Doesn't it stand for "effective isotropic radiated power"? Isn't your EIRP the same no matter what receive antenna is on the other end?
I get your point, to have a sufficiently strong signal at the distant receiver you could lower the transmit power and make up for it with a more effective receive antenna. Respectfully, Greg On Nov 1, 2009, at 11:24 AM, Marlon K. Schafer wrote: > Yeah. > > People all too often forget that eirp is a RECEIVE number not a > TRANSMIT > number. All it takes is big, big ears and you can hear the other > end from a > very long ways away. Makes for much less noise in the area too. > > I hate the trend toward high power radios with low power antennas. > > You guys do realize that 2.4, 900 and 5.8 gig bands limit you to a 6 > (that's > S-I-X) dB antenna if you use a 1 watt (30 dB) radio? Base station > especially. For CPE you can use higher gain cpe antennas on 5 gig > and still > be OK within the rules. > > But all of these stupid, noisy, wasteful, cpe systems with 1 watt > radios and > 19dB panels make a mess of your networks. (and mine) > > marlon > > ----- Original Message ----- > From: "Mike Hammett" <wispawirel...@ics-il.net> > To: "WISPA General List" <wireless@wispa.org> > Sent: Saturday, October 31, 2009 10:50 AM > Subject: Re: [WISPA] Backhaul Questions > > >> 30 dB EIRP with a 44 DBi antenna on each side over 73 miles >> produces -75 >> signal. I'll let him say what he did to make it work, but it's >> certainly >> possible. >> >> >> ----- >> Mike Hammett >> Intelligent Computing Solutions >> http://www.ics-il.com >> >> >> >> >> From: Bret Clark >> Sent: Saturday, October 31, 2009 11:02 AM >> To: WISPA General List >> Subject: Re: [WISPA] Backhaul Questions >> >> >> Man...what is the EIRP on these links that people are posting high >> bit >> rates? As someone else stated, gotta wonder if the FCC won't start >> getting >> suspicious at some point. >> >> Travis Johnson wrote: >> 73 miles... and I get 28Mbps total (14Mbps each direction) using a >> 20mhz >> channel. >> >> Travis >> >> >> Josh Luthman wrote: >> Travis is getting 28 megs on a really long backhaul - like 58 miles? >> >> You will not see >30. >> >> On 10/31/09, Eric Rogers <ecrog...@precisionds.com> wrote: >> Ok guys...Looking for both Mikrotik experience and others. We >> currently >> have a Mikrotik backhaul between each of our towers using NStreme >> and we >> have been extremely happy with the performance. We recently >> upgraded a >> tower because we were hitting 15M or so during peak times and was >> afraid >> it couldn't handle much more. We upgraded that backhaul to a >> Motorola >> PTP for future capacity. >> >> >> >> The questions: >> >> >> >> MT Gurus: >> >> Each backhaul ranges in distance, each ranges from 3 miles (3 >> backhauls) >> and the rest are about 12 miles (5 backhauls). Since we have been >> using >> Mikrotik, I have reliably seen up to 10 Meg, and I am afraid 15 Meg >> is >> pushing the envelope on a 20 MHz channel. >> >> >> >> How much capacity can I reliably push on a 20 MHz channel using >> NStreme? >> >> >> >> Other Gurus: >> >> I understand the following are loaded questions, but budget is around >> $1000-3000 range and the capacity needs to be around the 60Meg mark >> (30 >> each way or without a defined 1:1 guarantee, capability to flex and >> be >> able to push 30M each way). >> >> >> >> If I start upgrading to larger backhauls on busy links, what type of >> equipment should I look at? >> >> What can support VoIP? >> >> Anything that GPS times for frequency reuse? >> >> Anything work in the 5.4GHz range at a 12 mile distance? >> >> >> >> Eric Rogers >> >> Precision Data Solutions, LLC >> >> (317) 831-3000 x200 >> >> >> >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! 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