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Discussion in 'Electronic Design' started by Adam, Feb 9, 2007.

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  1. Joerg

    Joerg Guest

    What has become of it? I remember that once upon a time almost all US
    made rental cars had AM-Stereo receivers. Lately my rentals were all
    Japanese and none of them had it. IIRC even a Saturn L300 I rented a
    couple years ago didn't. The home stereo we bought about five years ago
    doesn't either. AFAIR it was designed by the US company SonicBlue. It
    has all the other bells and whistles so AM-Stereo must have been pretty
    low on the feature pecking order. Or is it gone already?
     

  2. Every station around here pulled the plug years ago. Minor problems
    with the transmitter caused it to act up, but still allowed them to
    operate in mono with no problems. Budgets are tight, so when they got
    few, or no complaints, they didn't bother to turn the encoders back on.

    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  3. joseph2k

    joseph2k Guest

    I was giving a descriptive explanation of what i meant, not a recommended
    implementation. The recommended implementation does not use DFTs, and is a
    FIR implementation.
     
  4. krw

    krw Guest

    Encoders? I thought stereo AM required a second transmitter for
    L-R.
     
  5. joseph2k

    joseph2k Guest

    C-QAM, all on the original carrier.
     

  6. That is for HDTV, one for the analog channel, and one for the digital
    channel. ;-)


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  7. krw

    krw Guest

    Seriously, I remember when WLS-AM (Chicago) went stereo. They were
    talking about how they had to reduce the power from one transmitter
    when they brought the second on-line. There were other issues as
    well, but it's been a long time though.
     
  8. Ian

    Ian Guest

    In case the OP (or others) are interested, I happened to come across
    an article with the original phase quadrature network in it (I posted a
    scan of the relevant page in a.b.s.e) in a tutorial article in Elektor in
    1977.

    The unusually wide bandwidth of 30Hz to 16kHz is because this
    network is designed to provide the quadrature for an Ambisonic
    surround sound coder/decoder rather than SSB.

    Performance appears to be pretty good for the number of opamps used.

    Regards
    Ian
     

  9. They may have had to reduce power because the transmitter couldn't
    meet specs in stereo mode when they ran it at full power. Some
    transmitters generated serious amounts of spurs and harmonics when
    converted to stereo. A lot of AM stations have a second, or even third
    transmitter for day/ night power levels, and emergency operations. Its
    cheaper to use a timer to switch transmitters than to keep a full time
    engineer at the station to make the adjustments when the power and
    antenna patterns change for night time service.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
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