madengr

105 ms·

811.
by madengr 8y ago
You really don’t need to simulate it. It will just be a electrically small magnetic loop with a large real resistance. Any antenna text book should have it, with gain proportional to frequency. Of course the nonlinearity of the filament w
812.
by madengr 8y ago
I still wear them, moving them to the garage for lawn mowing shoes, and grabbing a new box. Usually buy them in sets of 3 from Amazon; size 14 in red. In the early 90’s they were $18 and made in USA. Within 1 year they went to $40 and mad
813.
by madengr 8y ago
Funny thing is, a light bulb is a decent dummy load for an antenna tuner. I rigged one up to test out an Icom AH-4 at the ham store.
814.
by madengr 8y ago
Yes, if your son is interested in RF and RADAR/Remote Sensing, they have an excellent program. No, looks like he was there before me. I did an MSEE in ‘96, under Moore and Gogineni.
815.
by madengr 8y ago
Not always. Here in KS side of Kansas City suburbs you will find crop fields between dense, multi-story developments. The agriculture land tax is applied throughout the state. The developers exploit this to pay vastly lower property tax
816.
by madengr 8y ago
Wow, 2800 pounds of Xenon, at $120/gram, is about $150M. Hope they don’t have leaks. I thought these detectors used dry cleaning fluid.
817.
by madengr 8y ago
This software is what Cadence will gladly charge you $1M/seat. Seems pretty ambitious to pull this off for free.
818.
by madengr 8y ago
I assume it will be a free upgrade to those who paid for the self-driving hardware?
819.
by madengr 8y ago
I have a program I created as a hobby, put on github, then it grew popular enough to need occasional support and updating. Sometimes I wish I did not put it out there. It can quickly become work instead of fun; work you are not paid for.
820.
by madengr 8y ago
When you bring an antenna close to a conductor, say a dipole next to a plate, the radiation resistance decreases. This is due to the currents induced in the plate, creating an image and reinforcing the currents in the dipole. It’s really t
821.
by madengr 8y ago
This was the machine though, not the grinder. Probably 10 years ago too. She just uses a Nespresso machine now.
822.
by madengr 8y ago
Had a Breville expresso machine I repaired multiple times for my wife. The pump was decent, but the electronics were complete garbage for a $500 machine. The main problem were unsealed switches in a humid environment.
823.
by madengr 8y ago
Think of it like this: The wavefront around a dipole is comprised of near and far fields, with the near field being spherical and the far field planar. That near field has a reactive component (stored energy) that does not propagate, but f
824.
by madengr 8y ago
I had Stuzman and Theile in antenna class, but Balanis for grad level EM.
825.
by madengr 8y ago
Resonant antennas are only one class of antennas, with the other being traveling wave antennas. A log periodic looks similar to a Yagi, but it’s not. Same with a biconical and dipole. It’s an easy day when I have dimensions on the order o
826.
by madengr 8y ago
FWIW the Kansas Cosmosphere supposedly has the most extensive Soviet space collection outside of Russia. So if you are driving across on I-70, it’s definitely worth a diversion. The rumor is the stuff was on tour in the USA in the 90’s wit
827.
by madengr 8y ago
The strangest one claimed to displace a pith ball, 50 meters away through several walls. They had some sputter deposited, superconducting sphere they were pulsing with current.
828.
by madengr 8y ago
- Gravity manipulation There were a few reports in the ‘90s of this, all involving superconductors.
829.
by madengr 8y ago
“it could hasten your termination” Yes, that’s part of the happiness; me not giving a shit. An employers ideal engineer is someone young with kids and a fat mortgage. A financially independent graybeard with loads of institutional and doma
830.
by madengr 8y ago
I think it’s being old enough, to be financially independent enough, to not take shit from anyone. 47 and paid off mortgage this week. Zero debt and have 1 kids college saved up in cash, and low 7 figure retirement savings. Still need a jo
831.
by madengr 8y ago
Tornados cut a narrow swath, compared to a hurricane. I’d wager all the tornados in the last 100 years cause less total economic damage than a single hurricane hitting a coastal city.
832.
by madengr 8y ago
Yep, mostly done by graybeards, which Intel probably fired.
833.
by madengr 8y ago
Wow, I’m paying $130 for 100/5. Damn cable companies.
834.
by madengr 8y ago
Soviet bloc housing; no thanks. That is the end result of government policy.
835.
by madengr 8y ago
Though you can do the same current limiting with a pulse width modulated switch (similar to a switching power supply). My point being you can take a resistive element and replace it with a switched transistor. All ideally of course, since
836.
by madengr 8y ago
Someone asked me once if the resistor was really needed as a circuit element. I postulated that it was not desired, nor needed for any circuit that didn’t intend to waste energy.
837.
by madengr 8y ago
Spending 90% of the money or time, on the last 10% of performance, is common in my experience. The ratio may be not that extreme, but that’s the crux of it.
838.
by madengr 8y ago
Interesting that Switzerland has $57k per capita income vs $54k in the USA, but the model 3 is probably 2x the cost of the US best selling car. I assume the variance in Switzerland income is allot smaller than the US, thus more residents ca
839.
by madengr 8y ago
No, it’s like buying an 1 GHz oscilloscope and buying the license to enable the 2 GHz version. The hardware has always been there. The test equipment industry is notorious for this. I can buy a $15k Keysight Fieldfox spectrum analyzer and
840.
by madengr 8y ago
The iPhone XX will be welded shut. Now you’ll never be able to change the battery.

More ›