| 摘要 |
876,836. Space charge wave tubes. ENGLISH ELECTRIC VALVE CO. Ltd. Feb. 18, 1960 [Aug. 19, 1959], No. 28334/59. Drawings to Specification. Class 39(1). In a parametric amplifier or frequency converter there is, in order from the gun, an input electrode system, a four start helix and an output system. It is stated that the four start helix functions as a pump by applying alternatively positive and negative D.C. potentials to the helices to give a quadrupole field, no A.C. potentials being applied. The helices may be of wire. In the frequency converter the collector is a disc electrode surrounded by an annulus connected to the'output circuit tuned to the sum or difference frequency or any collector described in Specification 860,058 may be used. An axial magnetic field is provided. |
