olTechie

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olTechie

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  • 10.31.2017
  • Connectivity options for the IoT
  • 5G would be completely useless for autonomous vehicles. It is in the high microwave to mm wave range, short distance and requiring direct line-of-sight to the towers. A moving vehicle would have to constantly drop and re-acquire connections, with probably disastrous consequences. And it would only sort of barely work in extremely densely populated urban environments. Leave the city and it would instantly fall back to 4G. So why 5G for IOT? are our "things" going to be streaming 4k video for some reason? Why does a toaster or a light bulb need 4k video? NB-IOT and LTE CAT M etc. make a lot more sense for IOT. Fortunately there is no current plan to replace 4G with 5G. It will be a high bandwidth option in population dense areas where it makes sense. At least that is what Verizon representatives told me when I asked at the trade show. Despite the 5G caveat, the article is a great overview of available IOT wireless options.
  • 06.22.2000
  • Novel method detects lock in Costas loops
  • Double oops, spoke too soon again, the article is under the "PDF Version" link but is a page down in the text. All the figures are there, looks like a sincerely strange idea (injecting noise to disturb the loop so you can detect lock more precisely). But it gave me a new tangent to try, thanks for the article.
  • 06.22.2000
  • Novel method detects lock in Costas loops
  • Oops, spoke too soon, the "PDF Version" button links to another article. The figure links to this article show as PDF but Adobe can't read them. They are actually html code with a PDF suffix but none of the links in the html work. Looks like this one is lost forever, too bad. I could have used the hardware as pseudocode for my software Costas loop implementation.
  • 09.24.2015
  • USB oscilloscope by and for makers
  • I 'carefully' use my PicoScope 3206MSO every day. While the lack of real knobs is sometimes an annoyance, I can easily analyze serial bitstreams or complex waveforms on a 22 inch screen. I can zoom in on a stored wave, I can store many different versions of a measurement directly to my cloud drive for analysis on other bigger machines, I can save a serial capture as a text file or spreadsheet. Practically no limit on "capture depth". Every time I price out a Tek or even an Owon with the same specs (got to be at least 200 MHz) it comes out twice what I paid for the PicoScope or more. My unit has arbitrary waveform generator, persistent shaded color screen for eye pattern etc., spectrum analyzer, 16 input logic analyzer, decent bandwidth, auto setup, complex trigger, serial analyzer that can do SPI I2C etc. not just RS232, just about everything you get with $1000s in add-on fees with other scopes. No need for batteries, it is powered by the little cheap two-in-one tablet that I use for it. An android phone or tablet would be really annoying to use, the USB and the HDMI are usually on the same port which makes it hard to connect to a big screen. And you really need a keyboard too, trying to navigate by gestures that get misinterpreted half the time on a tiny screen would get old really fast. If you need isolated operation you just unplug the screen and charger. One of these days I'll put stickers on the hot keys on the keyboard and I'll even have dedicated buttons to hit. Maybe not as good as a trigger knob you can grab and twist but pretty close. One thing that would be nicer with the more expensive units would be better vertical sensitivity, and when you have a lot of measurements set it is slow between traces. That almost never becomes a problem with the work I do, and the ability to easily transfer files around far outweighs the disadvantages.