Yes, you get more signal, but you have much less spectrum for your spread spectrum radio to operate in. Spread spectrum doesn't always use the full 20MHz, it will skip around -- that's the "spread" part of it. So if you lower that to 5MHz, then you have virtually no "spread" and anything that may be inside that 5MHz will cause you a much more deteriorated performance than if it was in your 20MHz.
On Sun, Nov 22, 2009 at 9:08 PM, Mike <m...@aweiowa.com> wrote: > I should think the opposite is true. Halve the signal, improve > signal to noise 3 dB. Half it again and the improvement is 6 dB > signal to noise. Should give you way more margin. My tests prove that > out. > > > At 08:44 PM 11/22/2009, you wrote: > >IIRC, 5MHz and 10MHz is more sucepstible to interference than 20MHz. > > > >On Sun, Nov 22, 2009 at 7:38 PM, Israel Lopez-LISTS < > >ilopezli...@sandboxitsolutions.com> wrote: > > > > > I'm gonna have to set up the environment again. Only thing I cant > > > simulate right now is distance. > > > > > > As long as it wasnt some voodoo config setting that made it work > better, > > > I might have to play with the Mobile NS2's settings for it to play > nicely. > > > > > > OT: What is CCQ? > > > > > > -Israel > > > > > > Josh Luthman wrote: > > > > It is very weird isn't it? > > > > > > > > Vi is better the Emacs. > > > > > > > > On 11/22/09, Mike <m...@aweiowa.com> wrote: > > > > > > > >> Josh: > > > >> > > > >> I thought that too. I have a handful of customers on a 5 MHz > > > >> sector. Winbox shows this: > > > >> > > > >> Emacs! > > > >> > > > >> > > > >> Mike > > > >> > > > >> At 07:32 PM 11/22/2009, you wrote: > > > >> > > > >>> I believe when you half the channels the rates also get halved - > from > > > >>> 54mbit > > > >>> to 27mbit max (that is from 20mhz to 10mhz channels). > > > >>> > > > >>> I also can't see why you're voice would be having problems in half > or > > > >>> quarter channels unless there is a software bug. It should only > > > improve > > > >>> unless you're using all available bandwidth. > > > >>> > > > >>> Josh Luthman > > > >>> Office: 937-552-2340 > > > >>> Direct: 937-552-2343 > > > >>> 1100 Wayne St > > > >>> Suite 1337 > > > >>> Troy, OH 45373 > > > >>> > > > >>> "The secret to creativity is knowing how to hide your sources." > > > >>> --- Albert Einstein > > > >>> > > > >>> > > > >>> On Sun, Nov 22, 2009 at 8:08 PM, Chuck Hogg <ch...@shelbybb.com> > > > wrote: > > > >>> > > > >>> > > > >>>> First, you should have a better signal than -70 at <5Miles away > with a > > > >>>> 24dB/NS2 antenna and a B2HP/9dB omni. I get 65 or better with a > 19dB > > > >>>> panel. > > > >>>> > > > >>>> Don't forget, 10MHz channel is 1/2 available bandwidth and 5MHz is > 1/4 > > > >>>> available bandwidth. Really, you will get about 7-10MBit > aggregate > > > >>>> (depending on how many customers) on a 5MHz channel connected at > > > 54MBit, > > > >>>> which requires signals at -74dBm with a good fade margin (10dB). > > > Also, > > > >>>> the TX power is significantly less for 54MBps (23dBm) vs > > > 24MBps(28dBm), > > > >>>> less than half. Likely, you are connecting at 48MBps or 36Mbps, > which > > > >>>> at that rate your total available "real case" bandwidth is as > little > > > as > > > >>>> 4MBps, while at 20MHz you are at 15+. > > > >>>> > > > >>>> A narrower channel should not affect your transmission, likely > will > > > make > > > >>>> signals better, roughly double (+3dBm) from 20-10, and double from > > > >>>> 10-5(total +6dBm). > > > >>>> > > > >>>> Regards, > > > >>>> Chuck Hogg > > > >>>> Shelby Broadband > > > >>>> 502-722-9292 > > > >>>> ch...@shelbybb.com > > > >>>> http://www.shelbybb.com > > > >>>> > > > >>>> > > > >>>> -----Original Message----- > > > >>>> From: wireless-boun...@wispa.org [mailto: > wireless-boun...@wispa.org] > > > On > > > >>>> Behalf Of os10ru...@gmail.com > > > >>>> Sent: Sunday, November 22, 2009 6:20 PM > > > >>>> To: WISPA General List > > > >>>> Subject: Re: [WISPA] 10MHz, 5MHz - unstable for voice? > > > >>>> > > > >>>> Well next time definitely bring more food! Beef jerky and granola > > > bars. > > > >>>> > > > >>>> In my testing the narrower channels just made things slower. I was > > > >>>> testing in a pristine area where there was no other 5.8GHz going > on. > > > >>>> >From what I hear if the environment had been polluted performance > > > might > > > >>>> have actually gone up with the narrower channels. > > > >>>> > > > >>>> >From what I've read narrower channels doesn't effect packet size > or > > > >>>> transport. But switching to WDS bridged does. > > > >>>> > > > >>>> Greg > > > >>>> On Nov 22, 2009, at 6:15 PM, Israel Lopez-LISTS wrote: > > > >>>> > > > >>>> > > > >>>>> Its not in the field, but it is sitting here in my bedroom > looking > > > >>>>> > > > >>>> cool :). > > > >>>> > > > >>>>> I was thinking that using the 10/5MHz bandwidth required one to > setup > > > >>>>> something else. I'm not that familiar with the use of > half/quarter > > > >>>>> > > > >>>> rate > > > >>>> > > > >>>>> channels and how that affects the frame transport/packet size > etc,. > > > >>>>> > > > >>>>> I wonder if it was environment based rather than > > > >>>>> 'software/configuration' based. If I get some time this evening > I > > > >>>>> > > > >>>> might > > > >>>> > > > >>>>> setup the gear again for more focused testing (Testing in the > field > > > >>>>> > > > >>>> with > > > >>>> > > > >>>>> volunteers who are cold and hungry dont usually respond well to > > > >>>>> > > > >>>> testing > > > >>>> > > > >>>>> plans). > > > >>>>> > > > >>>>> -Israel > > > >>>>> > > > >>>>> os10ru...@gmail.com wrote: > > > >>>>> > > > >>>>>> Just for kicks I'd try WDS bridged. Do you have control from > where > > > >>>>>> > > > >>>> you're at now? Is the equipment still set up? > > > >>>> > > > >>>>>> Greg > > > >>>>>> > > > >>>>>> On Nov 22, 2009, at 6:02 PM, Israel Lopez-LISTS wrote: > > > >>>>>> > > > >>>>>> > > > >>>>>> > > > >>>>>>> @Travis Johnson - Yes Upgraded to newest firmware for the two > units > > > >>>>>>> > > > >>>>>>> @os10rules - Nope, Fixed was simple AP and Mobile was Station > modes > > > >>>>>>> > > > >>>>>>> os10ru...@gmail.com wrote: > > > >>>>>>> > > > >>>>>>> > > > >>>>>>>> Running WDS bridged? > > > >>>>>>>> > > > >>>>>>>> Greg > > > >>>>>>>> On Nov 22, 2009, at 5:37 PM, Israel Lopez-LISTS wrote: > > > >>>>>>>> > > > >>>>>>>> > > > >>>>>>>> > > > >>>>>>>> > > > >>>>>>>>> Hey All, > > > >>>>>>>>> > > > >>>>>>>>> I did some field tests (for overseas volunteer project) with > some > > > >>>>>>>>> Ubituiti gear; Nanostation2 & Bullet2HP. > > > >>>>>>>>> > > > >>>>>>>>> One thing that was surprising was the performance degradation > > > when > > > >>>>>>>>> > > > >>>>>>>>> switching from 20MHz to 10MHz/5MHz. Our tests were Raw > Bandwidth > > > >>>>>>>>> Tests(AirOS), Video (VLC UDP Stream), Voice (Trixbox G711 > Voice > > > >>>>>>>>> > > > >>>> Call), > > > >>>> > > > >>>>>>>>> and MTR (Latency, Jitter) > > > >>>>>>>>> > > > >>>>>>>>> I still have data to collect and prepare a report for the > tech > > > >>>>>>>>> > > > >>>> team, but > > > >>>> > > > >>>>>>>>> we did notice that when we switched to 10 or 5MHz bandwidth > our > > > >>>>>>>>> > > > >>>> voice > > > >>>> > > > >>>>>>>>> calls was greatly degraded. Only one way; from Fixed to > Mobile I > > > >>>>>>>>> > > > >>>> could > > > >>>> > > > >>>>>>>>> hear the Fixed station easily. Mobile to Fixed the voice was > > > >>>>>>>>> > > > >>>> choppy. > > > >>>> > > > >>>>>>>>> We started to get packet loss & massive jitter on 10MHz, just > > > >>>>>>>>> > > > >>>> going back > > > >>>> > > > >>>>>>>>> to 20MHz made the links stable. > > > >>>>>>>>> > > > >>>>>>>>> Fixed Station: On a mountain side - HPOL 9dBI Omni > Directional > > > >>>>>>>>> > > > >>>> with a > > > >>>> > > > >>>>>>>>> Bullet2HP @400mW > > > >>>>>>>>> Mobile Station: 8km away near large body of water - Bullet2HP > > > >>>>>>>>> > > > >>>> @400mW w/ > > > >>>> > > > >>>>>>>>> 24dBi Directional (HPOL Alignment) -70dbm RSSI > > > >>>>>>>>> > > > >>>>>>>>> Any ideas? We are planning on using 10MHz channels & H-Pol > to > > > >>>>>>>>> > > > >>>> combat > > > >>>> > > > >>>>>>>>> any future spectrum pollution and voice calls over this > network > > > is > > > >>>>>>>>> > > > >>>> expected. > > > >>>> > > > >>>>>>>>> -Israel > > > >>>>>>>>> > > > >>>>>>>>> > > > >>>>>>>>> > > > >>>>>>>>> > > > >>>> > > > > ------------------------------------------------------------------------ > > > >>>> -------- > > > >>>> > > > >>>>>>>>> WISPA Wants You! 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