The difference is "amplitude modulation" and "frequency modulation". In the 1st one--1927, the signal wave is changed. In the 2nd one--1945, the number of times it is changed is multiplied. More info can be found here; https://www.google.com/search?q=difference+in+radio+from+1927+and+1945&rlz=1C1GCEA_enUS743US743&oq=difference+in+radio+from+1927+and+1945&aqs=chrome..69i57.23400j1j7&sourceid=chrome&ie=UTF-8
Radio help
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AM vs FM....
https://www.google.com/search?rlz=1C1GCEA_enUS743US743&ei=mXfXWvmEN6Kxggeq1Yq4AQ&q=am+vs+fm+radio&oq=am+vs+f&gs_l=psy-ab.1.0.0i67k1j0l2j0i67k1j0l6.50708.54961.0.57263.45.16.0.1.1.0.417.2051.0j10j4-1.12.0....0...1c.1.64.psy-ab..36.8.1419.0..33i160k1j0i131k1j0i131i67k1j0i10k1.247.khnsuCDsoO8
AM----Lawrence Welk. FM---Steely Dan.
Oh no!
Its down the rabbit hole again.
AM = Amplitude Modulation - the amplitude of the carrier is varied in accordance with the amplitude variations of the modulating signal (voice, music, digital data, etc)
FM = Frequency Modulation - the frequency of the carrier is varied.....etc.,
PM = Phase Modulation - the phase of the carrier is varied.....etc.
AM was the first, earliest modulation used for radio communications systems, next came FM, then PM.
Phase Modulation (specifically, PSK and QAM) is the primary modulation format used almost exclusively for modern digital communications (think cell phones, satellite communications, terrestrial microwave communications, to name a few).....
https://en.wikipedia.org/wiki/Modulation
RussBell wrote:
alleenkatze wrote:
minichess wrote:
I'll have to update my article on radio and wireless chess and fix all the confusing terms or define them better. I also wrote on telegraphs and cable matches. An interesting time before the Internet.
- Bill Wall
I think your articles are accurate in using the terms telegraph, cable and radio, but a distinction between radiotelegraphy or radiotelephony might be needed. Thanks.
Radiotelegraphy refers to the transmission of Morse code signals via radio (wireless). Radiotelephony refers to voice (audio) signals via radio. These are now essentially archaic terms, rarely used today, referring to signal transmission technologies of the distant past. For example, the Morse format for signal transmission is now virtually defunct for modern communications, having been superseded by more complex signal coding techniques and transmission technologies.
Not the point here. In the context related to the chess references the terminology is appropriate. Regardless of how “archaic” in relation to today’s technology.
... Bill Wall amassed a collection of radio inspired chess facts here: http://billwall.phpwebhosting.com/articles/radio.htm
Note he mentions:
"In May 1927, a 12,000 mile wireless radio match was played between the London House of Commons and the Australian Parliamentarians in Canberra, Australia."
And a few lines later he states, "In 1945, the first International Radio Chess Match was held."
Wouldn't the first international radio match have been in 1927 or was there some difference in radios between 1927 and 1945? ...
Is this now resolved?