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From: on Tues, Oct 3 2006 3:25 pm
wrote: From: Nada Tapu on Sat, Sep 30 2006 2:23 pm On Fri, 29 Sep 2006 20:56:08 -0400, wrote: Manual radiotelegraphy was a MUST to use early radio as a communications medium. The technology of early radio was primitive, simple, and not yet developed. On-off keying was the ONLY practical way to make it possible to communicate. Yet some pioneers (like Reginald Fessenden) were using voice communication as early as 1900, and had practical lomg-distance radiotelephony by 1906. "PRACTICAL?!?" What is "PRACTICAL" about inserting a single carbon microphone in series with the antenna lead-in to 'brute force' modulate a CW carrier?!? You have never 'ridden gain' in broadcasting at an audio control board to make "PRACTICAL" audio broadcasting, yet you DEFINE "practicality" in such things as inserting a single carbon microphone in series with the antenna for broadcasting. For a double-degreed education in things electrical you just displayed a surprising amount of ILL logic and definite misunderstanding of the real definition of "practical." AM broadcasting was a reality by 1920. Superfluous minutae. YOU have NEVER been IN broadcasting. Your amateur radio license does NOT permit broadcasting. I have been IN broadcasting, still have the license (now lifetime). NO, repeat NO amplitude-modulation broadcaster uses your so-called "practical" means of modulating a CW carrier. NONE. Had Fessenden's EXPERIMENT been at all practical, others would have used that technique. NONE did. Morse code was then already mature and a new branch of communications was open to use by downsized landline telegraphers. While some radio operators came from the ranks of landline telegraph operators, most did not, as it was predominantly young men who pioneered radio in the early part of the 20th century. PR bull**** you fantasize. You were NOT among the "pioneers of radio" and you have NO demographics to prove the ages, let alone a poll or listing showing that. All you have is some bowdlerized, very edited versions of radio history from the ARRL. Here's a plain and simple fact: Landline telegraphy was already changing from manual to teleprinter by the year 1900. That changeover continued until the middle of the 1900s until ALL the landline telegraph circuits were either shut down or replaced by electromechanical teleprinters. The Morse Code used on landlines was "American" Morse, while that used on radio after 1906 was predominantly "International" or "Continental" Morse. Superfluous minutae. Manual telegraphy consisted of closing and opening a circuit. That has never changed. There are dozens, if not hundreds, of different versions of on-off telegraphy which have been developed, NONE of them modeled on either "International" or "Continental" AMERICAN morse code or any English-language representation. |
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