it almost took me a minute to figure that out, I thought it was interference or some weird crosstalk from my audio setup, which currently does "things".
Even more strange is I was watching a live eagle cam on here earlier and the same interference came through. I've not heard that in years. VERY strange
either I am stupid or this test kit costs more than any individual can afford today, specialized connectors, specialized components, specialized chips in sockets, goddamn. Are they so cheap because of the SDR and chips that can do such things?
@@D4no00 these things take a lot of effort to design and they won't sell to many of them. The parts are of course also quite expensive but if a large proportion of what you are paying for is engineering time spending additional time optimizing production could would only make it more expensive. I don't this is much of problem, of course it would be nice if test was more affordable but as it isn't possible for an individual to design most these things and get them into production I don't think it has be possible for and individual to afford them
@@timun4493 I guess you are right, I always miss the price of engineering since I come from a third world country where capable engineers get paid cents for their work. I suppose the electronics industry is going the same way as software, there will be created tools that will do the hard work for you and all you will do is select the blocks you require for it to work, of course at the price of custom modifications. I mean compare a simple software for checking the connections and clearance of a board, it is scalable even to the most complicated of the boards, and such processes can be applied to most of the design.
I now watched the video, and the circuits have “Oulu” written all over it. In the early nineties, Nokia was a forerunner in many things wireless, but NMT and GSM infrastructure in particular concentrated around Oulu and Haukipudas, both in Northern Finland. For some reason, a bunch of RF gurus cluster together in Finland, practicing their voodoo art. Elektrobit is rooted in Oulu, Finland too. People crossed the Nokia/Elektrobit fence regularly, in both directions. Nokia cellular infrastructure PCBs - both digital and baseband - look totally cut from the same cloth, also because Elektrobit worked as a subcontractor on some of the Nokia designs. I did the receiver of the TETRA transceivers, and the specs were VERY hard to meet in production. These Propsims were also (probably mostly) used in production tests, and I still have nightmares from fighting with them in a Nokia production facility in Äänekoski, of course also in the middle of nowhere in Finland.
I would have put Oulu in Western Finland rather than Northern Finland! Is Elektrobit still in business there? Might expand my job search to include them as they haven't turned up in my searches so far.
@@cambridgemart2075 The radio related part of Elektrobit is called Bittium today. Elektrobit also exist, but is automotive SW. Both still present in Oulu.
Just early nineties? I would say the forerunning would've run from the late 80s to around 2010 :P First commercial digital (e.g. GSM/2G) network was launched in Finland in 1991.
I used one of those things too, when working at Nokia developing TETRA transceivers, poetically named TTRXes. Our Propsims were part of a much larger unit, called TERESA, a Tetra specific test unit, also made by Elektrobit. Those things were incredibly finicky (Finnish, too, but that’s another matter), expensive and mightily expensive.
Thank you for the TTRX. They're popular amongst hobbyists nowadays for conversion into amplifiers. We provide power, tap for bias and then provide an input - Tons of decent write-ups on the web. Whenever I see one for sale I buy them just on the basis of the effectively infinite capacity of the heatsink!
@@digitalradiohacker Very cool, being a HAM myself, I would buy one, or more, in a heartbeat if they came up for sale for an amount anything close to reasonable. About the heatsinking - the early versions had machined heatsinks, but we had to move to extruded aluminum because it made higher fin density possible, since cooling was actually inadequate, although because they saved a penny, too. And that is with huge PAPST fans kicking up a hurricane from the bottom of the cabinet. Another non-obvious challenge was that the power transistors were mounted (and had to be mounted) longitudinally to the fins, meaning that the "top" transistor got "preheated" air from the "bottom" transistor, and the top transistor was harder to discipline over the temperature range because the linearity requirements for the power amplifier were very tough. In a push-pull configuration, you easily get 2nd-order distortion with the tiniest of imbalances and the delta in heatsinking was enough to make it a nightmare. ACP (adjacent channel power) was one of the tough specs, IIRC -60dBc, partly because because TETRA was basically a digital system to be overlayed on an analog 25kHz grid, and ETSI says you gotta stay in your lane.
@@bertholtappels1081 There was a time when I had quite a few of these units kicking around here, but I had to downsize and raise some money and sold all but one. The one I have remaining has no machining marks on the heatsink fins, so it must be what you describe as a "later" version. What is hilarious, is that you guys were struggling with a "small" heatsink, and years later, I buy them up for when I need SERIOUS cooling for a battery analyzer project etc. It also seemed odd to me that the base stations ran such "high" output power compared to the handsets (which run around 1W). Presumably, it lets the mobile stations build a list of "cell improving" sites long before the mobile ststions can actually talk to them. Another amateur was doing some experiments with the DSP boards - I think he'd figured out some kind of AT command structure? I donated my DSP board to him because I had more than enough projects on the stove. Unlike most infrastructure, which is usually useless outside of its designed use, the TTRX is still highly sought after for all kinds of uses.
Brings back memories of developing UMTS node-B firmware for Motorola before China screwed us over. We had ridiculously expensive Ubinetics mobile simulators before any actual phones existed.
Looks like the product datasheet is still available (search "ChipExpress CX3000"), and they offered them at least until the mid-2000s. They even offered 1 week turnaround times for prototyping. FPGAs were around in the mid to late 1990s, but I'm guessing this service was either cheaper or offered better capabilities? "The CX3000 technology features high density (10K gates/mm2) and logic capacity of up to 1.5M gates. This high density results from utilizing a fourlayer metal interconnection, enabling competitive prices for high-volume production. Additionally, the CX3000 technology features extremely low power dissipation of 0.3µW/MHz/gate, and a unique voltage flexibility utilizing a dual-oxide process that allows operating with solely 5V Vcc. This product family offers up to four embedded analog PLLs."
12:40 Looks like a balun type circuit, taking the single ended input signal from the right side and splitting it into two, each going to their own separate amplifier chains.
I love your teardowns! You talk about so many interesting aspects and own experience, its really interesting. You find very cool stuff, but you probably can teardown something ordinary and it would be quite interesting still ;)
Gotta love how all of that tech can now be shoved into an A/D, FPGA and D/A, most likely on a single board. Want to simulate some multipath? Cool, just mess with the phase in software, and kick it out to the D/A. 12:38 Mixers and pre-amps :)
How are they processing signals in the GHz range with 100Mhz DACs and digital logic? Do they mix it down to some lower IF and then upconvert to RF again? I expected this to be a box of RF filters, switches and noise generators!
Are those IDT RAMs dual ported? There are some rather interesting applications for dual-port RAM, as it can be written to and read out simultaneously. Some DSPs have an amount of it built in. I've heard of people using them to program EPROMs and microcontrollers, using one port to write the memory and another to program the device.
they seem to throw away so much on upgradability to never use it. that chip in the socket is BQFP. probably a lot more likely to be dropped being in a socket.
Quite an interesting equipment; funny how early it was - the TMS320C50 was a very powerful DSP in the 1990s. Elektrobit was a big cellphone ODM for Nokia.
That was super interesting, Mike. Thanks for producing this video. Yes, bummer there wasn't much of any RF black magic in there. I always enjoy your vids and they are a highlight of my day. Cheers!
There's a lot of zener based noise generators on eBay from China. It's a shame the one in this unit didn't have something way more interesting in it. Funny you were able to get the unit for 130 pounds in the UK. US Ebay these are being listed for $14K+ good luck to the sellers.
eBay is a collection of "sellers" most of whom have no idea as to how to run a sales business.. so it's dominated by egos, belief that "surely someday someone will buy it" and other misguided ideologies haha.. very wasteful. Most of them don't value "turnover" at all. I do save substantial money for my business now and then with bulk eBay purchases, but mostly due to sellers not knowing what they have. It's very rare that I hit a "mutually beneficial" deal, where I feel that I got decent value, and the seller did as well. Kind of sad..
@@oriole8789 You can say that again. I stumbled across some interesting obsolete parts last year. The seller had hundreds of packs of these things and hadn't sold a single one. I made a reasonable offer on a couple of them. The guys response was that he couldn't afford to take a couple of dollars off the price. I just moved on with my life :)
Those Chinese noise sources are scary, they run very hot , have a pretty large output power. I would definitely wear protection before getting it on the end of my spectrum analyser
@@vincei4252 I know exactly what you mean. There's a pattern where people just dig in their heels, refuse to budge, and the items remain in their stores for years.. collecting dust, taking up space and depreciating further. If your item doesn't sell within a *year*, you should really reconsider your price. My personal patience level for sales is a few months at most. I messaged some seller to let them know that they're selling old stock items at 2-10x above full retail prices, pointed them to authorized distributors with listed online prices, and they still didn't budge. Their last response was a passive aggressive "You're such a nice person." haha. I don't even know what to make of that. ;) Gotta move on with your life, like you said!
It looks like the CX3000 devices are specified as dice rather than packaged devices, although CE do manufacure packaged devices. The CX3301 has 150k gates, 144kb memory and max 424 I/O (all pins count as I/O), clearly the version in that unit doesn't utilise all of the I/O as you observed on the die.
Are you going to do a teardown of the Kodak HG2000? that you showed on the live zoom, would be fun to see, because i got one myself! pretty impressive thing has a built in 386 processor inside it
I think he already has older videos about it, and www.electricstuff.co.uk/ektapro.html. I have known about that FPGA replacement project for a long time, but I never realized it was also MikesElectricStuff - heh! Of course it is!
@@gorak9000 That's not the camera i meant he has picked up recently i think, a Kodak HG2000, that one can record on its own, that one you linked is a Kodak Ektapro 1000 TR, thanks anyways =)
@@mikeselectricstuff I see, i have to check the motionscope video out, just a heads up i did something in terminal with that camera and typed 'l' and enter if i remember correctly was 2 years ago, when i did that it ereased everything from the flash memory without asking. Luckily i had a dump of everything and could re-flash it !
Considering how much 'free' space there is on those custom spun chips makes you wonder if they could have condensed the BOM a bit better by better utilising the silicon space..... There must be a reason of course that would make sense if all the facts were available. But on face value it does seem odd that they were happy to leave soo much silicon space unused all the same!
I'd suspect that they had the tooling for that die size and it worked out cheaper to just bang everything out in the same form factor rather than retooling.
Commenting about the disappointment about it being all digital... This thing seems to have been made about 10 years after the first digital cellphone (and network), so I don't know if it should really be a surprise the test gear wouldn't be up-to-date too.
Totally understand that when buying uncommon kit like this you are rolling the dice as to how useful it might be and if worth buying at all. Would like to know what you can/will salvage from it?
Thanks for another interesting teardown! These mobile RF test units are always disappointing, there's nothing reusable in the agilent 8960 series systems either.
Found a short datasheet for the Advanced Gate Array from Chip Express link: www.digchip.com/datasheets/download_datasheet.php?id=245082&part-number=CX3003
6:20 - The ghosts of the WCDMA phones that thing tested are leaking through the ether.
Best comment haha
I was thinking the same thing!
it almost took me a minute to figure that out, I thought it was interference or some weird crosstalk from my audio setup, which currently does "things".
Even more strange is I was watching a live eagle cam on here earlier and the same interference came through. I've not heard that in years. VERY strange
@@cmas5854 my phone still makes interference but not that exact interference
I love these specialised bits of industry test kit, always very interesting!
either I am stupid or this test kit costs more than any individual can afford today, specialized connectors, specialized components, specialized chips in sockets, goddamn. Are they so cheap because of the SDR and chips that can do such things?
@@D4no00 these things take a lot of effort to design and they won't sell to many of them. The parts are of course also quite expensive but if a large proportion of what you are paying for is engineering time spending additional time optimizing production could would only make it more expensive. I don't this is much of problem, of course it would be nice if test was more affordable but as it isn't possible for an individual to design most these things and get them into production I don't think it has be possible for and individual to afford them
@@timun4493 I guess you are right, I always miss the price of engineering since I come from a third world country where capable engineers get paid cents for their work. I suppose the electronics industry is going the same way as software, there will be created tools that will do the hard work for you and all you will do is select the blocks you require for it to work, of course at the price of custom modifications. I mean compare a simple software for checking the connections and clearance of a board, it is scalable even to the most complicated of the boards, and such processes can be applied to most of the design.
Dave, what are you doing here? You're not allowed to watch videos!
it always makes my day when mike uploads a video of a tear down of interesting electronics, just need to grab a coffee
I now watched the video, and the circuits have “Oulu” written all over it. In the early nineties, Nokia was a forerunner in many things wireless, but NMT and GSM infrastructure in particular concentrated around Oulu and Haukipudas, both in Northern Finland. For some reason, a bunch of RF gurus cluster together in Finland, practicing their voodoo art. Elektrobit is rooted in Oulu, Finland too. People crossed the Nokia/Elektrobit fence regularly, in both directions. Nokia cellular infrastructure PCBs - both digital and baseband - look totally cut from the same cloth, also because Elektrobit worked as a subcontractor on some of the Nokia designs. I did the receiver of the TETRA transceivers, and the specs were VERY hard to meet in production. These Propsims were also (probably mostly) used in production tests, and I still have nightmares from fighting with them in a Nokia production facility in Äänekoski, of course also in the middle of nowhere in Finland.
I would have put Oulu in Western Finland rather than Northern Finland!
Is Elektrobit still in business there? Might expand my job search to include them as they haven't turned up in my searches so far.
@@cambridgemart2075 The radio related part of Elektrobit is called Bittium today. Elektrobit also exist, but is automotive SW. Both still present in Oulu.
@@ErlingStage Thanks, Bittium are on my list already. Appreciate the information.
Just early nineties? I would say the forerunning would've run from the late 80s to around 2010 :P First commercial digital (e.g. GSM/2G) network was launched in Finland in 1991.
Oulu or Salo Finland. Mainly Oulu.
sounds like your phone is trying to make contact with it at the 6 min's mark.
I used one of those things too, when working at Nokia developing TETRA transceivers, poetically named TTRXes. Our Propsims were part of a much larger unit, called TERESA, a Tetra specific test unit, also made by Elektrobit. Those things were incredibly finicky (Finnish, too, but that’s another matter), expensive and mightily expensive.
Thank you for the TTRX.
They're popular amongst hobbyists nowadays for conversion into amplifiers. We provide power, tap for bias and then provide an input - Tons of decent write-ups on the web.
Whenever I see one for sale I buy them just on the basis of the effectively infinite capacity of the heatsink!
How much did a whole rack run?
@@digitalradiohacker Very cool, being a HAM myself, I would buy one, or more, in a heartbeat if they came up for sale for an amount anything close to reasonable. About the heatsinking - the early versions had machined heatsinks, but we had to move to extruded aluminum because it made higher fin density possible, since cooling was actually inadequate, although because they saved a penny, too. And that is with huge PAPST fans kicking up a hurricane from the bottom of the cabinet. Another non-obvious challenge was that the power transistors were mounted (and had to be mounted) longitudinally to the fins, meaning that the "top" transistor got "preheated" air from the "bottom" transistor, and the top transistor was harder to discipline over the temperature range because the linearity requirements for the power amplifier were very tough. In a push-pull configuration, you easily get 2nd-order distortion with the tiniest of imbalances and the delta in heatsinking was enough to make it a nightmare. ACP (adjacent channel power) was one of the tough specs, IIRC -60dBc, partly because because TETRA was basically a digital system to be overlayed on an analog 25kHz grid, and ETSI says you gotta stay in your lane.
@@bobert4522 It's been "a while". For some illustration, it had an FSEA30 in the rack as well as one of the Anritsu vector modulation synthesizers.
@@bertholtappels1081
There was a time when I had quite a few of these units kicking around here, but I had to downsize and raise some money and sold all but one. The one I have remaining has no machining marks on the heatsink fins, so it must be what you describe as a "later" version.
What is hilarious, is that you guys were struggling with a "small" heatsink, and years later, I buy them up for when I need SERIOUS cooling for a battery analyzer project etc. It also seemed odd to me that the base stations ran such "high" output power compared to the handsets (which run around 1W). Presumably, it lets the mobile stations build a list of "cell improving" sites long before the mobile ststions can actually talk to them.
Another amateur was doing some experiments with the DSP boards - I think he'd figured out some kind of AT command structure? I donated my DSP board to him because I had more than enough projects on the stove.
Unlike most infrastructure, which is usually useless outside of its designed use, the TTRX is still highly sought after for all kinds of uses.
What no light box video? I hear those are quite popular recently. :)
Probably need a shipping container light box for an item this big.
*snort*
Brings back memories of developing UMTS node-B firmware for Motorola before China screwed us over. We had ridiculously expensive Ubinetics mobile simulators before any actual phones existed.
Screwed us over... you mean, just copied everything? :P
@@rkan2 it was called “Joint venture” at the time!
Now thats quite a few components to salvage, therapeutic desoldering evenings...
so .. how would that main 5v rail fancy spot-welding batteries ..?
those pga chips appear to be laser programmable gate arrays
theres an article easily found by googling chip express 1997
Looks like the product datasheet is still available (search "ChipExpress CX3000"), and they offered them at least until the mid-2000s. They even offered 1 week turnaround times for prototyping. FPGAs were around in the mid to late 1990s, but I'm guessing this service was either cheaper or offered better capabilities?
"The CX3000 technology features high density (10K gates/mm2) and logic capacity of up to 1.5M gates. This high density results from utilizing a fourlayer metal interconnection, enabling competitive prices for high-volume production. Additionally, the CX3000 technology features extremely low power dissipation of 0.3µW/MHz/gate, and a unique voltage flexibility utilizing a dual-oxide process that allows operating with solely 5V Vcc. This product family offers up to four embedded analog PLLs."
thanks guys!
12:40 Looks like a balun type circuit, taking the single ended input signal from the right side and splitting it into two, each going to their own separate amplifier chains.
I used to use one of those when developing first Nokia WCDMA phone yyyyears back.
Holy shit, you were a developer on those phones? That's cool as _hell._ THANK YOU, hahaha =)
Where & when? :)
@@Boyracer73 Around.... 2000...2008 Salo Finland
man, those huge boards filled with custom chips and CPLDs could all probably fit in one or two FPGAs now in 2021. Wild how fast chip technology moves!
These boards for sure look like they're made by the guys who made SGI boards for challenge and onxy! Lovely
I like the way you show us all this stuff
I love your teardowns! You talk about so many interesting aspects and own experience, its really interesting. You find very cool stuff, but you probably can teardown something ordinary and it would be quite interesting still ;)
A bit of the old applied ultraviolence.
IDCHOPPERS
Might be interesting to send one of those big ceramic PGAs to ElectronUpdate for a close inspection of the layers inside it.
Beat me to it!
DSP might have been socketed for programmability or future upgrades to an improved pin compatible DPS.
Gotta love how all of that tech can now be shoved into an A/D, FPGA and D/A, most likely on a single board.
Want to simulate some multipath? Cool, just mess with the phase in software, and kick it out to the D/A.
12:38 Mixers and pre-amps :)
So that's what those little ears on that DSP's package are for! I've only ever seen them soldered down, and I've wondered why TI chips had them.
Heeeey, I have used these when I worked for Nokia Mobile Phones testing (E)GPRS L1 receiver performance around year 2002 :)
Thanks for the video.
Always interesting stuff.
Love every new content from you.
How are they processing signals in the GHz range with 100Mhz DACs and digital logic? Do they mix it down to some lower IF and then upconvert to RF again? I expected this to be a box of RF filters, switches and noise generators!
Are those IDT RAMs dual ported? There are some rather interesting applications for dual-port RAM, as it can be written to and read out simultaneously. Some DSPs have an amount of it built in. I've heard of people using them to program EPROMs and microcontrollers, using one port to write the memory and another to program the device.
they seem to throw away so much on upgradability to never use it.
that chip in the socket is BQFP. probably a lot more likely to be dropped being in a socket.
Quite an interesting equipment; funny how early it was - the TMS320C50 was a very powerful DSP in the 1990s. Elektrobit was a big cellphone ODM for Nokia.
That was super interesting, Mike. Thanks for producing this video. Yes, bummer there wasn't much of any RF black magic in there. I always enjoy your vids and they are a highlight of my day. Cheers!
There's a lot of zener based noise generators on eBay from China. It's a shame the one in this unit didn't have something way more interesting in it. Funny you were able to get the unit for 130 pounds in the UK. US Ebay these are being listed for $14K+ good luck to the sellers.
eBay is a collection of "sellers" most of whom have no idea as to how to run a sales business.. so it's dominated by egos, belief that "surely someday someone will buy it" and other misguided ideologies haha.. very wasteful. Most of them don't value "turnover" at all. I do save substantial money for my business now and then with bulk eBay purchases, but mostly due to sellers not knowing what they have. It's very rare that I hit a "mutually beneficial" deal, where I feel that I got decent value, and the seller did as well. Kind of sad..
@@oriole8789 You can say that again. I stumbled across some interesting obsolete parts last year. The seller had hundreds of packs of these things and hadn't sold a single one. I made a reasonable offer on a couple of them. The guys response was that he couldn't afford to take a couple of dollars off the price. I just moved on with my life :)
Those Chinese noise sources are scary, they run very hot , have a pretty large output power. I would definitely wear protection before getting it on the end of my spectrum analyser
@@vincei4252 I know exactly what you mean. There's a pattern where people just dig in their heels, refuse to budge, and the items remain in their stores for years.. collecting dust, taking up space and depreciating further. If your item doesn't sell within a *year*, you should really reconsider your price. My personal patience level for sales is a few months at most. I messaged some seller to let them know that they're selling old stock items at 2-10x above full retail prices, pointed them to authorized distributors with listed online prices, and they still didn't budge. Their last response was a passive aggressive "You're such a nice person." haha. I don't even know what to make of that. ;) Gotta move on with your life, like you said!
Excellent vid with weird expensive old tech! Awesome!
It looks like the CX3000 devices are specified as dice rather than packaged devices, although CE do manufacure packaged devices. The CX3301 has 150k gates, 144kb memory and max 424 I/O (all pins count as I/O), clearly the version in that unit doesn't utilise all of the I/O as you observed on the die.
What a fantastic piece of equipment on the inside. I'd hate to troubleshoot a loose connection inside some of those boards, spaghetti central.
Are you going to do a teardown of the Kodak HG2000? that you showed on the live zoom, would be fun to see, because i got one myself! pretty impressive thing has a built in 386 processor inside it
I think he already has older videos about it, and www.electricstuff.co.uk/ektapro.html. I have known about that FPGA replacement project for a long time, but I never realized it was also MikesElectricStuff - heh! Of course it is!
@@gorak9000 That's not the camera i meant he has picked up recently i think, a Kodak HG2000, that one can record on its own, that one you linked is a Kodak Ektapro 1000 TR, thanks anyways =)
Maybe but it's not that different to the Motionscope unit I looked at a while ago, though there are some interesting details for high-G ruggedness
@@mikeselectricstuff I see, i have to check the motionscope video out, just a heads up i did something in terminal with that camera and typed 'l' and enter if i remember correctly was 2 years ago, when i did that it ereased everything from the flash memory without asking.
Luckily i had a dump of everything and could re-flash it !
data sheet spells negligible wrong at 1:25 but i guess that's negligible
06:00 I think it could be very interesting to use one of these boars fo an own project. Like to make an own spectrum analyser.
6:20, getting some inteference there
Would love you to give us a tour of your workshop
he has already done that th-cam.com/video/xDVtrxvia20/w-d-xo.html
Considering how much 'free' space there is on those custom spun chips makes you wonder if they could have condensed the BOM a bit better by better utilising the silicon space.....
There must be a reason of course that would make sense if all the facts were available. But on face value it does seem odd that they were happy to leave soo much silicon space unused all the same!
I'd suspect that they had the tooling for that die size and it worked out cheaper to just bang everything out in the same form factor rather than retooling.
they're not actually custom chips at all they're laser programmed gate arrays google chip express 1997 if you want more info
God, I love this channel.
Commenting about the disappointment about it being all digital... This thing seems to have been made about 10 years after the first digital cellphone (and network), so I don't know if it should really be a surprise the test gear wouldn't be up-to-date too.
I always wondered why all the trouble with gaskets when those wavelengths should not escape such a thin slot?
I couldn't believe my eyes. A video? Wooooooooo!
Ironic, the cellular interference around the 5:45 mark (through like 6:45 and onward) =P
Indeed, I was wondering if it was deliberate!
Do you do anything with posh socketed non-custom chips.... use them in circuits or flog 'em on E. Bay or anything?
Totally understand that when buying uncommon kit like this you are rolling the dice as to how useful it might be and if worth buying at all. Would like to know what you can/will salvage from it?
Very little if anything
Thanks for another interesting teardown! These mobile RF test units are always disappointing, there's nothing reusable in the agilent 8960 series systems either.
What is is with the the grid traces on the control board.
Good timing, I just got off ebay a couple of Alcatel-lucent WCDMA remote radio heads to take apart...
Please make more new video about some stuff like that and teardown
At firs read it as "propriapism", was shocked
Found a short datasheet for the Advanced Gate Array from Chip Express link: www.digchip.com/datasheets/download_datasheet.php?id=245082&part-number=CX3003
It's pity you destroy that noise source :( Only such diode from noisecom is for 30-100$ .
It still works :-)
Thanks for posting!!
Apple doesn't need this.
You are just holding it wrong.
Nest of coax pigtails their
nice power supply í guess when this was not a cheap bit of kit. 2x👍
What kind of things do the phone chipset manufacturers test with this? Is it the ability to discriminate those channels under the noise conditions?
How well a chipsets performs under fading and multipath conditions.
At least to check if the impulse response filter SW on L1 was working properly.
YYEEESSSSS!
I've never been this early before. :D
First 😜
Congratulations 🥇
@@awatt I haven't prepared a speech 😑