<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Date: Thu, 09 Dec 2010 15:42:43 +0100<br>
From: Mitar <<a href="mailto:mitar@tnode.com">mitar@tnode.com</a>><br>
To: International Summit for Community Wireless Networks Participant<br>
E-mail List <<a href="mailto:cwn-summit@lists.chambana.net">cwn-summit@lists.chambana.net</a>><br>
Subject: Re: [CWN-Summit] Law change<br>
<br>
<br></blockquote><div><br><snip><br> <br></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Yes, but you very soon (too soon) get over the limits. This is what I am<br>
saying. Why would somebody be punished because he used very very<br>
directed antenna because he wanted to leak very little in other directions?<br>
<br>
What I am arguing for is that using directional antennas should be<br>
preferred and (by law) encouraged. And I am arguing that what it is<br>
important is how much energy you bring into the air and not how you<br>
shape this energy. So limits should be for the energy, not that you<br>
cannot use something because you know how to squeeze everything possible<br>
from this energy you are allowed to use.<br>
<br>
<br>
Mitar<br></blockquote></div><br>In the US, the FCC rules do currently encourage directive antenna use in the unlicensed bands. The point-to-point rules (for directive antennas) have higher allowed EIRP limits than point-to-multipoint links. For example for PtP links at 2.4GHz you only have to turn down your transmit power 1 dB for every +3dB in antenna gain over 6dB. So it's a net win to use a more directive antenna. The 5.8GHz bands also have different transmit power limits for PtP and PtMP links; I think for UNII-3 you can use up to a 23dBi antenna without turning down the power at all on PtP links.<br>
<br>Bill<br><br>-- <br>Bill Comisky<br><a href="mailto:bcomisky@pobox.com">bcomisky@pobox.com</a><br>