regarding DDR

Discussion in 'General Electronics Chat' started by elisettynarendra, Oct 31, 2010.

  1. elisettynarendra

    Thread Starter Member

    May 17, 2010
    42
    1
    while i was reading about ILS (instrument landing system ) i got a term called DDR (difference in depth of modulation)..how can an antenna transmitting a signal at the same time can produce signals with difference in depth of modulation..

    Instrument landing system ground stations provide radio frequency signals that vary linearly in the depth of modulation from the centre or course line at a rate of 0.145% per metre


    these are the lines i got from wikipedia
    if i am right ..according to what i understood ..the 'depth of modulation ' varies along the beamwidth..
    how can we do this with a single antenna transmitting signals at ' DDR '.
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
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