FINALLY!!! TSP has encountered a scenario I can readily relate to... As amazing as this might seem, just like TSP mentions @ 4:20, I _ALSO_ "don't happen to have a 75GHz-110GHz source that I can turn on right now" The fact that I could barely scrape together a 50Hz source to turn on (yes, I really mean 50Hz and not 50GHz!) is another matter entirely!!! I guess I could 'cheat' and say that I do have ready access to a high power (around 1kW) 2.4GHz 'source' that I can turn on at will. It's even got a little light inside, a turntable and a fairly rudimentary timer. It was built by Panasonic. It comes in REALLY handy when I want to reheat last nights dinner! Footnote: Despite the above, I still DROOL at the little tidbits of info within a TSP video that my tiny brain can actually comprehend! I tend to concentrate my efforts towards the 'DC' end of the spectrum and leave the 'daylight' end of the spectrum to TSP et al
Hmm. Pretty sure Pooch is a 75-120 Ghz signal source in the lab. I call foul on the termination preconditions. You'll need to finish the 75Ghz VNA build to convince us :)
Would have been good to see the setup on the bench attached to the spectrum analyser, and not just the instrument's screen. I'm curious how the mixers, waveguides, etc all fit together. I would guess for most viewers, you could skip it for lower frequency setups (SMA coax etc) but for mm wave, those practical matters are rather important.
Aww Gee, I was hoping we would be able to see an emerald green glow inside the waveguide. As time passes usable frequencies are getting higher and higher and components are getting smaller and smaller, or more appropriately physics-al. At 100 GHz we are only a factor of 3 away from 300 GHz which some consider the lower end of Far Infrared radiation which I guess could be defined as the boundary between electronics and optics. What magic awaits us in that last 200 GHz?
That is actually something that I tought a lot about while studying. I am perfectly fine with electronics, with the "normal" model of electrons doing their thing. I'm also fine with optics, with photons being massless and doing their thing. However the "border" or lets say the way that one goes into the other is still somehow mysterious to me. Since electrons and photons have somewhat different properties, it is hard for me to imagine that they are both a different model for the same thing. Of course they are both only a model so this might already be the answer but I still find it fascinating. @ TheSignalPath Maybe you can do a video on this topic, how everything works togehter and how optics and electronics are somehow a different model for the same thing at other frequencies?
Look at the TSP#45 at 43 minute. That experiment, they are using to stress test that oscilloscope, was much more interesting to me than that oscilloscope itself, because it crosses boundaries between the light and microwaves. The first thing I was thinking about when I saw it was something like "That principle is crystal clear and I always belive this is possible, but I didn't know this is nowadays practically possible."
@@gammaleader96 They're manifestations of the same thing: electromagnetic radiation. Your own body emits electromagnetic radiation in the form of infrared, which is how the PIR sensors on security lights sense your movements.
"In a parallel universe somewhere" is as good a theory as anything. I have this idea that all these little round things should actually be made out of hex stock so that they stand a chance of not rolling into the next time zone when dropped.
I've never understood why noise sources use BNC connectors for power since the chance for mis-connecting something could be high if one isn't careful; maybe it's an industry understanding that no one would ever make that mistake. As a hobbyist I'd never mix power and signal connector types. Thanks for sharing!
Real noise sources use BNC because noise figure meters / test instruments use a 24v BNC connector for pulsed on (hot) and off (cold) to generate the ENR (excess noise ratio) intuitive the DUT.
@@davidalangordon Yeah, I have a good noise source and was surprised when it arrived with a BNC connector on the power end and a SMA at the output...took me a minute to figure out what was going on! Thanks for taking the time to comment.
Nice video. I think the characteristic impedance of WR-10 waveguide would be closer to 500 ohms. I’m not sure what the impedance of the horn looks like though…
The pyramidal shape makes a decent transition from the free-space 376ohm into the 500ohm region. Actually circa 600ohm at 75GHz and circa 450ohm at 110GHz. A std horn is usually a quite decent matched termination for the waveguide. (Always better to talk about return loss or matching as on waveguides we don't usually use ohms anyway)
I'm sure you're aware, but in case you're not, all workshops naturally develop a small black hole. If you're ever on the other side of it, would you mind picking up the #8-32 tap I dropped? It has been about 20 years.
Amazed someone would toss a multi-grand module without even trying to replace the power connector. Perhaps they, too, had no way to test it after the "accident". (at 75GHz, the slightest dent would mess it up.)
Would it make sense using 2nd or 3rd harmonic from a previously characterized RF generator and use it as a "casual source" for this task? I'm aware the signal might be weak, but good enough for a an amplifier with decent sensitivity. Just a thought.
This is cool, but you havent actually proven that it works though. The output noise does not necessarily mean that the input is actually amplified. Its a shame that NFs in this band is already quite high, otherwise putting a hot frying pan in the main lobe of the horn would have been an interesting noise source ;-)
What, no 110GHz spectrum analyzer?? ;-) External harmonic mixer is cheating! What about step recovery diode/nonlinear device along with like 20GHz signal generator to make harmonics up to 100GHz? So there is a peak/peaks and not just noise on spectrum analyzer...
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Nice when the repair is something on the DC side rather than mm-wave side hehe
FINALLY!!!
TSP has encountered a scenario I can readily relate to...
As amazing as this might seem, just like TSP mentions @ 4:20, I _ALSO_ "don't happen to have a 75GHz-110GHz source that I can turn on right now"
The fact that I could barely scrape together a 50Hz source to turn on (yes, I really mean 50Hz and not 50GHz!) is another matter entirely!!!
I guess I could 'cheat' and say that I do have ready access to a high power (around 1kW) 2.4GHz 'source' that I can turn on at will.
It's even got a little light inside, a turntable and a fairly rudimentary timer. It was built by Panasonic.
It comes in REALLY handy when I want to reheat last nights dinner!
Footnote:
Despite the above, I still DROOL at the little tidbits of info within a TSP video that my tiny brain can actually comprehend!
I tend to concentrate my efforts towards the 'DC' end of the spectrum and leave the 'daylight' end of the spectrum to TSP et al
Hmm. Pretty sure Pooch is a 75-120 Ghz signal source in the lab. I call foul on the termination preconditions. You'll need to finish the 75Ghz VNA build to convince us :)
Do u have a link to the VNA Build video?
I’m glad It worked, but I also wanted to see it pulled apart!
Me too. I’ll look for more stuff to take apart. :)
Would have been good to see the setup on the bench attached to the spectrum analyser, and not just the instrument's screen. I'm curious how the mixers, waveguides, etc all fit together. I would guess for most viewers, you could skip it for lower frequency setups (SMA coax etc) but for mm wave, those practical matters are rather important.
It was accidentally cut from the footage. I’ll show it next time.
@@Thesignalpath Yes, please!
Aww Gee, I was hoping we would be able to see an emerald green glow inside the waveguide.
As time passes usable frequencies are getting higher and higher and components are getting smaller and smaller, or more appropriately physics-al.
At 100 GHz we are only a factor of 3 away from 300 GHz which some consider the lower end of Far Infrared radiation which I guess could be defined as the boundary between electronics and optics. What magic awaits us in that last 200 GHz?
That is actually something that I tought a lot about while studying.
I am perfectly fine with electronics, with the "normal" model of electrons doing their thing.
I'm also fine with optics, with photons being massless and doing their thing.
However the "border" or lets say the way that one goes into the other is still somehow mysterious to me.
Since electrons and photons have somewhat different properties, it is hard for me to imagine that they are both a different model for the same thing.
Of course they are both only a model so this might already be the answer but I still find it fascinating.
@ TheSignalPath
Maybe you can do a video on this topic, how everything works togehter and how optics and electronics are somehow a different model for the same thing at other frequencies?
Look at the TSP#45 at 43 minute. That experiment, they are using to stress test that oscilloscope, was much more interesting to me than that oscilloscope itself, because it crosses boundaries between the light and microwaves. The first thing I was thinking about when I saw it was something like "That principle is crystal clear and I always belive this is possible, but I didn't know this is nowadays practically possible."
@@NikiBretschneider Thanks, I will take a look. :)
@@gammaleader96
They're manifestations of the same thing: electromagnetic radiation. Your own body emits electromagnetic radiation in the form of infrared, which is how the PIR sensors on security lights sense your movements.
"In a parallel universe somewhere" is as good a theory as anything. I have this idea that all these little round things should actually be made out of hex stock so that they stand a chance of not rolling into the next time zone when dropped.
Cool!!😄📡 That was a quick Winn 😁👍
I've never understood why noise sources use BNC connectors for power since the chance for mis-connecting something could be high if one isn't careful; maybe it's an industry understanding that no one would ever make that mistake. As a hobbyist I'd never mix power and signal connector types. Thanks for sharing!
I assume such devices have terrible PSRR so any noise picked up by normal cables (not twisted pair or coax) will feed right into the output
@@NavinF Now that makes sense...thanks.
Real noise sources use BNC because noise figure meters / test instruments use a 24v BNC connector for pulsed on (hot) and off (cold) to generate the ENR (excess noise ratio) intuitive the DUT.
@@davidalangordon Yeah, I have a good noise source and was surprised when it arrived with a BNC connector on the power end and a SMA at the output...took me a minute to figure out what was going on! Thanks for taking the time to comment.
Nice work on the repair.
What is the external mixer?
Power over BNC for the win!!
Good job saving that component. Great video thanks.
Nice video. I think the characteristic impedance of WR-10 waveguide would be closer to 500 ohms. I’m not sure what the impedance of the horn looks like though…
The horn is a pretty good matched load (as long as there is nothing within its near-field range).
(Shahriar, I imagine you wanted to say matched load, (which is 500-Ohm (and not 50)).
The pyramidal shape makes a decent transition from the free-space 376ohm into the 500ohm region. Actually circa 600ohm at 75GHz and circa 450ohm at 110GHz. A std horn is usually a quite decent matched termination for the waveguide.
(Always better to talk about return loss or matching as on waveguides we don't usually use ohms anyway)
Yes.
Video request: Maybe you can make a video explaining how the RCWL-0516 works and if it is really using doppler or another effect.
I'm sure you're aware, but in case you're not, all workshops naturally develop a small black hole. If you're ever on the other side of it, would you mind picking up the #8-32 tap I dropped? It has been about 20 years.
how was the spectrum analyzer connected to the amplifier ??
Hi, what applications are these kind of amplifiers with this frequency band are used for ?
Thanks for sharing! How to calculate the noise？I can't find the relevant formula。
I’ll make a video about noise.
Did you already release the video on the 110GHz network analyzer?
Not yet…
Starting from which frequency do you expect a lab to be interference free? I work below 2 GHz and find interference everywhere
Amazed someone would toss a multi-grand module without even trying to replace the power connector. Perhaps they, too, had no way to test it after the "accident". (at 75GHz, the slightest dent would mess it up.)
Place a couple of aluminum plate reflectors between the horn and the input port, see if you can get it to oscillate. Regenerative 100GHz receiver???
04:21 "I actually don't have a 75 to 110 GHz source".
Now that's disappointing. 😛
Unexpected and unacceptable! :)
Would it make sense using 2nd or 3rd harmonic from a previously characterized RF generator and use it as a "casual source" for this task? I'm aware the signal might be weak, but good enough for a an amplifier with decent sensitivity. Just a thought.
Point it at the sun!
Amazing content 💯🔥
very interesting👏👏
This is cool, but you havent actually proven that it works though. The output noise does not necessarily mean that the input is actually amplified. Its a shame that NFs in this band is already quite high, otherwise putting a hot frying pan in the main lobe of the horn would have been an interesting noise source ;-)
Looks like something they found in Roswell
Is the E36313A power supply new to your bench?
It has been there for about a year I think.
Awww.. no disassembly .. sniff.
I know BNC connectors aren't that great for really high frequency, but DC? That's savage.
Several 1000 of dollar for that little thing?! Dam..
Just precision *connector* for that little thing is 1000$ or more...
Price per increased GHz is logarithmic :-)
@@Vintaginside That is so true. :)
@@xDevscom_EE Got a point there.
@@Vintaginside When you look at the cost of the >10GHz equipment, you could see it too.
A used 4-channel scope going up to 22GHz costs over $50,000.
You are always only fixing connectors! 🤣
Sometimes its loose cable :)
Yes, dont forget the loose cables haha. Its funny but not accurate tho, he has fixed many rf problems too 🙂
👍🙏💖
What, no 110GHz spectrum analyzer?? ;-)
External harmonic mixer is cheating!
What about step recovery diode/nonlinear device along with like 20GHz signal generator to make harmonics up to 100GHz?
So there is a peak/peaks and not just noise on spectrum analyzer...
Even if I did generate harmonics, I still need to get that into a waveguide transition…
another broken component that is nearly too easy to fix...