A New System of Short Wave Amplification

The various possible known methods of amplifying incoming signals of very short wave length (below 600 meters) are described and their limitations considered. The new method then described consists (for continuous wave reception) of the following steps:- 1. Heterodyning, with the production of a beat frequency which is itself a radio frequency (for example, 100,000 cycles per second). 2. Rectification of the beat current. 3. Amplification at the beat radio frequency, preferably by a tuned amplifier. 4. Audio frequency modulation of the amplified current. 5. Rectification of the modulated current. For reception of damped wave or radiophone signals, step 4 is omitted. It is shown that in this case the quality (characteristic tone) of the incoming signals is preserved.