madengr

Couldn’t agree more.

For a board I just designed, I need 22 uH inductors. I ended up ordering two substitute parts, then just today was able to order the desired parts. Those substitute parts will likely be scrapped. Hell, we now order parts before the design is finished, then switch parts mid-design. The board is not ordered until all parts are in hand. It’s a massive waste.

HP 8566B spectrum analyzer and 8510C network analyzer. HP RPN calculators. Really any late 80’s and early 90’s HP test equipment. Built like tanks and designed by engineers for engineers.

Close, as the ratio of the inner and outer conductor diameters, to exactly get 50 Ohms, is an irrational number.

Resistance to tyranny is always good.

Who’s it supposed to be paid by?

Avionics are going touch too:

https://www.garmin.com/en-US/p/166058

Back when engineering software ran on Unix, exclusively, you had no choice but to use one of these. I remember the Mentor sales guy having one to demo the latest IC design software.

>Do they automatically re-tune differential pairs after you move things around?

Yes, in fact they can length re-rematch groups of differential pairs.

Altium does not have built in SI analysis, but it does have optional DC PI analysis, and likely AC in the future.

Most SI and PI are point tools anyway, so even if you use Cadence, it’s not built-in, rather requires importing into another tool.

Brother also makes machine tools and high-end sewing machines, so some of that quality mindset must flow into their consumer products.

Yep. HP, Agilent, then Keysight, which is the only good part left of the original HP.

“We have just folded space from China… Many machines in China… New machines..”.

The article mentions GaN not widely used because it is integrated with Si. Cree’s process is GaN on SiC, so you’d get better heat dissipation than in Si, but it costs more. There are also done processes integrating a diamond heat spreader under the GaN channel.

GPS uses PN codes for the timing difference measurement, as well as allowing multiple satellites on a single channel. I believe the dithering (selective availability) was turned off years ago, thus the L2 channel ads only ionospheric correction (which can also be accomplished with local sources).

The FCC symbol rate limitation needs to go. It’s a hindrance on HAM radio. Just regulate it by bandwidth, or better yet EIRP PSD, but that would be tough to control.

My kid has all 100% in several HS classes yet Canvas shows 99.99%. I tried explaining round off errors but she’ll have none of it.

The Japanese actually have a word for death by over-work:

https://en.m.wikipedia.org/wiki/Karoshi

Several black and green "belt" like accessories were found, which we hypothesize were used for sacrificial strangulation to the statistical deity.

There will be losses in the dipole conductor and resonator dielectric, so you have a finite input impedance, but that’s where the energy should go; into heat. You could use it as a dummy load over very narrow bandwidth.

RF & antenna engineer here. I’d like to know the input impedance at resonance. If you take two closely spaced, parallel dipoles and drive them out of phase, you get the same effect of nulling the far field. The issue is the impedance drops substantially.

Now take one dipole and insert a 1/2 wavelength delay (an additional resonator), and you end up with the same. So what they have done is synthesize the second dipole with the disk, so two dipoles along a common axis rather than parallel.

Dipole near fields drop off at 1/r^3, so yes, this is a method of near field coupling for power transfer or localized beating.

Diesel is more energy dense, so better to compare it to a VW TDI of 40+ MPG. You are still hauling around all that weight. I have always wanted a VW (Rabbit) pickup.

I don’t know why there are no diesel-electric trucks. If you need torque, do what trains do.

Agreed. My MSEE was invaluable, and the math in my Advanced Engineering Electromagnetics course was pretty hairy.

Yep, the Smart Things app has turned to shit. I’d also like to find some Zwave leak sensors that don’t arbitrarily trigger.

I had a Blade 2000 with dual 24” monitors and the PC card. It was a beast.

Had an IPX at that time too, stacked high with peripheral boxes. It acted as my auto-dial gateway to the internet. Of course that was connected to an HP 700 series workstation, a SGI Indigo^2, an IBM PS/2, and a Linux box. The good old days of finding surplus workstations at computer flea markets.

As a US citizen, you are less likely to be tortured in a foreign prison. This book is a good read:

https://en.m.wikipedia.org/wiki/Operation_Acid_Gambit

This article is about 18 months too late. At least I can actually buy bullets (yes, not cartridges) now, and primers were in stock at the store.

5.56 mm is down to $500/1k rounds from it’s high of $800. That is still crazy high, and I bought several 1k rounds at $270 just before pandemic as I had not seen prices that low in 13 yesrs.

How? I have seen people with 25 years service (electrical engineer) walked out with zero notice. Unless you are unionized, you can be fired on the spot.

The latter. Profitable enough to make a living from, but not profitable enough (in these days) to be purchased and sustained.

This trend is accelerating; small, one person companies founded near the beginning of personal computing are shutting down.

Others that come to mind are MicroCAP for SPICE simulation, WRCAD for IC layout.

As someone who grew up in the Cold War, it’s strange to see Russian and American aircraft used by a single military.

The tube on the cover of this book is 1 MW at 90 GHz.

https://www.amazon.com/Tube-Guys-Norman-H-Pond/dp/0981692303

It's for an airborne ADS (i.e. pain ray). Good book if you want the detailed history of microwave tubes.