You guys should know that the 802.11 radios I have worked with can have built in attenuators, sometimes more than one, that can get switched on and off based on RX power level sensed in hardware. How many and at what levels the attenuators kick in varies from card to card and vendor to vendor. ODMs have the ability to change this part of the design. If implemented properly, which may not always be the case, the built in attenuators should prevent most RX overload.
To make it even more complicated there can also be LNAs that can switched on or off. I mention all this because if your mental model of how the card works assumes that everything is linear, it could be wrong. Best, leb At 2:45 AM -0500 2/2/10, Jerry Richardson wrote: >I would say yes with one caveat, If you need -71 to get full >modulation and need to guarantee that it holds like in a PTP link then >you would want additional fade margin. Assuming an additional 10db >would mean you would want -61 minimum. A PTMP network may or may not >need that kind margin and could use less power. > >Ideally one only uses enough power to acheive the required levels to >make the link plus some margin. Anything over that is just polluting >your own rf space. > >Sent Mobile >Jerry Richardson >airCloud Communications > >On Feb 1, 2010, at 7:09 PM, "RickG" <rgunder...@gmail.com> wrote: > >> Floor is -98. So, using 20dB fade margin would mean -70's is good? >> >> On Mon, Feb 1, 2010 at 10:01 PM, Jerry Richardson >> <jrichard...@aircloud.com>wrote: >> >>> I tend to use 20dB fade margin. If the floor is -80, then -60 is >>> going >>> to be great. This works until you are dealing with a -60dB floor >>> cause >>> -40dB is going to be too hot and overload the Rx of the radios. >>> >>> Sent Mobile >>> Jerry Richardson >>> airCloud Communications >>> >>> On Feb 1, 2010, at 5:56 PM, "RickG" <rgunder...@gmail.com> wrote: >>> >>>> Ya, thats what I do. I'm just concerned about what the best power >>>> level is? >>>> I hate to create a monster based on the wrong settings. >>>> >>>> On Mon, Feb 1, 2010 at 8:21 PM, Robert West <robert.w...@just-micro.com >>>>> wrote: >>>> >>>>> I have a few like that. Cheap and quick for low density >>>>> population. Use a >>>>> pac grid for the backhaul and a bullet with an omni for the AP. >>>>> Check your >>>>> polarity, make sure you're on the right orientation and right >>>>> radio. My >>>>> grids are horz. Pol and the omnis, well..... Vertical of course! >>>>> >>>>> Bob- >>>>> >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: wireless-boun...@wispa.org [mailto:wireless- >>>>> boun...@wispa.org] On >>>>> Behalf Of RickG >>>>> Sent: Monday, February 01, 2010 8:08 PM >>>>> To: WISPA General List >>>>> Subject: [WISPA] power >>>>> >>>>> OK, I need a little input. I've got several "poor mans repeaters" >>>>> around by >>>>> using a pair of bullets, one for backhaul and the other for the AP. >>>>> Today, >>>>> I >>>>> installed a Bullet on a new customer that was a stones throw away >>>>> from the >>>>> AP. At full power, he got just under 1Mbps. Turning down the power, >>>>> he got >>>>> 3Mbps+. Is turning down the power on the CPE side on a test and >>>>> trial basis >>>>> or is there some kind of method to it? >>>>> -RickG >>>>> >>>>> >>>>> >>>>> --- >>>>> --- >>>>> --- >>>>> ------------------------------------------------------------------- >>>>> ---- >>>>> 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/ >>>>> >>>> >>>> >>>> --- >>>> --- >>>> --- >>>> --- >>>> -------------------------------------------------------------------- >>>> 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/ >>> >> >> >> --- >> --- >> --- >> --- >> -------------------------------------------------------------------- >> 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/ -- l...@iridescent.org -------------------------------------------------------------------------------- WISPA Wants You! 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