In message
<90cb2e2117c14d10b8f8804eeb696...@bl2pr03mb372.namprd03.prod.outlook.com>
, dated Wed, 27 Aug 2014, Ted Eckert <[email protected]> writes:
If my understanding of history is correct, we may even have the
existence of the 2.4 GHz ISM band due to radiated emissions from
microwave ovens. They operate at 2.4 GHz, and the early versions were a
bit leaky. I've heard that this frequency was so polluted with noise in
residential environments that it wasn't adopted by anybody for a
specific purpose leaving it open to ISM applications.
Microwave ovens are classified as ISM, because the definition of ISM
really has nothing to do with 'industrial scientific and medical' but a
great deal to do with 'the intentional use of radio-frequency energy'.
Another case of failure to predict the future; when 'ISM' was invented,
no-one thought that a 1 kW 2.4 GHz (potential) transmitter would be in
nearly every home.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Quid faciamus nisi sit?
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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