madengr

69 ms·

331.
by madengr 7y ago
Reminds me of the Southpark episode with Cartman in the moonsuit.
332.
by madengr 7y ago
They have no idea. A grocery store worker is essential, until the freezer craps out, at which time a HVAC repairman is essential, who needs a part delivered via FedEX, who needs a functioning airport, etc. There are too many micro-essenti
333.
by madengr 7y ago
Not much. The F-117 is stealth mostly due to shape. The B2 stealth is mostly due to materials and construction techniques. You can run optimization routines to reduce scattering, but it’s not going to be huge improvements This is a good
334.
by madengr 7y ago
Well I guess allergy season has nothing to do with that coughing and sneezing.
335.
by madengr 7y ago
Won't do what?
336.
by madengr 7y ago
The Synapse mesh radios pretty much do this, seamlessly linking RF meshes with an IP bridge. https://developer.synapse-wireless.com/modules/index.html
337.
by madengr 7y ago
This is all assuming they use antennas that are optimized for the application. If they use a “chip” antenna, performance will suck.
338.
by madengr 7y ago
Yep, stands in their way of implementing socialism. Of course, AFTER they get any inheritance.
339.
by madengr 7y ago
Yes, and I assume they cut a check to your IRA?
340.
by madengr 7y ago
No, $300k. She was locked out for 2 weeks as it was liquidated and a check cut to her IRA. Fortunately there was no volatility then. My employer changed the 401k match (in company stock) to a single purchase in January. Of course you can
341.
by madengr 7y ago
Well you can be fucked by your employers 401k manager. The day my wife quit, she was locked out of here 401k for 2 weeks. They divest everything during that term, and you have no control over the timing. She quit near market peak last ye
342.
by madengr 7y ago
Got a link to the report?
343.
by madengr 7y ago
I doubt they have missed out on anything, except riddling their software with bugs. I’m just glad that my engineering software just plain works. The people who write those applications typically come from an engineering background, and th
344.
by madengr 7y ago
Yes. Each PA probably has no more that 10 mW (assuming CMOS), but coherently added will yield over 100 mW EIRP. For RX the signal coherently adds, but the LNA for each channel has uncorrelated noise, so the RX SNR is not as good as a pass
345.
by madengr 7y ago
My company still builds core memory for a military flight computer. It’s cheaper than re-qualifying a new computer.
346.
by madengr 7y ago
The block diagram didn’t show a switch, and the NF is 6 dB, so I figured it was separate. I have used the HMC-6301, which has about the same NF. The switches get quite lossy at mmWave.
347.
by madengr 7y ago
No, it's active. Assuming they are using their 16 channel chip: https://perasotech.com/x-series-products/ I'll bet it's two, 32 element arrays (one each TX and RX) composed of 2-element sub arrays.
348.
by madengr 7y ago
I'm betting the front-end chip is all CMOS, as opposed to SiGe, so it will be quite cheap (under $10 in volume). 16 TX elements at a total of 20 dBm transmit power is 8 dBm/element, which is feasible in CMOS. State of the art in
349.
by madengr 7y ago
The antenna is built on a separate substrate, I'm guessing a spread glass such as Rogers RO1200. You can do the aperture calculation here, which for a square aperture at 100% efficiency is 18x18 mm. It's probably more like 75% e
350.
by madengr 7y ago
Here is the actual paper: https://www.honeywell.com/content/dam/honeywell/files/Beta_1... This is all very interesting. I work for another division of Honeywell (not this quantum group) and about 4 year
351.
by madengr 7y ago
“ Mr. Kim owns his place in the building, bought for $30,000 after he sold his house in a better neighborhood 20 years ago to help pay for his late wife’s cancer bills.” How does that fit into universal health care?
352.
by madengr 7y ago
This was publicly known over 25 years ago. There was a 60 Minutes piece in it in the early 90’s. Why are they up in arms about it now?
353.
by madengr 7y ago
There is no gouging going on. You’d be lucky not to loose money with all the headaches of doing space and military stuff. I can tell you the last space stuff I worked on, we were the third contractor to work on it, as the 1st and 2nd said
354.
by madengr 7y ago
Yes, and I guarantee no one is getting rich. Been there, done that.
355.
by madengr 7y ago
Yep. Tons of documentation and paperwork trail too. We had some silver epoxy slowly degrade (loose conductivity) over 3 years. It was used to put down some thin film RF attenuators, thus the ground lifted and attenuation was lost (slight
356.
by madengr 7y ago
The space qualified transistors are: Hermetic ceramic and copper tungsten packages. Eutectic die attach. Hand wired bonded. X-rayed for voiding under die. Gettered to absorb hydrogen. High temperature lid soldering in helium atmosphere. Le
357.
by madengr 7y ago
I have built several X-band transmitters, both ground and space qualified. The space qualified GaAs FETs in the latter were $7k each.
358.
by madengr 7y ago
Regardless of the virus, now is the cheapest I have seen ammo in 15 years. Ammoman has 1k rounds of brass 5.56 for $289 shipped. I’d stock up before the election run. https://www.ammoman.com/
359.
by madengr 7y ago
Think there is an illegal immigration problem in CA now? Wait until UBI.
360.
by madengr 7y ago
My wife is doing the GT MS in data science (career change after after 20 years in microelectronics process engineering). Yeah, for under $10k it is definitely a good deal. I do think there will be a glut in this field as everyone rushes in

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