| 摘要 |
700,849. Superheterodyne circuits. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Oct. 10, 1952 [Oct. 13, 1951], No. 25432/52. Class 40 (5) In a frequency-changing circuit utilizing a multigrid valve in which signals are applied to one grid and local oscillations to another, in switching to an ultra-high frequency range a resistance 10 is switched in parallel with the grid condenser 4. In this way excessive self-bias, due to grid rectification of local oscillations transferred to the signal grid at these frequencies, via the internal valve capacities, is prevented. |
