H03G3/00—Gain control in amplifiers or frequency changers
H03G3/20—Automatic control
H03G3/22—Automatic control in amplifiers having discharge tubes
H03G3/225—Automatic control in amplifiers having discharge tubes controlling or controlled by the (local) oscillators of a (super)heterodyne receiver
B—PERFORMING OPERATIONS; TRANSPORTING
B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
