Notes on the Frequency Test

Radio Record, Volume II, Issue 6, 24 August 1928, Page 28

Notes on the Frequency Test

N the past two issues the writer has pointed out in a generdl way how constructors may get upon the track of lost tones, high or low, in their receivers. At the same time, one or two other matters connected with good reproduction ,were mentioned because they are the subject of many inquiries py correspondence. Quality reproduction is what we are all striving after, and whilst improvements are being made with a special object in view, very frequently improvements can be made simultaneously in another direction. Special note should be made of the fact that the loudspeaker is not always to blame, and before it is changed the receiver itself should come under careful scrutiny. As a rule, the chief causes of lost or under-amplified notes will pe found in the audio system, including sometimes the speaker.

Judgment of quality and tone depends very much upon one’s musical ear, so that there is room for very wide divergence of opinion between two persons, apart from individual preference for. certain types of music. Very fine reproduction is possible, but not always easy of attainment. Nevertheless it should be the aim of every constructor to continually alter and improve the receiver with a view to approaching nearer the goal. Judge earefully the sound of music and speech delivered by the _ loudspeaker. Is it free from "wooliness," tinny, or raspy tone, and are all frequencies from the highest violin and cornet notes to the deep notes of the pipe-organ naturally and pleasingly reprodueed? Hearing reproduction from other receivers, that is, good ones, is a help as hearing a receiver with a tone and range better than one’s own, at once supplies a standard to aim at for the meanwhile, and the higher that standard the better. Ielpful hints on the subject will be continually published, and at an early date it is hoped that particulars will be published of a high quality amplifier.