AM receivers

Discussion in 'General Electronics Chat' started by mikeonthegreen, Jan 28, 2007.

  1. mikeonthegreen

    Thread Starter Member

    Jan 7, 2007
    I am currently taking a Communications class. A friend asked an interesting question to me. She had two radios on in the house, both tuned to the same AM station. She went from one room to the other and noticed a delay between the two radios. It stayed like this until she left for work 20 minutes later. It has only happened once. Any thoughts as to what would cause this?
  2. beenthere

    Retired Moderator

    Apr 20, 2004

    Probably from the speed of sound delay between on speaker and the other. The AM sigmal, propagating at the speed of light, isn't likely to be measurably delayed between receivers.
  3. mrmeval

    AAC Fanatic!

    Jun 30, 2006
    AM bounces a lot, there could have been a large vehicle or plane in the area. If it was that pronounced it may have been a plane.
  4. Gadget

    Distinguished Member

    Jan 10, 2006
    Are you 100% sure they were the same station on the same frequency, and not the same station on different frequencies.... I.E one frequency = station direct, and the other is same station via a link.
    That would explain the delay nicely.
  5. harsha4143

    New Member

    Jan 17, 2007
    hey.. i took a couple communication classes.. and I think the reason is.. it is very unlikely that a radio receives a direct signal... the signal received is either reflected, deflected etc from an object.. like buildings, vehicles etc...the distance traveled by both the signals is not the same.. and hence one radio may receive a signal a little later than the other...
  6. mikeonthegreen

    Thread Starter Member

    Jan 7, 2007
    She is an older lady who only knows AM and is scared of the new technology called FM. So to answer your question yes same frequncy.
  7. mikeonthegreen

    Thread Starter Member

    Jan 7, 2007
    That makes sense. Thanks for the info.