Recent content by rnabioullin

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)?

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...

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...

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...

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?

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.

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

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...

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.

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...