Any time you can weave Benny Hill and his beauties into a video, you've got my thumbs-up. Nice radios, too, BTW.

Interesting, but the limitation with digital is there always a need to use error correction, when you have noise and path issues you can only go so far by doing this. That is why I am working on a new hybrid TV transmission system that is both analog and digital, somewhere between to transmit a signal without the requirement for error correction, where noise reduction is used. By doing this you always get a picture no matter what, it also has very high level of spectrum efficiency, as 100% bandwidth used to send information, making it go over very long distances. This has a lot in common with narrow band television systems that were used in the 1920 to the 1930's, it can also be used via sky-wave propagation at something like VHS quality. As this is a very new approach to modulating TV it has keep me busy two a bit years working on it, as I have just got the modulator working last weekend. Therefore technology is always been worked on and what was once was seen as impossible can now be done, making for a new ways to sent TV pictures.

I used to be concerned about this, but now all of our communication and entertainment (except my radio station) come over optical systems. Great show! 73's🎙KD9OAM🎧

Very well done! You did a great job of making a concise, waveform based presentation.

There is no backwards compatibility between NTSC and ATSC I always preferred CODFM to ATSC. Ron W4BIN

Mike since you tackled DTV, maybe suggest looking into the IBOC digital radio that was tried on AM and is currently on many FM stations. Did you know the IBOC system takes up more bandwidth, into the adjacent channels on both sides, than what the AM or FM analog bandwidth uses. Why is the FCC not concerned about this interference?

Thank you very much Mike, for the very technical informative video on the various DTV waveform formats and the pros and cons of each method of broadcasting DTV signals. We could use some common sense when choosing a system.

Ofdm the magic of 5g, 4g and wifi, not the best for long distance modes😢😮

Please show ifft function in detail 😂😂😂

About 23 million households access TV over the air in the US. It's larger in the EU at around 250 million households receiving digital over the air TV.

The way I explain OFDM is like this: Imagine being in a large cathedral with lots of echo and reverb. If the organist would start sending out a message in morse code, the dots and dashes will blend into each other. If instead he plays chords, but more slowly, you can carry the same amount of information, but the chords blending together is less of a problem as they are longer. It's also something that's been done in Germany since about 1991 for DAB (Digital Audio Broadcasting). The main problem with terrestrial distribution in Germany is actually that there is to little spectrum around. Single Frequency Networks kinda eased that, but with LTE taking much of the "digital dividend" you still end up with your typical 3 muxes. Granted H.265 gives very decent pictures even at rather meager bitrates so you can still have 17 or so channels, but only few people rely on DVB-T2 to get their TV. Around half of Germany gets it's TV via satellite, while the other half is on cable.

Another great video with excellent demonstration on the facts of our new "digital life's". There is no need to analyse further more the technical aspects to understand what is happening with the global broadcasting industry and the political "lobbies"! Regardless of all of this, I'm more than happy who someone have "The Testical" to enlighten the people who watched the video, without drow them to stupid political argument for who's, how's and why? Well done Mike! I'm really glad for the algorithm's who makes me "stumble" in your channel! 73s de SV2ODL

“57 Channels (and nothing on” - Bruce Springsteen I currently can view 40 channels OTA. Frankly, there is nothing worth watching. I could care less about ATSC 3.0 short of having a signal less susceptible to multipath resulting in pixelization/frozen picture/sound drop out. But I digress. Broadcasters already utilizing 3.0 are encoding their signals… unless you ‘subscribe’ you can’t view. That is a show stopper for me. I do appreciate your technical information… thank you.

Wow you have a vast technical background! Thanks for sharing this with us. Way above my technical knowledge, but I still feel smarter having had watched this. I would love to see you do a video series on aviation communication some time. Still waiting on the peanut gallery's take on this video, but that's for later I guess. You run a great channel. Take care and 73

we? Harmful interference are contests and traffic nets.

Why bother to broadcast ? Put it on the internet, avalable on cellular, copper and fibre .

...no more pilot. Oh well. Thanks Mike! 73 de W3IHM

Very complicated but I'm glad I watched. Thanks for your time and effort in putting this together in a digestible format.

I impressed with this Radio,I love Radio Circuits and listening.

I remember 16 stations I could pick up with my giant antenna on the roof that did low, VHF and UHF bands and had the rotator motor and an amplifier at the set. They ran cable TV in 1970 and by 1980 they had 40 channels, but the ones above 35 were fuzzy. Analog TV over the air was okay, but in 1983 I Hooked up a C-band dish and Uniden receiver and the first images I got as I was aligning the dish, it was like seeing HD before HD existed The image was so clear and so sharp and stereo sound It blew my mind I moved because I have gotten sick and bedridden and I had to take down and give away my satellite dishes in 2016😢😢😢😢 I had almost 7000 stations I could receive on C & Ku band each day And about 3000 radio stations I really miss my dishes

Nice tv history and technical details 😊😊

No more shorts?

I have seen zero help from ATSC 3.0 multipath handling against windmills.

nice history of TV. In the early days of analog TV. we has CH 1 to 13. I used to have a old TV that way. Had to use a UHF converter for UHF. was 14 to 83 if I remember. Ch 1 was dropped. gave low band VHF for fire/police and 6 meter ham band stuck in their as well. I remember some local channels switching to lower UHF channels as cell phones coming out. Many never knew why TV started at Ch 2. Some CATV systems had Ch 1 . And I remember that rule of ch 3 or 4 . 1 had to be open. some neat TV history

I used to work with a DVB-T conformance testing consultancy a good few years ago - it will be very interesting to find out more about ATSC 3.0 as I've been out of that market for a long time.

The old standard serviced us well for years. Today HD 1920 x 1080 on large flat screen is all I need and perhaps will ever need.

Great!

Great trip down analog TV memory lane. I had forgotten the Fahrenheit 451 interactive TV reference, quite prescient. That is what makes Sci-Fi so interesting. It is fascinating rereading old Sci-Fi stories to see how accurately they predicted the future. As a babyboomer the NTSC analog compatible color design was a fantastic technical achievement. Although in the early vacuum tube days (valves on the other side of the pond) the NTSC moniker was referred to as "Never Twice the Same Color"

This is an excellent review. The only thing I think you omitted was that the sound on NTSC is on an FM subcarrier.

Back in the late 1960's & 1970's, I did TV B&W and Color TV repair work. I knew enough on how to troubleshoot and fix all TV sets, but did not have a full grasp that the Color signals were sent as AM Phase modulation until decades afterwards.

We live in a fringe area and have always used OTA for TV even though we now have access to high speed internet. Initially I was very excited by the prospect of ATSC 3.0 compared to 1.0 for the reasons you stated. However seeing stations rushing to encrypt their programs I've pretty much lost my enthusiasm for ATSC 3.0.

Very well done Mike! I really don't know anything about tv, except for watching Shango066 blow up some. You have a wealth on knowledge on all things electronic and that's no easy task as I've been a ham since 1993 and into electronics since being a little kid, and continue to find myself stumped with harder technical issues (and others). My dad worked for Dataproducts New England in Wallingford, CT. Coincidentally they also had a facility in Manchester, NH. As an 10 year old child, I was fascinated by all of the latest technology of the early 1980's, especially the line printers that towered over my head when I was allowed to visit his job during an open house. He was in personnel management and not a tech person, but would bring home huge boxes of junk parts for me to play with! I see, based on your QRZ page, that you have aviation experience. I would like to see any videos on that subject, especially on how the RCAG sites work and how ARTCC's transmit and receive aircraft and radar info. It seems that all things aviaition related are classified, privileged and arcane information. In 30+ years in radio, I've never met anyone who knows anything about it. Just an idea for some future video. Thanks for putting the time and research to bring this all to us! I appreciate all you do. Even if you can't copy FT8 in your head.(like Burt can). 73! -W1RMD

Best presentation of analog television history EVER!...wonder with the advent of color tv broadcasts whether new forms of interference appeared on the test patterns of post-war black & white televisions as chrominance may have accidently infringed on luminance!!…doubt that things could have been so precise as to not have any problems!!!

Thanks to using QUAM for the color subcarrier, NTSC is often called "Never Twice Same Color." PAL flipped the phase 180 degrees on every other line to try to remedy this.

Wow, Mike you have packed a lot of interesting history of Early TV. I really appreciate this video that much, I will have to watch it a few times to review all the details.

@23:47 Just that picture answers most of my questions.

My grandfather got to watch TV in the mid to late 30s in Petersburg Virginia. He had a friend from school (or maybe the neighborhood?) around his age whose dad was a ham and had homebrew built a TV set to receive the experimental TV work that was being done in Washington DC at the time. I often wonder how the friend's father had managed to acquire a suitable picture tube. It must have been magical to experience going over to a friend's house to see such a thing at the time.

Thanks Mike for bringing back some old memories. I worked for Granada TV Rentals in the UK for about 5 years. This was when Black/White televisions were just moving into colour. Many of the television rental companies faded by the wayside when people preferred to buy televisions than pay a monthly some. I enjoyed working with Granada TV Rentals and learnt a lot.

"Take that off the table?" There is nothing on the table.

59.95 Hz for colour. Nominal 60 Hz before that? Was it mains locked in the US as it was in the UK so that receiver hum bars were stationary?

Mike did you get into slow scan amateur TV? Your TV antenna experiments seem interesting too, good old VHF antenna handbook.

I can remember watching the TV late at night when the Station shut down for the evening, the national anthem would play then the "Indian Head" test pattern would appear. Awesome days! I remember not long before my Father retired from Lockheed Aircraft, Dad being an amateur xtra class,he was gather materials from Lockheed to build a ham radio television station, he had a truckload of microwave waveguides and other parts required to make this thing happen, unfortunately Dad fell victim to dementia and Alzheimer's and his project never left the drawing board. Rest in peace Dad!🙏✌️⚡🎙️

My last technical question to my father, back in 1968, was the following: "Dad, how does colour TV work?" His answer was, "I don't know." My previous such question to him had been "How does TV work?" and he accurately explained, even though he was no expert in electronics but in (a) architecture and (b) laws, given his two careers. With the above last question, I knew I had pushed too far and reached his technical knowledge limits. I was 13 years old, and he died the following year, a few months before the first human landing on the Moon. I have a clear memory of his many technical teachings to me: hydraulics and its applications to car braking and other systems when I was six. Aerodynamics and Bernouilli effect, when seven (carburetors, Pitot tube, airplane wings and control surfaces, propellers and helicopter rotors, sails). Archimedes law and flotation when 8. Thermodynamics when 9 (how a refrigerator works). Electricity when 9 and 10. Electronic vacuum tubes when 11. I remember a question to him when I was six: "Dad, what's a robot?" He pointed at the car's speed indicator and said, "This is a robot." Although I knew his answer didn't totally fit, I got the gist of the matter: a robot had to receive some input from its environment and had a mechanism to react to it. I became a commercial airplane pilot, but quitted after noticing I had dangerous distractions. Then I learned programming, computer design, database management, networking. I worked long on such for a living. Finally, I ended up understanding how brains manage to understand the world and react to it. Cognition is no longer a mystery to me since last year, when the last piece of understanding clicked in place and my Eureka! moment came. Without my father's mentoring, I doubt it would have.

Thank you Mr: Mike.

Thanks Mike - an excellent explanation of some incredibly clever technology and engineering.

🤣🤣🤣🤣

Interactive TV? Reminds me of Patrick McGoohan in The Prisoner (1967) I wonder who inspired whom?

I built a crystal radio with bias voltage and multiplier as a child according to the magazine "Radio Constructor" 1965/1 (published in Czechoslovakia republic original as "Radiový konstruktér") and it worked very well :)

I'm glad I found this again. After my previous comment 3 years ago I found that things may not be tuned up properly in the i.f. stages. It works but not as I expected. I was able to greatly increase the volume of the set be adding a variable capacitor which is around 100 pF from the grid of V1C to earth so it's been open for three years with this capacitor sitting on the metal screening. I'll try again after watching how you connected the sig. gen. with a capacitor and resistor. I didn't do this and simply tuned things by on air signals. I have a synthsised v.f.o. now which I can use as a signal source. I'm wondering if the capacitor in the i.f. can has silver mica disease and is doing nothing or shunting the signal to earth. However after hearing that c.w. signal at the end maybe my set is not working too bad. I since worked into Mallaig, some 280 miles distance on 5.262 MHz QRP frequency and a low inverted vee. Purposely 3 Watts c.w. on low H.T. I like that frequency as it's a wide rx so not as crowded. 73, G4GHB.

I'm encouraged by all of the excitement in the comments. Again I'm trying to go light on the potential uses or misuses of a powerful new technology, that is in fact being rolled out now in certain markets, and try to cover the features and history in a light manner. I am not a TV engineer! But I have been an engineer in the business at times, and have demoed new technology to TV Engineers (very opinioned, knowledgeable and particular folks by the way!) and have been to stations like TV Poland, BBC Cardiff, BBC London, RAI Rome and ABC and have presented to Sinclair, and have attended NAB, IBC and CES at times in my career.