware and software radio block diagrams, the nuances of FPGAs, and spurious interference caused by ground loops before you hit puberty. This kid is clearly bright. You are clearly a troll.

[@Vlerden]

Yeah, I was in a tolling mood when I wrote this (I was kitty scripting my stuff at the time). He is much smarter in the subject than I will probably ever be. Especially when he creates a well presented and simple explanation of the subject matter.

[@deadeye1982a]

Wow, respect. This guy is very precise. I guess the audience does not understand what he is talking about :-D

[@greenmtn3484]

Wow awesome! Wish i was as knowledgeable at that age!

[@joudiharb]

At min 39, the spectrum analyser does not use FFT!! Picoscope for example uses FFT to go from time to frequency domain. The spectrum analyser just dont :D

[@xoox870]

so many errors on this video, but I give the kid credit for really trying to do a good job. - also he is a very good speaker !please review every detail of your presentation as there are many errors. - funny part at the end is that the kid is teaching adults !! :-b - - much better than the vast majority of Indian professors which you can understand a damn thing ! ;-b

[@aliciagudalupetoledanosala2409]

It`s so little

[@noahcarl953]

reminds me of the kid from the show Stranger Things

[@sluge1]

good boy)

[@edwardreichert7519]

Interesting, a lot of this info used to be classified secret by the military..., lol times change

[@topnatche5622]

Alot of physics. Helen.

[@djalmap9945]

I should maké comments about rtl sdr .....but its almosŕ impossibilite.?.. I fell a mix of jelous and proud of you.... my sincéres congratulations......i know you receive thousands of comments like mine....probábly you have some kind of bulling from others kids....but i assure you in the future the things will be become better....when you grow up nevér trust 100% in your colegues ..... I am sure you are going to learn it quickly....all the best for you.....sorry for this f*** text coŕrector.....

[@Captain_Rhodes]

woah to advanced for me

[@Wuety06]

The correct answer to the guy with the paranoid...can I scan my property with in 500 yards ... yes you could make it scan it's entire range in a loop but if u want to save 400, bucks...your brain can do it better if u make a tinfoil hat

[@krupaneshkrishnan9284]

Smart Kid...

[@Dreadwinner]

❤️💟💝💖💗

[@SenzoDlomo]

Came here from GitHub...

[@redsquirrelftw]

Wow this kid is smart. At his age I was still shoving metallic objects in sockets to see what happens.

[@Vlerden]

no he isn't... He is of the internet generation that learned how to speak old people......

[@xxxXXXCH04XXXxxx]

@@Vlerden Or maybe, MAYBE, kid has autism?

[@boboften9952]

Your Going To Need A Bigger Boat .

[@adrianmelton9225]

Lmao

[@___xyz___]

Adrian Melton aids

[@iamhe999]

Very young..... a true enthusiast, needs to plan his presentations better, and stop using words like "stuff" and "things" so much,,,,,, also don't try to teach everything you know in one session........ try to talk slower, Finish every sentance you start..... learn the art of teaching, and the art of explaining...... hope this helps..... keep up the good work.

[@rne1223]

This kid is smart, but so condescending. Good job tho.

[@KandiKlover]

Meh anyone can do rote learning, he won't be so co descending in high school when he still has a tiny pecker and forgets all this after his first time trying booze at a party.

[@harshitnic]

Thanks for this great explanation. Keep posting stuff, your presentation style is good.