And I was just getting a handle on software switchable polarity:) Thanks! On Tue, Feb 2, 2010 at 3:26 PM, Lawrence E. Bakst <[email protected]> wrote:
> 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" <[email protected]> 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 > >> <[email protected]>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" <[email protected]> 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 < > [email protected] > >>>>> 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: [email protected] [mailto:wireless- > >>>>> [email protected]] 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: [email protected] > >>>>> > >>>>> Subscribe/Unsubscribe: > >>>>> http://lists.wispa.org/mailman/listinfo/wireless > >>>>> > >>>>> Archives: http://lists.wispa.org/pipermail/wireless/ > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> --- > >>>>> --- > >>>>> --- > >>>>> --- > >>>>> --- > >>>>> ----------------------------------------------------------------- > >>>>> WISPA Wants You! 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