I keep a 10mhz separation between the channels. Lesson learned.
-----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Fred Goldstein Sent: Wednesday, August 04, 2010 3:54 PM To: WISPA General List Subject: Re: [WISPA] Multiple sectors, one frequency? At 8/4/2010 03:37 PM, Jerry Richardson wrote: >It will not work. > >But you would be surprised how well these run at 5 or 10 MHz channels. With how much spacing between them? If I could put them on adjacent 10 MHz center frequencies, that would solve a lot of problems, and even 5 MHz channels with 10 MHz spacing (and thus a 5 MHz guard band) would be reasonable. But 20 MHz spacing is problematic. How much throughput can a quarter-channel get? The Rocket data sheet is not very complete; it doesn't even mention subchannel support. The RM5 spec sheet says that MCS12 has -84 dB sensitivity. That gets 78 Mbps in a full 20 Mbps channel, 162 in a double-wide, and a bit more with the short guard interval. If I could share 15 Mbps among the sector users, in 5 MHz, I think everyone should be happy. And I'd expect -89 to -90 sensitivity. >Jerry Richardson >Sent Mobile > >On Aug 4, 2010, at 12:33 PM, "Fred R. Goldstein" ><fgoldst...@ionary.com> wrote: > > > If I have a site with, say, Ubiquiti Rocket M5 radios plugged into > > 120 degree sector antennas, with Airmax (TDMA) turned on, do they > > have to be on separate frequencies, or can they coexist on one? The > > 5.8 GHz band is kind of crowded to be having three access > > frequencies plus two or more backhaul frequencies... thanks. > > -- Fred Goldstein k1io fgoldstein "at" ionary.com ionary Consulting http://www.ionary.com/ +1 617 795 2701 ---------------------------------------------------------------------------- ---- 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/
