CAN THAT BE SOME FORM OF RADAR? -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Eje Gustafsson Sent: Saturday, June 19, 2010 12:01 PM To: 'WISPA General List' Subject: Re: [WISPA] interference from ships
Possible but don't quit believe so since 900MHz GSM uses 890-914Mhz for uplink (cell to base station), and 921-960Mhz for download (basestation to cell). That strong signal wouldn't come from cells and the basestation would just ruin the top part of the frequency. Maritime cell systems I seen don't offer 3G type services and GSM gprs/edge channel size is 200khz. 4G will have 4 to 20MHz dynamic channel size. Would really need to verify that the signal for sure is coming from the ship and not somewhere else. If that is the case maybe look at getting hold of someone from the ship to check with them what it might be. Dont forget to shut down your own AP while you run the SA at the AP location to avoid false readings and make sure it's not actually something newly installed at that location. / Eje -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of RickG Sent: Saturday, June 19, 2010 1:23 PM To: WISPA General List Subject: Re: [WISPA] interference from ships "Plug the damn hole!" - lol! Sorry, I couldnt help it :) Since it's a UK ship, I wonder if this has anything to do with it? http://www.eubusiness.com/topics/telecoms/mobile-ships.01/ On Sat, Jun 19, 2010 at 8:14 AM, jp <j...@saucer.midcoast.com> wrote: > We've got a 700' drilling ship moored about a mile off our coast for a > few days for repairs. > > http://www.stena-drilling.com/sub.asp?m=drilling&p=stenaforth > > Since it came in, 900mhz within a couple miles of it has stopped > working. We went out with the spectrum analyser after the Alvarion > software spectrum analyzer went off the charts. The HP spectrum analyzer > with a 9dbi yagi was picking up big fat gaussian shaped signals at -20 > to -25dbm about 10-15mhz wide in the middle. I sent my guys to a second > location with the spectrum analyzer just to make sure they weren't > seeing local interfernce and they saw the same thing. A legal amount of > power output would cause it to come in at about -50. > > Anyone else seen such strange stuff coming from this type of ship? I've > never seen any trouble from any ship ever, though this is the first > drilling ship to visit our area. > > > -- > /* > Jason Philbrook | Midcoast Internet Solutions - Wireless and DSL > KB1IOJ | Broadband Internet Access, Dialup, and Hosting > http://f64.nu/ | for Midcoast Maine http://www.midcoast.com/ > */ > > > ---------------------------------------------------------------------------- ---- > 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/
