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  1. R

    Modern usage of non-navigational radio beacons

    Interesting; so you're suggesting that propagation models, across all or almost all bands and propagation modes, are well-established, and with the combination of a pinging function, beacons aren't needed anymore, at least for propagation (which leaves just for testing)?
  2. R

    Modern usage of non-navigational radio beacons

    I see, makes sense---what stimulated my question is my idea of setting up an X band beacon to gain experience, before I undertake the RF work of my microwave METI project (my C band amplification array is capable of approximately 15 kW at flange, but US amateur radio regs limit it at a mere 1.5...
  3. R

    Modern usage of non-navigational radio beacons

    Well, with regards to amateur radio, you are both sort of right; n.b. it's important to avoid conflating the amateur radio service, and its userbase. This service is essentially an international regulatory conduit for individual and nonprofit radio communications, allowing all sorts of...
  4. R

    Modern usage of non-navigational radio beacons

    How useful are non-navigational radio beacons (i.e., for determining current propagation conditions and testing) nowadays, whether microwave X band, HF, ELF, sub-mm wave, etc., considering the advent of computerized propagation modeling? Is the scarcity of non-amateur radio beacons a result of...
  5. R

    Fiber-Optic Delay Line Loopback Data Storage

    How much data could be theoretically and realistically stored in a hypothetical system consisting of a delay line loopback in the form of a long looped fiber optic cable?
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    Retaining Ring Removal

    This is more of a practical question - what is the proper way to remove the retaining ring shown below? Note that it does not contain lug holes, so I am not sure whether retaining/snap-ring or circlip pliers would be capable of removing the ring.
  7. R

    Dover Calculus Books

    What about books on differential equations? I was thinking of: Partial Differential Equations for Scientists and Engineers (Farlow) Ordinary Differential Equations (Tenenbaum)
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    Dover Calculus Books

    Any recommendations on which Dover calculus books I should acquire that are past the typical "Calculus II" curriculum? Some of them appear to overlap significantly. I have considered the following books: Advanced Calculus of Several Variables (Edwards) Advanced Calculus: Second Edition...
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    Solid-State Electronics

    Not just traditional "vacuum tubes" but also incandescent lightbulbs (vs. LEDs), GM tubes (vs. semiconductor detectors), scan converter tubes (vs. high-speed semiconductor ADCs), mechanical cooling devices (vs. Peltier cooling devices), etc.
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    Solid-State Electronics

    I have wondered, why do non - solid-state electronics typically precede solid-state in the history of development? The two main reasons that I have thought of are limited knowledge of physical phenomena, and limitations in other technology used to construct the device (e.g., involving small...
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