madengr

58 ms·

241.
by madengr 6y ago
They are using public right-of-ways an spectrum to carry their data, so free speech ought to apply.
242.
by madengr 6y ago
I built a radar jammer, when in college, back in the 90’s. The issue is you end up setting off other people’s radar detectors, which just slows down traffic. Most police traffic is on a trunked radio system shared with other users, and is
243.
by madengr 6y ago
The US doesn’t have a lot of red light cameras. The ones that they do have are usually privately owned and administered. The owners puts them in for free and gets a cut of the fines. Now that’s American.
244.
by madengr 6y ago
What’s ln(2)/3 used for? Back in EE school in 1991, I installed an 8087 in my PC. The speed-up running Micro-CAP 3 was amazing, as a simple BJT CE amp sim only took a few minutes. Of course then I moved to a 486 and that same sim was
245.
by madengr 6y ago
Huawei is screwed for RF front end components, specifically integrated PA, switching, and BAW filtering. I don’t believe there is a domestic supplier of those.
246.
by madengr 6y ago
They probably all use the software. Funny thing is that TSMC +10 nm is subject to these rules, but not the 7 nm as it uses under 13% USA technology. Yes, I think ASML will not sell them equipment.
247.
by madengr 6y ago
Did anyone notice that PCB? 50 pounds, 30k components, 1M drill holes, and 1 km of traces. Pretty much blew my mind.
248.
by madengr 6y ago
I bought one of those too. Probably finish up the build this weekend.
249.
by madengr 6y ago
A few pics of my Altair mini build here. The kits seems no longer available. https://rfpoweramp.com/
250.
by madengr 6y ago
I'm sure evaporative cooling is cheaper too, compared to some place where it's too humid.
251.
by madengr 6y ago
My old boss worked on the Apollo mission comms, specifically the large dish antennas on the ship. It was just his way of joking about large numbers. 10 dB (deci-Bells) is an order of magnitude ratio; 10 dB = 10 Log(10). For non ratios you
252.
by madengr 6y ago
Wow, that was a memory jog. I remember watching that in my dorm room on my 486, downloaded from some BBS. https://youtu.be/VjYQeMExIwk
253.
by madengr 6y ago
My old boss always said "There isn't 200 dB in the entire universe". Of course if you compare the diameter of the universe to a quark, it's 10,453 dBmeters, so I guess there is.
254.
by madengr 6y ago
I always thought it was Transient ElectroMagnetic ProteEction STandard. Wikipedia says: TEMPEST (Telecommunications Electronics Materials Protected from Emanating Spurious Transmissions) This says it is "Telecommunications and Electric
255.
by madengr 6y ago
So why was the Altair front panel grouped into octal, but the Imsai in hex? I find octal totally confusing.
256.
by madengr 6y ago
Maybe after this guy landed a plane there: https://en.m.wikipedia.org/wiki/Mathias_Rust
257.
by madengr 6y ago
What do they mean by rallying? The S&P is down 10% from the start of all this crap. My 401k is down a little more than that. Sure, it’s higher than 1 month ago, but may take 2 years to recover.
258.
by madengr 6y ago
There has got to be some alternative to YouTube. First it was gun videos, then “hate speech”, then medical videos or anything that doesn’t tow their line with the virus, and now they are screwing with people (the Peak Prosperity guy) discu
259.
by madengr 6y ago
In theory, yes, but practice no. The antenna required to collimate the beam from LEO, down to a person sized spot on earth, would be massive. Single antenna apertures are limited to about 90 dB of gain, and I doubt that is near enough, but
260.
by madengr 6y ago
There is evidence pointing to cleavage: https://youtu.be/R6y8dlhoMpo
261.
by madengr 6y ago
Interesting. Several years ago I designed a resonate, near field wireless charging platform and used a simple X5R capacitor; the nonlinearity of the X5R dielectric to provide regulation. As the distance increased, the resonant frequency a
262.
by madengr 6y ago
Supplying the power to the satellite, and getting the heat out. The RF amps are at most 50 % efficient, so you are dissipating 1/2 the input power as heat.
263.
by madengr 6y ago
5G is a very broad term, which is supposed to offer 10x performance in all metrics over 4G. This seems to be the same issue when they were called Light Squared. The L-band was to be used for terrestrial base stations with very high power t
264.
by madengr 6y ago
Probably less noisy than a car engine with traditional ignition coil. Not to mention all the PCs with glass cases.
265.
by madengr 6y ago
Well at this point it needs to be spread at a rate that keeps the hospitals filled (at say 80% capacity). So it’s probably good that you have people disregarding the lockdown, because at the present rate, it may take a really long time to
266.
by madengr 6y ago
Well I take “growth” to be a “rate” (the velocity). So a “growth rate” would be acceleration. That death curve is now flat for the last two samples, implying the rate is zero. The graph should be labeled deaths/million/day, whic
267.
by madengr 6y ago
I have his CD of Bach cello suites. Have you tried Idagio?
268.
by madengr 6y ago
I’ve never heard of the big vendors charging universities. They usually bend over backwards to get their software installed. Have you tried CST? https://www.3ds.com/products-services/simulia/products/cst-s...
269.
by madengr 6y ago
Ugh, no. I have been using RF CAD since HP MDS. You’ll end up with a convoluted mess like ADS, where the EM package is now a separate application from the main package. I ditched it 20 years ago; good riddance. The Microwave Office guys
270.
by madengr 6y ago
You’ll never get those add-ons in a free package, as it takes institutional knowledge and full-time work to develop it, which cost $$. Cadence, Keysight, etc. provide the licenses to universities, not individual students, but they are prett

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