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Allan Healy allan.healy121 at gmail.comYeah that’s true. I am thinking if I could get the Automatic Gain Control of the transmission from the plane I might be able to give a really rough guesstimate where the plane is in a 2D axis. On 17 Feb 2014, at 16:22, Stefan Sydow <st at metafly.info> wrote: > Hi, > > as far as I know interrogation requests are send on 1030MHz with a > higher bandwidth and a different modulation scheme. > > Stefan > > Am 17.02.2014 17:11, schrieb Sylvain AZARIAN: >> Hi , >> >> just one comment : the interrogation is periodic and stable.. the request >> is transmitted by a rotating antenna turning at constant speed. If you can >> get the direct path to the interrogation system, you may estimate the >> round-trip time and then when the interrogation pulse is sent >> >> sylvain >> > >