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The article says that what Idzerda invented is narrowband FM, while Armstrong invented wide band FM. Even if true that is a distinction without a difference -- FM is FM, the deviation used is a parameter that can be chosen fairly arbitrarily. In any case, it's not even accurate; the early Armstrong patents speak of "100 percent" modulation with an explanation that translates to a modulation index near 1, which is very definitely narrowband FM. A more accurate description of the two would be that (a) Idzerda's work has been forgotten while Armstrong's became well known and directly led to the current practice, and (b) Armstrong also developed receiver technology that takes advantage of the noise immunity potential of FM, while Idzerda adopted FM for other reasons (efficiency and simplicity of the transmitter) and did not mention or was not aware of the capture effect. Paul Koning (talk) 18:38, 20 December 2017 (UTC)[reply]
