On Feb 17, 2013, at 4:32 PM, Owen DeLong <o...@delong.com> wrote: > > On Feb 17, 2013, at 4:17 PM, joel jaeggli <joe...@bogus.com> wrote: > >> On 2/17/13 12:18 PM, Jay Ashworth wrote: >>> ----- Original Message ----- >>>> From: "Owen DeLong" <o...@delong.com> >>>> I think by A you actually mean 5Ghz N. A doesn't do much better than G, >>>> though >>>> you still have the advantage of wider channels and less frequency >>>> congestion >>>> with other uses. >>> No, my ThinkPad doesn't *do* N, 5GHz or otherwise. Neither does my Sprint >>> EVO, nor, as near as I can tell, the Galaxy S4 I'm going to replace it >>> with this year (though on that one, I'm a tad less certain). >>> >>> I'd forgotten that N was dual band, though, yes. I can't say I've ever >>> needed the extra bandwidth N provides, personally, though certainly the >>> hotels we've been discussing might need more to share around. >> entirely orthonal to the frequency band used spatial division multipluxing >> as used by 802.11n is generally going to increase the SNR. >> >> so what you get out of A/N is: >> >> * more non-overlapping bands and therefore a much easier map coloring >> problem) >> * greater attenuation, which implies more limited range, but also less >> interferance. > > Greater attenuation is an oversimplification. 5Ghz penetrates things like > stucco and concrete better than 2.4. OTOH, 2.4 gets through trees and moist > air better. In dry air and/or a vacuum, they're similar. Neither penetrates > humans particularly well, though 5 tends to do slightly better. > >> * with N-mimo higher SNR if you have >= 2 antennas >> >> All of those things make the 5Ghz band a more attractive alternative for >> lots of applications. given that it's 5Ghz it also requires more power, >> which is a problem for cellphones, but not so much for tablets and laptops. > > OTOH, with 5Ghz, a high-gain antenna is ½ - ⅛ the size (depending on the type > of antenna) the size of a 2.4Ghz which also has advantages in portable > applications. >
Sorry… Hit send prematurely… An important consideration: A good high-gain antenna helps you with transmit _AND_ receive. More power helps you with transmit. > Owen >
