no, 900 mhz rfid would be 20mhz bands. They MUST be exceeding EIRP, tho, because I've never seen problems with rfid at close ranges like that, and not having good reads with normal, or even less than normal power. Problem is, rfid is 100% tx/rx 100% of the time.
How far away is this from you ? I guarantee it's a piece of bad equipment - cable or such - on their end, "leaking". Certified letter or bb gun, your choice... ;) -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Moldashel Sent: Sunday, March 11, 2007 2:41 PM To: WISPA General List Subject: Re: [WISPA] walmart rfid If their signal occupies the whole band it is probably FHSS in nature. So changing to a 5 or 10 Mhz. channel will not be possible. Also, it may not be possible to turn down the power. So it may not be that simple. A certified letter from an attorney is probably more in order. Unfortunately using unlicensed spectrum does not leave you with much recourse. This has been discussed over and over on these lists but the final outcome is always that you are taking a risk using Part 15 spectrum. Good luck in your battle. Bob Ray & Jean wrote: > Travis > Thanks for the input .that is a possible solution but not one that > could be implemented quickly or easily.It would require a new Hpol > omni about $2200 a climb to install it and a trip to about 100 > customers home to change their eum antenna to h pol.This may be how it > gets resolved but really all we need to to do is have them turn the > power down on their equipment which only needs to reach 100 ft or the > area of their loading dock.or drop to a 5or 10 mhz channel that is not > on our freq of 918.4.It would be a simple problem to resolve if we > could get any cooperation from walmart.Any ideas on how how we could > create interference to their system to get their attention.I realize > this is not the proper way to resolve the problem but it might > encourge them to be better rf neighbors maybe. > Thanks > Ray Hill > ----- Original Message ----- From: "Travis Johnson" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Sunday, March 11, 2007 11:47 AM > Subject: Re: [WISPA] walmart rfid > > > Hi, > > You may want to try changing polarity and see if that helps. Often going > from vertical to horizontal will make a big difference. > > Travis > Microserv > > Ray & Jean wrote: > >> Hello List We have an interference problem come up this week that we >> have been unable to resolve.Hopefully someone here has some input on >> how to resolve it.The problem is walmart installed a rfid scanning >> system at there loading dock which instantly raised the noise floor >> at our 900 mhz waverider access point by 20 db which killed about 30 >> of our weakest links.this equipment is operating across the whole >> band so there is no way to change channels and get away from it.The >> walmart store manager says its not his problem and refuses to call >> the company that installed it .I called the company which is adt >> security and they refuse to do anything unless walmart request >> it.walmart home office will not return my calls and the regional >> manager actually hung up on me and will not take calls from us now.We >> have been very polite with them upto this point and gave them no >> reason to act like jerks.Does anyone have any suggestions on how to >> resolve this problem? >> Thanks >> Ray Hill >> surfmore. net >> > -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
