INTRODUCTION The TF 2008 is a wide range f. m./a.m. signal generator with the full 10 kHz to 510 MHz frequency range covered in eleven switch selected ranges and is particularly useful for checking wide and narrow deviation radio links and broadcasting systems. It uses solid state active circuit elements in order to utilize new mechanical and electrical arrangements. Particular attention has been paid to grouping controls together for ease of operation whilst the circuits are designed for complete independence of individual controls. Precise automatic level control circuits render the provision of a set carrier control unnecessary. A single master oscillator unit is used to cover the entire frequency band of the generator allowing particularly high stability. A unique feature is the use of a single dial, continuously variable output attenuator for levels from 0. 2 |j.V up to 200 mV e. m. f.; an alternative version is available with the output expressed in terms of p. d. in 50 Q, i. e. 0.1 p.V up to 100 mV. In addition to being a high precision wide range signal generator, TF 2008 also operates as a versatile sweeper.