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" <[email protected]> To: "WISPA General List" <[email protected]> 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 <[email protected]> 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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