I read that information about the 2.4ghz band in an article in Network Magazine on
wireless networking. Sorry for the misinformation.
Cory
On Tue, Jan 30, 2001 at 12:48:22AM -0800, James S. Kaplan wrote:
> Absolute BS!!
>
> Tell me, sir, what is the approximate size of a water molecule?
> Lessee...f/300=wavelength in m,
> so, ummmm 2.4 GHz is ~13cm. Water is measured in nM, if memory serves me
> correctly. You need to learn some radio theory....basic stuff man. As I
> stated earlier...2.4GHz is not prone to vapor attenuation, and since
> your devices aren't designed to radiate more than a few hundred
> feet...unless you were in an exceptionally
> dense vapor (IE under water), water isn't going to contribute more than
> .1dB to your system losses. Your
> neighbours microwave oven will cause more loss at your receiver than water
> ever will. Period.
>
> The reason 2450MHz is unlicensed is purely due to it's proximity to ISM,
> Industrial, Scientific & Medical
> devices (IE wood dryers, diathermy and sounding devices). If you were a
> ham, you'd know this. Since your
> not, your off the hook on the history lesson, but not the theory. You want
> a rant on wave propagation vs
> frequency/air+water content?
>
> Microwaves do not "set up" an electric field in the oven. Oy! Nothing
> vibrates either. Cripes, wtf are they
> teaching for physics theses days?
>
> If you all would like a lesson some Thursday on Radio Wave Propagation 101,
> I'd be happy to sit
> with you until you know what you're talking about. If not, please by all
> means do some homework and
> prove me wrong. There are plenty of good references available. I'll lend
> you whatever you need from
> my radio library. See esp. ARRL Handbook, Radio Engineering, Terman,
> Practical Antenna Considerations, Jasik,
> etc, etc.
>
> jk
>
> At 10:34 AM 1/29/2001, you wrote:
> >The resonant frequency of water is right about 2.4Ghz. This is the reason
> >the 2.4ghz band (+/- 50Hz from 2400Hz) is unlicensed.
> >
> >The water molecule can be conceptualized as a mickeymouse molecule, with a
> >big oxygen atom, and two smaller hydrogen atoms sticking up like MM
> >ears. It does not sit in a balanced structure.
> >
> >Microwaves work by setting up an electric field inside the oven. This
> >electric field (operating at about 2.4Ghz) tickles the water molecules,
> >causing them to vibrate more, thus elevating the tempurature of the water
> >(or food, etc).
> >
> >I don't know if rain is a sole cause of 2.4ghz communications being
> >dampened. From speculation, I suppose it's possible.
> >
> >Cory
>
> -----------------------------
> James S. Kaplan KG7FU
> Eugene Oregon USA
> [EMAIL PROTECTED]
> http://www.rio.com/~kg7fu
> ICQ # 1227639
> Have YOU tried Linux today?
> -----------------------------
