Why 2.4GHz? Chasing wireless history
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Why 2.4GHz? Chasing wireless history
1–10 of 57 posts
Re: Why 2.4GHz? Chasing wireless history
#2Well, to be precise, it's 2.4GHz and 902-928MHz, so, for completeness, you'll want to chase down both of them. (I spend a lot of time on 902-928 MHz at 1 Watt. )
Re: Why 2.4GHz? Chasing wireless history
#3I would say that a lot of the rationale would come from:
1) Availability of the 2.4GHz band in other established countries 2) Propagation characteristics of 2.4GHz (this would also explain why the 900MHz ISM band exists given the better coverage) being relatively well known at the time 3) Separation, at least originally, from heavily populated bands at the time
Note that the $500 funding goal would only allow for 10 hours of discovery (exc. email & per-page costs), which may not be a lot if the investigator needs to find meeting minutes, memos and communications with other regulatory bodies from over half a century ago.
Re: Why 2.4GHz? Chasing wireless history
#4Is it really true that microwaves would work on that whole range of frequencies? I thought there was a water resonance at 2.4 GHz that they were designed to excite.
Re: Why 2.4GHz? Chasing wireless history
#5Is it really true that microwaves would work on that whole range of frequencies? I thought there was a water resonance at 2.4 GHz that they were designed to excite.
A myth! See http://en.wikipedia.org/wiki/Microwave_oven#Principles - second paragraph.
Re: Why 2.4GHz? Chasing wireless history
#6I always assumed those were set aside as unlicensed spectrum and that was why so many things existed along those bands. Probably also some propagation characteristics?
Re: Why 2.4GHz? Chasing wireless history
#7Re: Why 2.4GHz? Chasing wireless history
#8Is it really true that microwaves would work on that whole range of frequencies? I thought there was a water resonance at 2.4 GHz that they were designed to excite.
A myth! See http://en.wikipedia.org/wiki/Microwave_oven#Principles - second paragraph.
I feel totally stupid for not knowing this. That's counteracted by what I now know is possible, though:
"Additionally, microwaves can melt certain types of rocks, producing small quantities of synthetic lava"
I know what I'm making for Thanksgiving.
Re: Why 2.4GHz? Chasing wireless history
#9I would say that a lot of the rationale would come from: 1) Availability of the 2.4GHz band in other established countries 2) Propagation characteristics of 2.4GHz (this would also explain why the 900MHz ISM band exists given the better coverage) being relatively well known at the time 3) Separation, at least originally, from heavily populated bands at the time Note that the $500 funding goal would only allow for 10…
At the time there was very little going on that high up in the band, it seems that the US rep at the ITU Atlantic City conference was pushing for it to be a worldwide standard because of the possibility that the then fridge sized ovens (raytheon radarrange) would be used on ships, which would of course travel to other regulatory domains.
I don't think propagation was a factor at the time, as there doesn't seem to be anything special about that frequency. The S-band is also around there which works fine for long distance.
You're right, 500 won't go very far, but I was sceptical that anyone would care enough for it to get going at all! Great to see the response so far though. Happy to answer any questions - Hugh
Re: Why 2.4GHz? Chasing wireless history
#10I would say that a lot of the rationale would come from: 1) Availability of the 2.4GHz band in other established countries 2) Propagation characteristics of 2.4GHz (this would also explain why the 900MHz ISM band exists given the better coverage) being relatively well known at the time 3) Separation, at least originally, from heavily populated bands at the time Note that the $500 funding goal would only allow for 10…
At the time there was very little going on that high up in the band, it seems that the US rep at the ITU Atlantic City conference was pushing for it to be a worldwide standard because of the possibility that the then fridge sized ovens (raytheon radarrange) would be used on ships, which would of course travel to other regulatory domains. I don't think propagation was a factor at the time, as there doesn't seem to be…
I explain my take on the documents I've found so far, and the band's eventual rise to Wi-Fi fame a little better here, though I'll have to dig out the references page a little later http://www.skynet.ie/~teslacut/appendixA.pdf