Analog TV Equipment: R&S SFM test transmitter and CCVS video generator.
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- Опубліковано 1 чер 2024
- This video is a bit different from my previous videos and not related to optics. I made it purely out of interest for older (analog) equipment and technology. The video discusses the principles behind analog TV transmission technology, such as color encoding in composite video signals and RF transmission and modulation methods. For my demo I used a small TV set found in the street, a Rohde and Schwarz SFM test transmitter + CCVS video generator, and a Signalhound USB spectral analyzer.
Outline:
0:00 Wacko Christmas Intro
2:10 Equipment intro: CCVS generator + TV Test Transmitter
4:20 CRT screen viewed in slow motion
6:13 Monochrome composit video signal
8:26 Color composite video signal
12:36 Example of signal discussed
14:00 RGB-color conversion matrix
15:10 Rohde & Schwarz SFM TV Test Transmitter
17:29 Closer look at the transmission signal
21:15 The intermediate frequency explained
24:30 Extro
The following short clips were included in this video (under the fair use policy).
Please check out the full videos to support creators, using the links below
Sister Sledge - He's the Greatest Dancer (1979)
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Little Match Girl (2018)
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First analog color TV (Archives New Zealand)
www.flickr.com/photos/archive...
Original 1956 RCA Film: Vintage Television Electronics & Vacuum Tube Production,, TV technology
• Original 1956 RCA Film...
Did I forget a reference? Please let me know and I will set it straight.
Joshua Reich gives a nice detailed hands-on demonstration of composite video in this video: • Composite vs. Componen...
@Technology Connection UA-cam channel has made several excellent videos about analog TV technology. It discusses the subject more detailed and also from a different perspective (USA).
• Television
Gavin of the Slomo Guys shows some REAL high-speed footage of a color TV screen
How a TV Works in Slow Motion - The Slow Mo Guys
• How a TV Works in Slow...
If you want to know more about the entry level Signalhound SA44B spectrum analyzer I used:
signalhound.com/products/usb-...
Wikipedia contains pages on almost every specific subject discussed in this video. If you need more info then just search for the subject in Wikipedia. However, unfortunately most of the articles dive deep into the matter, which can be quite frustrating if you are not an expert.
----- - Наука та технологія
my physics teacher was an RF engineer in television industry and he used to explain us stuff about it outside of our physics lessons.
one thing that I remember him explaining is that somehow the frequency domain of different TV channels were not 1d frequency ranges, but instead somehow 2d rectangular areas because they used 2 orthogonal modulation methods at the same time. for god's sake i can't remember the details because it was way over my head.
there was also very interesting maths about how signal frequency range splits when you apply FM and AM modulation at the same time, then you cut off a mirrored part of the spectrum, then your signal becomes complex, then you do some magic to recover it during demodulation. it's actually crazy, the pervious generation of engineers was amazing.
At the time I was a student at the MTS in Alkmaar studying electronics I sometimes came across old televisions placed on the street to be picked up by the garbage truck when cycling home to Heerhugowaard. I then opened up the back of the television and took out the large A2 size schematics which was included inside of the tv. I then spend hours figuring out how that TV worked. If I now open up a new tv, unfortunately no schematics inside. Just a few boring chips.
I always found it very clever how they came up with the transition from black and white to the color in the signal in PAL. We also used to say NTSC stands for, Never The Same Colour.
Nostalgia!
You have a wealth of the kind of curiosity and clarity that is in seemingly short supply these days, even among science content creators. I am looking forward to the day when this channel becomes a household name among enthusiasts. Hats off to you.
“TV is a radio with benefits” - I’m taking this with me!
I think this is the best way you can spend 25 minutes on YT on a subject! Very informative, well presented! I wish I could give 10 thumbs up to it!
Only 10 k views? How this is gold. You and cathode Ray dude are my fave.
It blows my mind this was done with without software or microcontrollers/cpus and just analog parts is amazing.
I spent a good part of my electrical engineering career working on demodulators for analog TV. It's, by far, the most difficult signal I've ever worked with, the spurious-free SNR requirements alone were >70dB on a 40" HDTV, and that doesn't get to the hard stuff. I became the guy they would send to that 2hr meeting at LG in S. Korea, because there was no alternative to seeing the video impairments first hand.
They way you are able to explain things is phenomenal. Great instructions, calm explanations, thorough and in-depth, great examples, great drawings. Absolutely fantastic! very much in love with your channel. Dank u wel meneer Huygens ! :)
This was so incredibly clear and well delivered! Also the intro was hilarious! xD
I loved that intro. Your family is adorable -- especially the new addition. The whole video was great.
I had a very similar tv but with a built in VCR (another crazy piece of related tech). When I was quite young I found a signal generator that I put through my composite video and many interesting patterns appeared. This sort of reminds me of that except you know what you're doing.😅
Thanks for this video. Brings me back to the school times and learning how to repair a TVs at school shop. Thanks.
I never knew about the transmission part of the whole analog TV process, super interesting! It's interesting how ycbcr is still very much alive in modern image and video applications. I had always assumed ycbcr was somehow natively understood by the way they built color CRTs but it never clicked for me that those devices too need to translate to RGB. Not much has changed in that regard these days. Fijne kerst!
There are several concepts in this video that I had wanted to understand for years. Very clearly explained!
Not much long ago I rescued a similar sized (but much more modern) set in the same situation. It's like rescuing stray puppies. I'm an EE now, and my fascination came about by trying to understand how it all worked, and the answers just taking me deeper. (consider I'm on the younger end of millennial)
I bought such stuff for around 70000 deutschmarks in the beginning of the nineties last century. It was for a video conferencing equipment development.
Fantastic explanation! Finally I understood something I just wondered since I was a teenager trying to know how things work. I read about some crazy hard math stuff and let it go but it is relatively so simple! Thanks a lot. Really.
I have seen quite a few videos on the subject but none this clear and complete (especially the RF part was new to me). well done!
Even though I already had a good understanding of this technology, I just couldn't stop.
Fantastic video. Never considered the non uniform down mixing of rgb signal to black and white. Wonderfully explained. Thank you
Subscribed and selected to be notified. I found your channel looking into optical flats and was very interested in the bubble level you built for your dad... good stuff. Now I'm blown away, what great content!!! Anyone who is curious on the kind of level you are and willing to take the time and effort to share it deserves high praise. Good job sir, a very good job indeed.
Really interesting, thank you so much for making this fantastic video
This is an astonishing explanation of analog TV!
All this led me to re-read everything about NTSC/PAL/SECAM !
6:00 - The slow motion hack is genius 👏
Very nicely explained and just a pleasure to watch! Thank you for all these great videos over the past months and years!
What an amazing explanation, I learned a lot! You're a really good teacher!!
Lol at 5:18. 'Dad stop talking about CRT monitors I'm trying to film a tiktok'
Just found your channel. Love this stuff and you are great at portraying the info. I'll be binging your back catalog!
Fantastic video! While I am subscribed for your fantastic optics content, I really liked this one also. As other have said, your explanation skills are amazing.
So refreshing 😌
i honestly think that back in the days of analog circuitry being an engineer might have been the hardest time to be an engineer.
sure, modern high density digital electronics are way more complex, but it's always possible to break them down to trivial enough components. but back then it was simply not the case: analog circuitry is like a hairball that you can't simplify past a certain point.
Great video. The way you explain things is phenomenal.
What a great video, very well explained
So you could attach the Pb and Pr signals of a video stream to an X/Y oscilliscope to get a visualization of what areas of the color space are being used.
19:38 I think this explanation is somewhat imprecise.
TV uses vestigial sideband modulation (AM with lower sideband mostly filtered out). What you describe fits more FM modulation.
Plus, on a conceptual level there's nothing that forbids multiple sinewaves to coexist, as per superposition principle. The signal on oscilloscope looks just like a jumping sinewave because it's narrowband compared to the carrier frequency. It would have different instantaneous shape only if there were any harmonics, which don't occur in well-behaved radio transmissions.
Wow, great material! Thanks!
thank you for this!
Best Christmas Ever!
Excellent video!
Great video
I wonder if by using this absolutely fantastic signal generation tools and maybe PC for control you can make some kind of randomly generated demo-like video on analog TV. As I saw the RS generator runs on MS-DOS, which makes it easier to tinker with its software.
I'm very confused about why the transmitter displays an intermediate frequency. As you explained, IF is an implementation detail of the receiver, and the math of applying modulation onto an IF doesn't require the signal to know anything about the IF, so I don't know what the transmitter could possibly have to do with it. It's like if the transmitter had a display for "screen-to-viewer distance" - it could be different for each receiver, and wouldn't affect the signal anyway.
The luminance signal is AM modulated buy you explain it as though it was FM modulated.
perhaps with the quick application of some black magic marker, you could change the logo so its name could be 'Phillip'
I guess the image generator can also keep a track of your corridor remote sentry guns remaining ammo.
Those tv generators and transmitters are a set of phd's on their own.. Coping with all international standards
This is real electronics no plug and play gear here .
Hello, are there any interesting applications for the electron guns? I bet you know them all
make a free-electron laser ;-)
Do you have a SOURCE for that particular Older Equipment? Putting Together a Makers Group or Young Future Engineers!
I bought it of www.marktplaats.nl, but given that you are probably in Wisconsin, this info will likely not be of much use to you.
@@HuygensOptics I could not figure out the spelling...great stuff...replace the tubes with FETs on paper or in mind to be able to look at the old tube schematics.
At least to understand the paths and control mechanisms.
Also will pick up a signalhound, been wanting to get a good enough SA for home.
Magenta is pronounced majenta, English is weird