|
|
| Line 1: |
Line 1: |
| | {{Discussion}} | | {{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>
| |
