Talk:Wi-Fi How To
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{{Discussion}} __FORCETOC__ == Back-to-back antennas == OK, I have removed my discussion from here. :--[[User:Dave M.|Dave M.]] 02:44, 7 December 2008 (UTC) <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1"> <tr> <td> </td> <td><b><font color="#800000"><i>[[User:JeffLiebermann|Jeff's]] response:</i></font></b><p>Revised number using most of his numbers and only correcting coax losses and</p> <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" id="AutoNumber2"> <tr> <td> </td> <td>Transmitter</td> <td> </td> <td>+15dBm</td> </tr> <tr> <td> </td> <td>Transmit coax loss</td> <td> </td> <td>-1dB (about 0.5 meters with connectors)</td> </tr> <tr> <td> </td> <td>Transmit antenna</td> <td> </td> <td>+7dBi</td> </tr> <tr> <td> </td> <td>Free space loss</td> <td> </td> <td>-54dB at 5 meters</td> </tr> <tr> <td> </td> <td>Receive antenna</td> <td> </td> <td>+7dBi</td> </tr> <tr> <td> </td> <td>Rx and tx coax loss</td> <td> </td> <td>-1dB (about 0.5 meters with connectors)</td> </tr> <tr> <td> </td> <td>2nd transmit antenna</td> <td> </td> <td>+8dBi</td> </tr> <tr> <td> </td> <td>Free space loss</td> <td> </td> <td>-60dB at 10 meters</td> </tr> <tr> <td> </td> <td>Rx antenna gain</td> <td> </td> <td>0dBi (internal laptop antenna)</td> </tr> <tr> <td> </td> <td>Delivered RX power</td> <td> </td> <td>??dB</td> </tr> </table> Doing the arithmetic, I get -79dBm which is low but usable to about 24 Mbits/sec. See my chart at [http://802.11junk.com/jeffl/rx-sens/receiver%20sensitivity.htm Wi-Fi Receiver Sensitivity].<br> I don't want to get into a discussion on new material in the "talk" section of the wiki. It belongs in the [[alt.internet.wireless|newsgroup alt.internet.wireless]]</a>.<br> <i><b><font color="#800000">I've posted this in the newsgroup under the subject "[http://groups.google.com/group/alt.internet.wireless/browse_thread/thread/1aee8f602c594506# Back-to-back antennas]".<br>Please post any further discussion there. Thanks. --[[User:JohnNavas|John Navas]] 17:51, 6 December 2008 (UTC)</font></b></i></td> </tr> </table>
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