scope:

In this section selected methods of measurement are described which are applicable to the electrical characteristics of terrestrial radio-relay transmitters of the heterodyne type excluding any r.f. branching and switching networks. Local oscillator noise, although an important parameter of a transmitter, is not usually measured on the transmitter itself, but rather between terminals in the radio-relay system. This parameter, which results in path-loss-independent baseband noise, is not therefore considered in this section.