Oscillating Valves

Radio Record, Volume III, Issue 25, 3 January 1930, Page 7

Oscillating Valves

---_ Creating Annoyance PPROPOS our article in a recent issue of the "Radio Record’ concerning the howling valve nuisance, we have received a complaint which runs :- In view of the disturbance created by an oseilating receiver, I cannot understand why the "Radio Record" should publish diagrams of a three-coil regenerative receiver. This is distinctly unfair, and shows lack of technical knowledge on _ the part of the writer. It is not only the home-constructed receivers that create annoyance. In fact, a properly neutralised home-built receiver can cause far less annoyance than a_ factorymade receiver which has had a new set of valves for which it is. not sutralised. . ,; ‘We know of two owners of ~owning-Drakes who live almost side side, andthe only disturbance ereated by ‘either receiver is the very. faintest ‘breathing noise. A three-coil ‘peceiver carinot create a noise in the neighbourhood if it is correctly -balanced and carefully handled, The whole trouble is that many of these receivers are not balanced properly, and, of eourse, create disturbance. ‘.(Phen* there is the enthusiast who . alters -his neutralising condenser to obtain greater sensitivity, with the result that his neighbours know of his experiments. A broken down by-pass . condenser in the radio frequency stages. of a neutrodyne will likewise create trouble, All the sets described in the "Radio Record" need annoy nobody, although a warning is always issued when there is the slightest possibility of the set becoming a nuisance to the neighbourhood. |