R&D Report 1956-22 : Power measurement in the frequency range 30-1000 Mc/s. G.H. Millard, R.H. Minns, G.D. Monteath Laboratory equipment has been developed for measuring power over a wide range of levels in the frequency range 30-1000 Mc/s. A milliwatt meter using thermistors measures powers between 1 and 20 mW directly, and its use is extended to higher powers by means of dissipative attenuators and directional couplers. Each item of the equipment is fitted with connectors, suitable for use with 71-ohm coaxial cable. The report also describes a power monitor fitted to v.h.f./u.h.f. transmitters.