<div dir="ltr"><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Dec 17, 2013 at 5:25 PM, <span dir="ltr"><<a href="mailto:dpreed@reed.com" target="_blank">dpreed@reed.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><font face="arial"><p style="margin:0px;padding:0px">I know it will just trigger raging arguments, but it turns out that 5 GHz propagates far better in normal housing than does 2.4 GHz.</p>
<p style="margin:0px;padding:0px"> </p>
<p style="margin:0px;padding:0px">In particular, actual scientific measurements of penetration of wood, fiberboard, concrete, brick, etc. have been done, and I can provide many of them (they are on my computer at home, I am in CA at the moment). The absorption of those materials is the same for both bands.</p>
<p style="margin:0px;padding:0px"> </p>
<p style="margin:0px;padding:0px">Second, the Fresnel zone is 1/4 the size for 5 GHz than 2.4 GHz. This means that energy passes through holes far more intensely (6 dB better) on 5 GHz.</p>
<p style="margin:0px;padding:0px"> </p>
<p style="margin:0px;padding:0px">Finally, 5 GHz modulations used in WiFi do not include the really lousy 802.11b modulations that are required for beacon signals to have legacy compatibility back to the beginning of 802.11b.</p>
<p style="margin:0px;padding:0px"> </p>
<p style="margin:0px;padding:0px">Please don't repeat this urban legend. Don't believe *anything* you read in The Register about EM waves, and don't believe computer scientists about electrical and electronic engineering.</p>
<p style="margin:0px;padding:0px"> </p>
<p style="margin:0px;padding:0px">In fact, 5 GHz, at the same power, is far superior for indoor signaling.</p></font></blockquote><div><br></div><div class="gmail_default">Dave,</div><div class="gmail_default"><br></div>
<div class="gmail_default">I'm happy to believe you...</div><div class="gmail_default"><br></div><div class="gmail_default">But then my personal observations of behavior of 2.4 vs. 5ghz need some explanation...</div><div class="gmail_default">
<br></div><div class="gmail_default">Could be </div><div class="gmail_default"> 1) the antenna involved, </div><div class="gmail_default"> 2) or the transmit power is not the same.</div><div class="gmail_default"> 3) the system's reporting of signal strength is defective (but my empirical observations of what works best has seemed to be correlated with that).</div>
<div class="gmail_default"><br></div><div class="gmail_default">I'm not likely to be able to do much about 1) (until we have different routers to play with, anyway...)</div><div class="gmail_default"><br></div><div class="gmail_default">
How do we get to the bottom on 2) or 3)?</div><div class="gmail_default" style="font-size:small"> - Jim</div><div class="gmail_default" style="font-size:small"></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<font face="arial"><div><div class="h5">
<p style="margin:0px;padding:0px"> </p>
<p style="margin:0px;padding:0px"><br><br>On Tuesday, December 17, 2013 1:51pm, "Jim Gettys" <<a href="mailto:jg@freedesktop.org" target="_blank">jg@freedesktop.org</a>> said:<br><br></p>
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<div class="gmail_quote">On Tue, Dec 17, 2013 at 12:54 PM, Michael Richardson <span dir="ltr"><<a href="mailto:mcr@sandelman.ca" target="_blank">mcr@sandelman.ca</a>></span> wrote:<br>
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<div><br> Fred Stratton <fredstratton@imap.cc> wrote:<br> > For best 5GHz results, get rid of your walls and doors...<br><br> > <a href="http://www.theregister.co.uk/2011/09/14/virgin_media_superhub_update_modem_mode/" target="_blank">http://www.theregister.co.uk/2011/09/14/virgin_media_superhub_update_modem_mode/</a><br>
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Yeah, in my house, my experience with 5Ghz is that it means the network<br> doesn't work.<br></blockquote>
<div style="font-size:small">I sometimes have a similar situation in my house. And I live in a radio quiet area, so I don't face the usual tradeoff of polluted 2.4ghz.</div>
<div style="font-size:small">But it does make it very hard to simply recommend 5 over 2.4ghz; there is no single "right answer"; the answer is "it depends" for the simple one router case.</div>
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<div>And the right solution is more routers, and using 5ghz once you have them.</div>
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<div style="font-size:small">Sigh...</div>
<div style="font-size:small">- Jim</div>
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