Class D

Harry,

It is extraordinary that I came up with the cartoon about "the club", "the code of omerta of the academic mafia", and did not really see the truths underlying it until you, Harry, replied that it was funny, which it is not.

This is true culture clash. I first have to try to define MICE; mathematicians, instrumentalists, careerists, the EMC gang. They control STEM. They are holding the sine wave fort against the digital age. Up to 1965, they controlled electromagnetic theory against the rising, crude tide of - not just the simple, unmathematical pulse. Something much simpler; the step. (When your computer tells your printer to print, with a single transition from perhaps 0v to +3v.)

I actually designed a three bit counter with three thermionic valves; very expensive devices merely to count up to three, used as class D.. That was just before the transistor, which a few years later was also very expensive at £3 - the equivalent of £100 today. (My salary was less than £1,000 p.a.)

I remember the horror that early MICE felt when these upstart, crude digital men (with me among them) used a sophisticated, expensive amplifying (class A) device as a mere, highly expensive unmathematical switch.

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Notice that the Wikipedia Thought Police still control the Wik entry on "Power Amplifier Classes". Perhaps it is the same Wik man Burks who controls the Wik entries on both "Ivor Catt" and "Displacement Current". In "Ivor Catt", Wik's Chris Burks (Chetvorno) has removed all discussion of Ivor Catt's work on electromagnetic theory from the Wik "Catt" home page, but left 20pp on it in "Talk". https://en.wikipedia.org/wiki/Power_amplifier_classes#Class_D

"In the class-D amplifier the active devices (transistors) function as electronic switches instead of linear gain devices; they are either on or off."

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Then, the horror was at using a highly mathematical sine wave amplifier as a mere switch. Today, Howie's horror is at replacing a highly mathematical sine wave down a transmission line with an unmathematical single step. He uses Fourier to justify the suppression of discussion of the simple step, and even his suppression of the thought from his brain. – Ivor Catt 24.8.2020

(Hopefully to be continued).

Today’s digital men are very familiar with a digital signal going down a transmission line with varying Zo. At every change in Zo, there are reflections. It is a complex business which Howie is not familiar with. He can only consider a different, also complex situation of a high frequency sine wave going down a lossy transmission line. Digital men can ignore losses, which are minimal, and do not affect their work in the way they affect microwave men. Standing sine wave men ignore changes of Zo, which exercise digital men.

A digital man can envisage a standing wave reciprocating down a lossy cable with variable Zo without losses. A sine wave man cannot. He can only think of a reciprocating sine wave, which is much more complex. He cannot imagine that all the changes in Zo might still lead to a reciprocating ExH having no losses in a lossy transmission line. The previous sentence is crucial.