I think that in some cases it had to do with whether or not you had (or could) use waveguide.? Presumably if you could/had to do waveguide, that was a "microwave".? I think at one time it included 400 Mhz, as technology advanced, it crept up to 1 Ghz, and I rather suspect it's around 2 at this time.
Just lots of guesses here.
Harvey
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On 11/6/2023 6:26 PM, Dr. David Kirkby, Kirkby Microwave Ltd wrote:
On Mon, 6 Nov 2023 at 17:14, G8HUL <g8hul@...> wrote:
They are not the same thing, but in the context of "radio
frequency" the term radio is an adjective that just defines a
certain range of frequencies, just as "audio frequency" defines a
different range of frequencies.? No confusion, they are terms that
have been in use for a century or so.
Microwave frequencies defines a sub-set of radio frequencies.
Regards
Jeff
Many people consider microwaves to be above 1 GHz. That¡¯s a sort of reasonable ¡°definition¡±. I have never seen any authoritative document that defines where microwaves start and finish.
