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| Number | Title | Issue Date |
| 4656440 | Single-sideband modulator and broadcast transmitter A broadcast transmitter with single-sideband modulation for transmitting a message with a band width and carrier power which is lower in comparison with double-sideband modulation. To be able to operate a high-power single-sideband transmitter with only o... | 04/07/1987 |
| 4449103 | High power class B modulation amplifier for a broadcast transmitter A method for amplifying electric signals, an amplifier circuit and application of this amplifier circuit as the modulator stage of a subsequent amplifier, employing a variable anode voltage for the purpose of improving the efficiency of amplifiers and par... | 05/15/1984 |
| 4350962 | R.F. switched amplifier and A.M. modulator An amplifier circuit incorporating a valve or vacuum tube in the grounded grid configuration is disclosed. The anode D.C. potential is greater than the cathode D.C. potential which is in turn greater than the grid D.C. potential. The cathode is switched a... | 09/21/1982 |
| 4272737 | Pulse width modulator for amplitude modulation circuit A pulse width modulation circuit which uses a tube, such as a tetrode tube as the switching element, is arranged to minimise excessive power dissipation in the screen electrode circuit of the tube. The screen electrode is driven from a constant current so... | 06/09/1981 |
