Matched resistor connected to a cable

Discussion in 'General Electronics Chat' started by unseensoul, Jan 9, 2010.

  1. unseensoul

    Thread Starter Member

    Dec 13, 2008
    "If you connect a matched resistor to a lossy transmission line (i.e. coaxial cable) and measure the noise at the end of the transmission line you obtain a noise power of kTB."

    Why is that? Why do you get kTB noise power at the end of the cable if the resistor's noise power transmitted into the cable is of the same magnitude? What assumptions are made?