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Homework Help: Carrier-to-Noise Ratio Question

  1. Jun 29, 2011 #1
    1. The problem statement, all variables and given/known data
    A receiving system consists of an antenna with an effective noise temperature of
    70 K. This antenna is connected to a microwave front end of noise figure 7 dB
    via a feeder. The feeder’s specific attenuation function is 0.2 dB/10m. The actual
    feeder length is 2 m. Calculate the carrier to noise power spectral density at the
    output of the microwave front end if the received carrier power at the antenna
    terminals is -100 dBm?

    2. Relevant equations
    I'm assuming it as Cmin = -174 + NF + 10Log10B + C/N

    NF = Noise Figure,
    B = Bandwidth, and C/N is a Carrier-to-Noise Ratio which is asked?

    3. The attempt at a solution
    Cmin = -110 dBm
    Noise Figure (NF) = 7 dB & Struck up in knowing Bandwidth (B)

    length of feeder is 2 meters,
    feeder’s specific attenuation function is 0.2 dB/10m, What Next???
  2. jcsd
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