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Homework Help: Min carrier frequency in Amp Mod.

  1. Jun 30, 2013 #1
    1. The problem statement, all variables and given/known data

    Given a DSB -SC system, with a message limited to B Hz, what is the minimum usable value of ωc or f0 (carrier frequency)

    2. Relevant equations

    Nyquist theory? Not sure how to apply.

    3. The attempt at a solution

    Only attempt has been through research.
  2. jcsd
  3. Jun 30, 2013 #2


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    Staff: Mentor

    Hint: we don't want any sideband frequency of 0Hz or less.
  4. Jun 30, 2013 #3
    What does this have to do with sidebands? A sideband could only have a bandwidth of 0Hz or less if Wc was actually less than Wm, no? I applied the nyquist theory (sampling) to this, and concluded that the carrier frequency must be at least twice that of the message frequency. Not sure if this is right though.
  5. Jul 1, 2013 #4

    rude man

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    Homework Helper
    Gold Member

    You're getting very warm.

    BTW the lower sideband does not "have a bandwidth". It's assumed to be a spot frequency with zero bandwidth.
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