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  1. searsjames

    Fastest Counter around?

    I am starting to answer my own question. The fastest counters seem to be in FPGAs from Xilina, AMD, and Actel. SO far I have seen referance of up to 400 MHz.
  2. searsjames

    Fastest Counter around?

    I have a question along these lines. Are there binary counter chips that work up to 250 MHz. If not what is the fasest logic family that actually includes either toggeling flip-flops or counters?
  3. searsjames

    Ranging using radio

    Oh my goodness, PRS encoding relies on Shannon theory and everything else acording to Google. I think I have to hit the hay at that. Im going to get back to this tommorow. Thank you guys for your help.
  4. searsjames

    Ranging using radio

    I plan to send a time calibration signal to each receiver about once per second and oven stabilization of their clocks will be used if needed. I am only ranging up to 500 meters so weather is less of a problem and yes I will have fixed, known position transmitters to perform periodic range...
  5. searsjames

    Ranging using radio

    One of my constraints is that I will have hundreds of transmitters to track from each pod of three recievers. Each transmitter needs to cost <$10 @50K quantity and so will only send its ID # and a few more bits. The recievers can cost several hundres dollars or more and can be constantly time...
  6. searsjames

    Ranging using radio

    First I am confined to a plane and so 3 receivers work. The relative time of reception at these 3 receivers is all i need. The first problem is the detection circuit for triggering a 4 ns resolution time tag repeatably after the 433 MHz hits each receiver. The second problem is the counters...
  7. searsjames

    Ranging using radio

    I have a very similar problem. I need to distance range using 3 recievers in a fixed grid and a 433 MHz pulse transmitter moving around. The objective is for the recievers to each time stamp their reception of the transmitter pulse to within a repeatability of 4 nanoseconds. Accuracy will be...

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