An RF (radio frequency) power metering system comprising: a channel-selective RF power sensor and a channel power meter; said channel-selective RF power sensor comprising a coupler and a channel-selective power measurement circuit; said coupler is configured to obtain a sample of energy travelling on a main transmission line and provide said sample of energy to said channel-selective power measurement circuit, wherein said sample of energy containing a channel of interest; said channel-selective power measurement circuit has a tuneable receiver with a local oscillator, an in-phase mixer and quadrature mixer configured to select said channel of interest in said sample of energy, wherein a center frequency and a bandwidth of said channel of interest are user selectable; said channel-selective power measurement circuit has an in-phase bandpass filter and a quadrature bandpass filter configured for rejecting frequencies in said sample of energy that are outside of said bandwidth of said channel of interest; said receiver is configured to down-convert said sample of energy to baseband or a low intermediate frequency; and said channel-selective power measurement circuit is configured to measure RF energy information for said channel of interest in said sample of energy, wherein said power metering system is configured to measure RF energy information of an RF transmission system and/or an RF receive system using said channel-selective RF power sensor and the channel power meter that is configured to receive RF energy information from said channel-selective RF power sensor. a channel-selective RF power sensor and a channel power meter; said channel-selective RF power sensor comprising a coupler and a channel-selective power measurement circuit; said coupler is configured to obtain a sample of energy travelling on a main transmission line and provide said sample of energy to said channel-selective power measurement circuit, wherein said sample of energy containing a channel of interest; said channel-selective power measurement circuit has a tuneable receiver with a local oscillator, an in-phase mixer and quadrature mixer configured to select said channel of interest in said sample of energy, wherein a center frequency and a bandwidth of said channel of interest are user selectable; said channel-selective power measurement circuit has an in-phase bandpass filter and a quadrature bandpass filter configured for rejecting frequencies in said sample of energy that are outside of said bandwidth of said channel of interest; said receiver is configured to down-convert said sample of energy to baseband or a low intermediate frequency; and said channel-selective power measurement circuit is configured to measure RF energy information for said channel of interest in said sample of energy, said coupler is configured to obtain a sample of energy travelling on a main transmission line and provide said sample of energy to said channel-selective power measurement circuit, wherein said sample of energy containing a channel of interest; said channel-selective power measurement circuit has a tuneable receiver with a local oscillator, an in-phase mixer and quadrature mixer configured to select said channel of interest in said sample of energy, wherein a center frequency and a bandwidth of said channel of interest are user selectable; said channel-selective power measurement circuit has an in-phase bandpass filter and a quadrature bandpass filter configured for rejecting frequencies in said sample of energy that are outside of said bandwidth of said channel of interest; said receiver is configured to down-convert said sample of energy to baseband or a low intermediate frequency; and said channel-selective power measurement circuit is configured to measure RF energy information for said channel of interest in said sample of energy, wherein said power metering system is configured to measure RF energy information of an RF transmission system and/or an RF receive system using said channel-selective RF power sensor and the channel power meter that is configured to receive RF energy information from said channel-selective RF power sensor.