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Ha ha! They put Kilroy in the amplifier (upside down under the microscope between the pair of splitter/combiners). This is amazing. I can't wait to see what you do with millimeter waves!

There are a lot of sophisticated and successful businesses that do not have half the capability of your home lab. Stunning! As always, thanks for sharing. So much to learn, so satisfying.

"Leave some comments about what kind of experiments you want to see." This setup is pretty exotic to me. I understand what it does (functionally at least), but I'd like to hear about what sort of experiments are even possible to do with this. I have only the vaguest idea.

Great! Thank You for the demonstration and the look inside.

Awesome video, as always. Thank you.

The 83752 has a multiply function. You can set the multiplication factor, of the multiplier, in there and it will display the correct frequency, so you don't have to do the math.

Super nice video. Thanks ! I don't believe I've seen something like this anywhere else.

That's great I love those videos. The best ones after repair ;)

Thank you for another amazing video!

Kilroy spotted!

Another fantastic video. Thanks, Very interesting.

Great episode, again. Thank you

Hmmm ... those look like Wilkinson hybrid splitters, before and aft of the amplifiers, and the uneven lengths of the stripline make up for each other fore and aft on each amp set ... former TI GaAs Facility MIMIC DC test engineer here

Mind blowing!

so.. complete characterisation of a tin foil hat coming soon?

Thanks for explaining the doubler! I opened one of these and surprised to see the topology and coupler implementation. If you find a broken harmonic mixer I am very curious to see one inside.

Excellent video as usual. Thank you. I wonder if you know why the substrates for the amplifier modules is different from the output Wilkinson coupler and the LPF. I also liked your little free space attenuator/ material tester.

First of all big fan of your videos! I really like how you explain the workings of every device you fix instead of just blindly fixing them. I am myself very interested in mm wave and the equipment for it. Would be awesome if you could also design and build some of this stuff and make it maybe so that mmwave interested people could follow along. Stuff like a harmonic mixer or high frequency synthesizers,vcos, directional couplers, etc

Nice video

i have wanted to get some 20-40 ghz stuff going for some mm wave radar experiments but even this is way out of reach for me :P but not for everyone, great video again

I can already see some obsolete GaAs fab gear showing up at the Signal Path eventually! Keep at it man, ASIC at home is closer and closer ; )

also one thing i would love to see is some testing of cheap ebay RF absorbers

The output sub-module on the amplifier has "22GHz LPF" written on it at the top (as we see it on screen). That pretty much just leaves that tiny diode on the input of the big module as a doubler! I wonder why, after passing it through a splitter and amplifier, it was combined back again, and then split again, amplified, and recombined again, rather than being each path being amplified twice, then combined just once. Maybe the slightly different path lengths for each half-amplifier helps to reduce the average noise, but I'd have thought with the splitter+combiner losses would be quite a lot greater.

The offices of Velodyne's LIDAR division are just down the road from OML.

5:24 $150? Holy shit, that is a steal for something that big and HP branded special equipment!

@39:17 I notice that after the second stage of amplification there looks to be an adjustable pad. The traces leaving the second stage are staggered slightly as they make contact with the combiner on the pad. Do you have an idea what this physical adjustment is for?

A bunch of metal blocks and pipes. Imagine what extraterrestrial tech looks like, if ET even USES any electronics, at all.

I would love to see you buy some UHF vacuum tubes and put together an oscillator using one, and comparing it to something solid state. 6AN4 tubes for example can push close to 900mhz and cost about $6 each. a 2c42 tube can push over 1750W at 1050mHz and is about $40 (although you need close to 1000 volts for the power supply so that's an issue). It may be practically DC compared to the frequencies you operate it, but I still think it would be interesting to see your expertise put towards something so vintage.

39:00 killroy was here!

Thanks for this teardown. Definitely answers some questions on my end as well. By the way, this setup can also use the older syn. sweepers as well. I personally have the 8340B as the source for this system setup back in our hometown (far away at the moment). You can also put an isolator (U365A) for the impedance mismatch if doing over air experiments. Kilroy was a nice touch. Interesting story on kilroy was that the kilroy art was popularized during WWII. However, it actually represents a symbol of an even older war. WWI. The thinking at the time may have been that WWII would also include trench warfare like WWI (the French thought this would happen). Another thing Kilroy could stands for is a soldier/commander (could be the enemy too) peeking over nosying about on what is going on in the field. Forever watching for you or against you. Was great psychological warfare/propaganda. (In this case, I'd like to think for you in goodwill for your experiments.) At least that's what my grandfather would tell me. Its all debatable since the people who know have unfortunately long passed their expiration date. Rest their souls and that of my grandfather. This is why teardowns of these older equipment are so awesome. Its a sad day when our younger set doesn't know how we got to where we are today. Much appreciated.

Why would they use steel for the waveguide module instead of another metal that’s more conductive and easier to machine? Presumably, steel has some other desirable properties?

👍👍

Can you give us any insight into the cost of such a setup?

did you ever try modulating your voice over the "Air" on any of these GHz frequencies?

Nice tear down. Crazy that you can buy a full V band I/Q up and down converter, with synth, in a pair of chips; specifically the HMC630x.

What is the difference between a signal generator and a synthesizer?

Beautiful.. I love this channel At what power level can your finger actually "feel" the high frequencies? As far as what to test, why not see how well the rf absorbing material actually attenuates *i would really love to see rf adsorption material vs conductive foam -REAL- conductive foam, not that cheap stuff you get with chinese chips thats just colored black but has no conductivity Anyways, may the universe bless you on this selfless endeavour!

Can you please measure Ultem 1000 dielectric constant near 40 GHz ?

These were knick-named “the armadillo” :-)

at 5:16 you claimed the hardware was a 20-40ghz Amp, but, it says right on the label 2-20Ghz

But how do anyone work with UHF (300GHz + ) ?

I’m still at a bit of a loss what those high frequencies are used for.

How long before the home lab surpasses the house value? :D

You really could need multiple cameras to then edit a picture in picture or just cut to another angle

Very nice but fat chance of finding any of this gear in Australia. EBay just has over priced junk attached to exorbitant postage costs. So I guess we must be satisfied watching Utube.

great video but less holding stuff up to/moving the camera in real time would be nice

Generate mm waves ans then spend a fortune to get cables, connectors, components and devices to test.

26.5 GHz is not mm-wave it starts at 30 GHz

first