Man, that's ugly. I've never tested the spread of the older nanos, the new M series look as if they stay where you put them though. But that's a mess...........
Bob- -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Jeromie Reeves Sent: Thursday, June 24, 2010 12:56 AM To: WISPA General List Subject: Re: [WISPA] Maximum sector power? Do not forget OOB and the likes. I have been using AirView for a while to check on my sites and some were unacceptable to me (5mhz but still hitting 10 or 20mhz at -85) so I replaced the cards (all MT sites). I am unsure if the cards are bad, going bad, or just how they were working from day one. Swapped them, and they look much better. I have been hunting down interference (most of it not self, only 2 links were over lapping and that due to the spread on the cards). I noticed that some sites had a higher then expected noise floor. I tracked it down to pretty much all of my NS5's (non M's). There is a pretty high bleed from a number of them. The linked airview screen shot shows a site with nothing but a nano5 in AP WDS mode with no clients connected. It is set for 5mhz and ch 164. The step to -...@5.810 is present with in 30 seconds of powering the nano. The next step down, to about -...@5.793 a bit after that (60~90sec). This was taken with a rocket and 120* 16db sector about 10ft in front and 10ft below the nano. The nano is running stock firmware and will be replaced with a nano5m. http://img718.imageshack.us/img718/8832/snapshot3v.png On Wed, Jun 23, 2010 at 9:12 PM, Robert West <robert.w...@just-micro.com> wrote: > Stick with the rules, dude. You'll still get customers and you'll still > make money. > > One FCC visit can ruin your day, > > Bob- > > > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Fred R. Goldstein > Sent: Wednesday, June 23, 2010 5:41 PM > To: WISPA General List > Subject: [WISPA] Maximum sector power? > > I'm just a little confused about some of these nice-looking access points. > The UBNT Rocket M5, for instance, can put out +27 dBm. It plugs *right > into* a nice 19dB sector antenna. Okay, the smaller, > 120 dB sector is only 16 dB. Now math is not really my thing but I get a > total ERP there of +43 to 46 dBm. > > FCC Rule 15.247 states that the maximum transmitted power output for > digitally-modulated intentional radiators in the 5725-5850 MHz band > ("ISM") is 1 watt, and the maximum antenna gain is 6 dBi. Each additional > dB of antanna gain means one less dB of power. So the maximum ERP is 4 > watts (+36). > > Point-to-point is an exception in that specific band; it is allowed > unlimited antenna gain. But "point-to-multipoint systems, omnidirectional > applications, and multiple co-located intentional radiators transmitting the > same information" are under the cap. > > So am I correct in assuming that everybody who uses the Rocket M5, or any > other similar PtMP system for subscriber access, turns the transmitter power > REAL low (~+20 + feedline loss), in order to keep the ERP below +36? Or are > we assuming that since you're technically only transmitting and receiving to > one end user at a time, it's really PtP? > > SkyPilot's legal hack, of course, is to have eight 45 degree sector antennas > and only use one at a time, so it is legally PTP even with > +42 EiRP. And with advanced 11N 4x4 beamforming antennas, something > like that will become relatively easy. But we're not quite there yet. > Thoughts? > > -- > Fred Goldstein k1io fgoldstein "at" ionary.com > ionary Consulting http://www.ionary.com/ > +1 617 795 2701 > > > > ---------------------------------------------------------------------------- > ---- > WISPA Wants You! 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