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  1. MalcolmStewart

    lithium batteries

    Unfortunately, our problem was adding a then modern requirement, fault reporting, to a system originally designed in the 70s well before flash memory came on the scene. And the user also came up with the requirement that faults had to be readable up to 2 weeks after the plane had landed. If...
  2. MalcolmStewart

    lithium batteries

    I was responsible for safety on a large airborne radar system some time ago. For fault reporting memory backup, it utilised a bank of quite large rechargeable lithium batteries, in a series/parallel configuration. At the time, lithium batteries were known to be somewhat risky, and we went to...
  3. MalcolmStewart

    Prism constant for Nikon mini-prism in corner

    I'm new here, and a retired avionics / radar engineer with an interest in surveying archaeological sites such as stone circles in Wales. In the past I've used a Wild T2 theodolite with a Disto Basic mounted above and parallel to its telescope, and measuring angles and ranges to a custom...

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