of noise in signalprocessing. In communication systems, noise is an error or undesired random disturbance of a useful information signal in a communication
attenuator to vary the signal’s output power. Depending on the manufacturer and model, output powers can range from −135 to +30 dBm. A wide range of output
{\displaystyle TSS(dBm)=114+10.logF_{T}+10\log {\Big (}6.31B_{V}=2.5{\sqrt {2.B_{V}B_{R}-B_{V}^{2}}}{\Big )}} From this, the S:N of the RF signal, at the input
single TV signal at the receiver terminals is about 0 dBmV. Cable TV uses 75 Ω coaxial cable, so 0 dBmV corresponds to −78.75 dBW (−48.75 dBm) or approximately