madengr

61 ms·

1. 301.▲
   by madengr 7y ago

   http://forum.arcadecontrols.com/
2. 302.▲
   by madengr 7y ago

   At least they can blame the Coronavirus (which they did). I think you’ll see a ton of insolvent companies doing this. If you want an Atari, buy a real console. Better yet, build a MAME cabinet. You can run all the 2600-7800 games in ther
3. 303.▲
   by madengr 7y ago

   Ha ha, way over my head. I had one modern physics course; a little special relativity but mostly quantum behavior. If you mean a perfect, isotopic antenna; I don’t believe it exists. Though I suppose it could, if you consider an antenna pa
4. 304.▲
   by madengr 7y ago

   I suppose parametric amplifiers would be similar in the RF realm. At least we have distributed amplifiers, which I suppose could be an amplifying medium if you could make them fine enough.
5. 305.▲
   by madengr 7y ago

   Case in point is my ham radio station. I have an active magnetic loop for HF RX. This allows me to null out near field interference (a few dB from the transformer in the back yard) and provides very broad bandwidth (VLF thru HF). It is 75
6. 306.▲
   by madengr 7y ago

   In a nutshell: If you have to guide an EM wave without dispersion (e.g. TEM propagation), it takes at least two conductors; those have loss. The smaller they get (think a thin coax) the more lossy they become. If you need a wide bandwidth,
7. 307.▲
   by madengr 7y ago

   Well it amplifies the signal by the Q of the antenna. The issue is that high Q resonators make lousy radiators, as the radiation resistance is very low compared to the reactance, and bandwidth is 1/Q. But you can certainly get amplif
8. 308.▲
   by madengr 7y ago

   Ha ha, well I take issue with the “simply” part. There are several expensive, EM field solvers. If it were simply, they would be cheap.
9. 309.▲
   by madengr 7y ago

   Need to think about charge displacement and fields rather than electrons. The electrons moving in wire (direct current) circuit only move, on average, a few cm/sec. Now the charge displacement moves at the speed of light. Think of a
10. 310.▲
    by madengr 7y ago

    You actually can overlap RX and TX bandwidth on coax, though you need magic-tees and very good impedance matching in either end, and of course constant impedance cable. That limits it to about 100 Mbps, but you can buy the (magnetic) magic
11. 311.▲
    by madengr 7y ago

    You mean the gal in the bikini right above the diagram of a dipole?
12. 312.▲
    by madengr 7y ago

    This is a good intro on MIMO. The spatial multiplexing was first used in the 50’s in microwave towers using quadrature splitters: https://www.microwaves101.com/encyclopedias/mimo-an-historic...
13. 313.▲
    by madengr 7y ago

    Yep. The killer for the AD9364 is the 5th harmonic of the 2m amateur band falling on this nation-wide (USA) LTE signal. That damn LTE seems to be everywhere, and it’s strong.
14. 314.▲
    by madengr 7y ago

    I’d go for the widest real-time BW and best phase noise (clock jitter), as there are things you can do with offset tuning, low IF, and decimation to get around some of the spurs and dynamic range limitations that are inherent in these direc
15. 315.▲
    by madengr 7y ago

    Or Flex Radio for the high end; https://www.flexradio.com/
16. 316.▲
    by madengr 7y ago

    Until the banks foreclose on the rental property and evict them anyway.
17. 317.▲
    by madengr 7y ago

    The only thing the Defense Production Act is going to help, is placing the federal government at the front of the queue. You can’t spin up a factory that makes X into one that makes Y without months or years of retooling. By the time more
18. 318.▲
    by madengr 7y ago

    Well I guess this sort of stuff happens when you outsource manufacturing for a generation.
19. 319.▲
    by madengr 7y ago

    Well they say it’s not transmissible via the digestive track, but my family is doing the same.
20. 320.▲
    by madengr 7y ago

    The anti-microbial effect of copper has been known for decades, which is why it fathoms next that fixtures in hospitals are still made from steel.
21. 321.▲
    by madengr 7y ago

    There were some studies a few years ago that claimed lead free was actually worse for the environment due to a much higher joint failure, resulting in more disposal of electronics.
22. 322.▲
    by madengr 7y ago

    Copy machines were too expensive to use for school work. I remember some machine that used a hand powered roller to spit out copies in a pale, blue ink. This was late 70’s/80’s.
23. 323.▲
    by madengr 7y ago

    Well I hope he is right.
24. 324.▲
    by madengr 7y ago

    So Cumo wants all 20,000 ventilators for NYC, and I suppose the rest of the country can just fuck-off? Considering NYC has about 8M population, that 400 is just about the proper allocation.
25. 325.▲
    by madengr 7y ago

    Isn’t MACOMs process GaN on Si, which is cheaper, but lousy thermal performance compared to GaN on SiC. I thought they were touting GaN integration with CMOS?
26. 326.▲
    by madengr 7y ago

    I have not been in a grocery store since the SHTF, but I’d be particularly concerned about the produce isle, specifically leafy vegetables.
27. 327.▲
    by madengr 7y ago

    Likely you can see certain sections of the code if you sign an NDA. I have done this before for the CAD software I use.
28. 328.▲
    by madengr 7y ago

    So what did they actually pass? The article is short on details.
29. 329.▲
    by madengr 7y ago

    Killed 20 million too in the great revolution.
30. 330.▲
    by madengr 7y ago

    Many will turn right around and spend it on drugs.