You decrease the radio output. Any good radio can do negative dB. 24 dB radio + 6 dBi omni = 30 dB EIRP
2 dB radio + 28 dBi 2' antenna = 30 dB EIRP -7 dB radio + 37 dBi 6' antenna = 30 dB EIRP It's still only 30 dB you say? Well, the receive antenna is 9 dB more, giving you overall 9 dB more on the whole link. That 6 dB omni would only be able to have a 0.75 mile link vs. 30 miles for a 6'. If I were to be ignoring that 30 dB EIRP limit, you'd have the following: 24 dB radio + 6 dBi omni = 30 dB EIRP for 0.75 miles 24 dB radio + 28 dBi 2' antenna = 52 dB EIRP over 100 miles (the calculator doesn't accept more than 100) Yes, I know you're not going to get that in real life, but you really can't have this kind of comparative discussion with real world numbers because the real world is different everywhere at different times. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------- From: "Jerry Richardson" <jrichard...@aircloud.com> Sent: Wednesday, August 19, 2009 1:29 PM To: "WISPA General List" <wireless@wispa.org> Subject: Re: [WISPA] Bullet M5 HP > How is the size of the dish going to help if the EIRP is capped at 30dB? > This band does not following the same PTP rules as 5.7. Freespace loss is > going to increase but the 30dB EIRP is constant. > > Jerry > > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Mike Hammett > Sent: Wednesday, August 19, 2009 10:44 AM > To: WISPA General List > Subject: Re: [WISPA] Bullet M5 HP > > I know. 2' dishes will do 10 miles. 3' does 15 miles. 4' does 20 miles. > 6' does 30 miles. All within 30 dB EIRP. Obviously radio\antenna > certification limits apply. I figured a PtP radio salesman would have > known > that. ;-) > > > ----- > Mike Hammett > Intelligent Computing Solutions > http://www.ics-il.com > > > > -------------------------------------------------- > From: "Dave Rumore" <drum...@redlinecommunications.com> > Sent: Wednesday, August 19, 2009 12:12 PM > To: <wireless@wispa.org> > Subject: Re: [WISPA] Bullet M5 HP > >> There is an FCC EIRP maximum of 30 dB in 5.4 GHz that will limit the >> range >> of any radio legally operating in this band. >> >> ----- Original Message ----- >> From: wireless-boun...@wispa.org <wireless-boun...@wispa.org> >> To: WISPA General List <wireless@wispa.org> >> Sent: Wed Aug 19 12:47:59 2009 >> Subject: Re: [WISPA] Bullet M5 HP >> >> There's 250 MHz available in mid 5 GHz. It can easily do 10 miles on a >> PtP. >> With bigger dishes, it can obviously go farther. >> >> >> ----- >> Mike Hammett >> Intelligent Computing Solutions >> http://www.ics-il.com >> >> >> >> -------------------------------------------------- >> From: "Rubens Kuhl" <rube...@gmail.com> >> Sent: Wednesday, August 19, 2009 11:13 AM >> To: "WISPA General List" <wireless@wispa.org> >> Subject: Re: [WISPA] Bullet M5 HP >> >>>> Ubiquiti claims 150 megs of TCP/IP throughput, which is possible if you >>>> add >>>> upload and download as is common in the unlicensed world. >>>> >>>> I couldn't tell from any documentation whether they were 20 MHz or 40 >>>> MHz. >>>> The FCC certification wasn't overly clear, but I think it can do both. >>> >>> It can do both but require 40 MHz channels to achieve 150Mbps+ MIMO >>> throughput and 100Mbps+ SISO throughput. >>> Finding a 40 MHz window that is clean on both vertical and horizontal >>> is quite a challenge these days. >>> >>> >>> Rubens >>> >>> >>> -------------------------------------------------------------------------------- >>> WISPA Wants You! Join today! >>> http://signup.wispa.org/ >>> -------------------------------------------------------------------------------- >>> >>> WISPA Wireless List: wireless@wispa.org >>> >>> Subscribe/Unsubscribe: >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> Archives: http://lists.wispa.org/pipermail/wireless/ >>> >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > -------------------------------------------------------------------------------- > WISPA Wants You! 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