Radio Reception

Radio Record, Volume III, Issue 26, 10 January 1930, Page 31

Radio Reception

‘ A. New System GROUP of. business men and scientists in New York recently witnessed ‘a* demonstration by Dr. Alger 8. Riggs of a system of radio reception which he claims is entirely new. Dr. Riggs declares that special valves he,. has developed, when used in his special circuits, give even. better than normal’ radio reception without making use.of many features hitherto thought indispensable. _. All the valves in the radio-frequency and audio: amplifier ‘stages of -the circuit, he Says, work. with a_ positive bias. There is no grid-leak nor grid condenser,:and the radio-frequency stages are: aperiodic-they work without ‘the aid of tuning coils and tuning condensers. . Condensers and tuning coils are used. -in the. set, however, in a pre-selector circuit through which the inconting broadcast signals must pass before they reach the radio-fre-quency amplifier stages of ‘the receiver, Another improvement claimed by Dr. Riggs is a true "threshold" detector arrangement, which,: he says, makes it possible to exclude completely static or other’ electrical: interference, provided the signal strength. is sufficiently great as compared with the undesirable: "noise,