@@peskyparttimers8239 A friend submitted the idea of using a microwave oven as a way to quickly destroy CDR's, used in military systems in the field, after seeing me do that as a drunk demo. Never got taken up as far as I know. Technology moved on to flash drives.
I have repaired both SO and SJ radars. When working properly they were pretty good. On the short range you can see individual pier pillings! Many were sold to San Diego based tuna boats. And we're in service till the mid 70's.
I have spares for a Marconi Radiolocator Mk IV Radar from a 1950s merchant navy ship, which includes the magnetron, Klystron and Trigatrons. Even have the servicing log book detailing all the repair work carried out during its service! There was even a huge spare magnetron magnet but as a child, I got it stuck quite firmly to my father’s Caterpillar earthmover. It didn’t come off in one piece….
0:55 I remember using an ex-military 'portable' radio set at school. Portable as in one person could just about carry it and its heavy batteries while someone behind them could tune it in and speak to the others on the exercise. It was theoretically also possible to listen to the VHF TV of the time or even the fighter aircraft on exercises but we'd never do that, honestly. And nobody would have even thought about pressing the transmit key when on those frequencies.
I used to have a cool coffee mug from the Computer Museum in Boston. It had a gold matrix/grid pattern all around it. I regularly filled it with water and heated the water in my microwave. One morning I wasn't quite awake and put the empty mug in and set the timer for 2 minutes. Sparks flew everywhere off the gold design! I didn't know whether to run over and turn it off or run out of the room.
It's great to hear you credit the English man that documented microwave cooking that was before the first magnetron was secretly carried to the USA when they closed a large part of a major city when they realised. I remember seeing him interviewed on uk tv many years ago he was Great.
And I thought it would be about spread spectrum frequency hopping. (Thanks Hedy Lamarr!) Hope there was no beryllium or other toxic shit inside. Always appreciating a lovely collection of Nixies, VFDs, EL displays - and other readouts.
"Most magnetrons contain a small amount of beryllium oxide, and thorium mixed with tungsten in their filament. Exceptions to this are higher power magnetrons that operate above approximately 10,000 volts where positive ion bombardment becomes damaging to thorium metal, hence pure tungsten (potassium doped) is used. While thorium is a radioactive metal, the risk of cancer is low as it never gets airborne in normal usage. Only if the filament is taken out of the magnetron, finely crushed, and inhaled can it pose a health hazard." Don't crush up the ceramic parts of a microwave magnetron, and assume there *might* be beryllium and thorium about, so wash your hands after handling them. The hazard is real, but relatively low.
I was working with old bendix RDR-1E, one time I was sure that something was rattling inside, after lots of time I found out it was a tool in the drawer at the bench moving after the magnet.
A common LC resonant circuit, though the inductors (round cavities) and capacitors (parallel walled gaps) are formed a bit different at these frequencies.
I have a Soviet version of those radar magnetrons, though the biggest one I’ve seen in person is a MC567 which was used in a large radar station from the late 60’s to the late 80’s. It’s big enough that it needs water cooling to function.
And by the way, the melting candy bar story first appeared in a 1950’s Readers Digest magazine, so it’s a pretty apocryphal story, the heating effects of magnetrons had been known before this, people used to keep their hands warm from the output.
A very interesting video! Love to see a real magnetron from inside! About baked beans: forget Heinz, find some baked beans called "prebranac", it's food of the gods! :)
I dunno I can still hear the distintive whine if a flyback and the horizontal or was it vertical? circuits of old tvs which were up there in the audio range
On of my earliest and formative internet experiences was stumbling upon an explanation on how to hack microwave ovens to work with the doors open to misdirect NATO bombings in ex-Yugoslavia. The site had loads of experiments with microwaves, like CDs, toothpicks, all very very dangerous. The UK has some amazing spy stories, I'd like the museum to dig into real but obsolete hacks and gadgets. There used to be an area of London that had shops that had these in the window, I remember being puzzled looking into them as a kid. Actual spy stuff. But you know, (not) obsolete. Can we have some of that on the channel?
4:50 If you want to see someone powering up a mercury rectifier similar to those thyratrons there’s a video on photonicinduction ch and Mr Carlson’s Lab powered up a vacuum tube(valve) of similar size recently.
What about using marshmallows, or strips of cheese to measure the wavelength of the microwaves, and then calculating the speed of light from the wavelength and the frequency of the microwaves
For the history of the development of radar during WWII, check out the history trilogy for the U.S. Signal Corps: The Emergency, The Test and The Outcome.
Great BBC documentary on this subject. From the late 70's, so many of the original invertors still alive to give interviews: ruclips.net/video/GJCF-Ufapu8/видео.html The radar episode starts 49mins in. Great technical description. I was just typing the anecdote about the S&W revolver cylinders being used as drill jigs, as you mentioned it. Tom Scott did a piece about Percy Spencer.
There is nothing special about the 2.4 ghz an oven puts out that makes water resonate. It's just the frequency allocated to microwave ovens. And yeah, originally developed to thaw out hamsters.
Balance of accessible, informative and entertaining is something we think about a lot. Unfortunately it takes way too much work to put a free to access video like this together to risk it being boring for the majority, so that dictates the tone and a lot of detail gets cut out.
Saying you have a magnetron in your microwave oven just like a WW2 radar magnetron is a bit like saying I'm driving around in the latest Toyota and it is just like owning a Ford Model T.
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What’s your favorite thing to cook in the microwave?? (The only correct answer is Beanz)
DVD's!
@@peskyparttimers8239 A friend submitted the idea of using a microwave oven as a way to quickly destroy CDR's, used in military systems in the field, after seeing me do that as a drunk demo. Never got taken up as far as I know. Technology moved on to flash drives.
@@gonzo_the_great1675 don't as you don't want to be inhaling Phosgene gas now do you.
I have repaired both SO and SJ radars. When working properly they were pretty good. On the short range you can see individual pier pillings!
Many were sold to San Diego based tuna boats. And we're in service till the mid 70's.
This is like that excellent engineerguy video, except with entirely different delivery and historic examples 😊 love your enthusiasm for everything!
Nah, microwaves were invented to reheat frozen hamsters
I thought that was an odd comment, but turns out it’s true!!
DotT!
I never thought I'd have to thank Heinrich Hertz for the Beatles. Wow. Danke Heiner 😂
James Lovelock’s previous gig before inventing Gaia theory!
@@hackmodular If I recall correctly Raytheon made a Radar Oven
I have spares for a Marconi Radiolocator Mk IV Radar from a 1950s merchant navy ship, which includes the magnetron, Klystron and Trigatrons. Even have the servicing log book detailing all the repair work carried out during its service! There was even a huge spare magnetron magnet but as a child, I got it stuck quite firmly to my father’s Caterpillar earthmover. It didn’t come off in one piece….
you guys need to get a few mercury arc rectifiers!!!! thats the birth of the vacuum tube
Please more videos... fabulously narrated! Perfect Sunday with a brew ☕
A very clear description of the working of a magnetron. Well done!
@@grahamspinks4801 much appreciated, Graham - not the simplest thing to explain from scratch!
Amazing, would love to see more of the WW2 tech. Thank you.
Love me some Vacuum Electronics! Travelling Wave Tubes were my bread & butter for a couple of decades.
I think WW2 and Cold War technologies are very interesting topics, I hope there will be more content on these topics.
0:55 I remember using an ex-military 'portable' radio set at school. Portable as in one person could just about carry it and its heavy batteries while someone behind them could tune it in and speak to the others on the exercise. It was theoretically also possible to listen to the VHF TV of the time or even the fighter aircraft on exercises but we'd never do that, honestly. And nobody would have even thought about pressing the transmit key when on those frequencies.
Dude knows exactly what makes for a good friday night.
I used to have a cool coffee mug from the Computer Museum in Boston. It had a gold matrix/grid pattern all around it. I regularly filled it with water and heated the water in my microwave. One morning I wasn't quite awake and put the empty mug in and set the timer for 2 minutes. Sparks flew everywhere off the gold design! I didn't know whether to run over and turn it off or run out of the room.
extremely cool, cant wait to come visit again
thats a great explanation.
These videos are amazing
good thing i just happened to have a microwave and two grapez lying around ... nice fireworks - but it stinks!
@@patrickhitthaler3030 grapez™️
that was great I always wondered how it worked.
It's great to hear you credit the English man that documented microwave cooking that was before the first magnetron was secretly carried to the USA when they closed a large part of a major city when they realised. I remember seeing him interviewed on uk tv many years ago he was Great.
And I thought it would be about spread spectrum frequency hopping. (Thanks Hedy Lamarr!)
Hope there was no beryllium or other toxic shit inside.
Always appreciating a lovely collection of Nixies, VFDs, EL displays - and other readouts.
"Most magnetrons contain a small amount of beryllium oxide, and thorium mixed with tungsten in their filament. Exceptions to this are higher power magnetrons that operate above approximately 10,000 volts where positive ion bombardment becomes damaging to thorium metal, hence pure tungsten (potassium doped) is used. While thorium is a radioactive metal, the risk of cancer is low as it never gets airborne in normal usage. Only if the filament is taken out of the magnetron, finely crushed, and inhaled can it pose a health hazard."
Don't crush up the ceramic parts of a microwave magnetron, and assume there *might* be beryllium and thorium about, so wash your hands after handling them. The hazard is real, but relatively low.
I was working with old bendix RDR-1E, one time I was sure that something was rattling inside, after lots of time I found out it was a tool in the drawer at the bench moving after the magnet.
Would be great to see more on the transmitters.
A common LC resonant circuit, though the inductors (round cavities) and capacitors (parallel walled gaps) are formed a bit different at these frequencies.
I have a Soviet version of those radar magnetrons, though the biggest one I’ve seen in person is a MC567 which was used in a large radar station from the late 60’s to the late 80’s. It’s big enough that it needs water cooling to function.
And by the way, the melting candy bar story first appeared in a 1950’s Readers Digest magazine, so it’s a pretty apocryphal story, the heating effects of magnetrons had been known before this, people used to keep their hands warm from the output.
Airplane = Precision woodworking tool.
Letting you know in the comments that I'm definitely interested in videos about those other things, especially the recon camera.
A very interesting video! Love to see a real magnetron from inside!
About baked beans: forget Heinz, find some baked beans called "prebranac", it's food of the gods! :)
Great as always! I'll be in th UK next June and hope to come pay you a visit at the museum!
Definitly more ww2 radar and radio tech please!
I dunno I can still hear the distintive whine if a flyback and the horizontal or was it vertical? circuits of old tvs which were up there in the audio range
Yes, more ww2 stuff please
Lots of RF magic going on in a magnetron. Notice the several jumper wires all welded to one solid block of metal, it won't work without them.
On of my earliest and formative internet experiences was stumbling upon an explanation on how to hack microwave ovens to work with the doors open to misdirect NATO bombings in ex-Yugoslavia. The site had loads of experiments with microwaves, like CDs, toothpicks, all very very dangerous.
The UK has some amazing spy stories, I'd like the museum to dig into real but obsolete hacks and gadgets. There used to be an area of London that had shops that had these in the window, I remember being puzzled looking into them as a kid. Actual spy stuff. But you know, (not) obsolete. Can we have some of that on the channel?
And it's in your Microwave Oven! It's a Cavity Magnetron!
Ive seen the domes at dover and there used to be pylons south of Crewkerne.
4:50 If you want to see someone powering up a mercury rectifier similar to those thyratrons there’s a video on photonicinduction ch and Mr Carlson’s Lab powered up a vacuum tube(valve) of similar size recently.
@@charlesmurphy5644 photoinduction is the best!
What about using marshmallows, or strips of cheese to measure the wavelength of the microwaves, and then calculating the speed of light from the wavelength and the frequency of the microwaves
For the history of the development of radar during WWII, check out the history trilogy for the U.S. Signal Corps: The Emergency, The Test and The Outcome.
Great BBC documentary on this subject. From the late 70's, so many of the original invertors still alive to give interviews:
ruclips.net/video/GJCF-Ufapu8/видео.html
The radar episode starts 49mins in.
Great technical description.
I was just typing the anecdote about the S&W revolver cylinders being used as drill jigs, as you mentioned it.
Tom Scott did a piece about Percy Spencer.
Ever listen to Lou Reid's Metal Machine Music? No natural instruments were used. 4LP sides, the last doesn't end.
Thanks!
@@sphinxverdant9649 hey thanks very much!!!
Hey Mate We call him beans In the USA
There is nothing special about the 2.4 ghz an oven puts out that makes water resonate. It's just the frequency allocated to microwave ovens. And yeah, originally developed to thaw out hamsters.
Wy would you freeze hamsters and wy would you thaw them afterwards... They would be not alive by then lol
@NinoJoel Cryogenic resuscitation research. They didn't ALL die.
@@JosiahGould now that's something I should have expected but didn't 😅
The ones used in the modern microwaves are most likely more advanced.
Excellent video, but air-plane? You'll be saying soder next...
When a vacuum tube gets an air leak it will burn out the filliment
Building a radar to detect Beanz.
有意思的历史，谢谢分享
2 of them? 😺😸
We have so many beans in Texas ... no beanz though.
We have Beanzah in New Zealand! Only we're not cool enough to use a z.
I don't get the point of using a microwave oven to heat beans (or "beanz"). Sure, it may do that well, but it doesn't help at all with the toast!
@@Curt_Sampson beanz in the toaster?? ;)
@@THISMUSEUMISNOTOBSOLETE That seem to me to work better than bread in the microwave. :-)
we have maple syrup beanz in canada
@@laurencedaoust3029 O Canadaaaa 🇨🇦🇨🇦🇨🇦🫡👌
Cool!!
How to heat up the atmosphere
Pretty nice explanation but it gives me the feeling I'm back in primary school with the tone and level of detail, hard to watch all the way through.
Balance of accessible, informative and entertaining is something we think about a lot. Unfortunately it takes way too much work to put a free to access video like this together to risk it being boring for the majority, so that dictates the tone and a lot of detail gets cut out.
Magnesium or radium?
Ah the audio got muted somehow! It was Sulfur Dioxide!
It's very intereting . May I know your business email for a sponsorhip collabration ?
that crt uses electrostatic deflection 🤭
"Birmingham, U.K.... [not] Alabama". Don't worry: No American thought you meant Alabama. 😛
They made parts of the Saturn V, Shuttle, ISS & SLS near Huntsville!
@@THISMUSEUMISNOTOBSOLETE I hadn't heard of that before! Very impressive! And here I was just trying to poke some good-natured fun at Alabama. 🙂
More World War 2 Tech.....how many of you are going to the grocery store to get grapes....?
I worked on microwave electronics in the mid 80s. Definitely some dark magic going on there
Saying you have a magnetron in your microwave oven just like a WW2 radar magnetron is a bit like saying I'm driving around in the latest Toyota and it is just like owning a Ford Model T.
I am the first
No, you are not 😂
Do you have to be so dramatic in your presentation👎👎👎