Wellington Radio Society

Radio Record, Volume III, Issue 19, 22 November 1929, Page 8

Wellington Radio Society

Monthly Meeting THE Amateur Radio.Society of Wellington held its monthly meeting in the Cambridge Terrace Congregational Church schoolroom on Tuesday evening, November 12. The president, Mr. Byron Brown, being absent on a visit to Australia, the chair was.taken by Mr. I. M. Levy, vice-president. A lady member: reported serious electrical interference from. a source in proximity to Daniell Street, Newtown. She stated that-the interference was almost continuous niglit and day, and spoilt broadcast reception. A motion was carried. instructing the honorary secretary to notify officially the district radio-inspector of the complaint. Another member complained of similar interference, although intermittent, at Miramar, . The subject of the annoyance occasioned by howling valves was much discussed, and it was explained by a member. of the trade that the ‘P. and T. Department very rigidly tested ail types of sets on the market in order to prevent. the sale of any set likely to cause. intefference with broadcast listening. He offered the opinion that the trouble from howling valves was mostly | due to home-built sets. The advance of the a.c. type of set in popularity, however, was steadily reducing the howling valve nuisance, and in time would almost entirely eliminate the trouble. Members reported a somewhat persistent nuisance caused in the Lyall Bay area by a howling valve, which was almost continuous each evening. A member who resided at Miramar added that the howling valve was probably the same whieh annoyed listeners in that area. A suggestion was made that the matter should receive attention from the district radio inspector. It was decided to congratulate the New Zealand Association of Radio Transmitters on the reduction of the license fee for transmitting stations from £2 2s, to £1 10s.

N instructive and interesting lecture on methods of testing loudspeakers in the laboratories of manufacturers was delivered by Mr. C. Liddell, a member, of the New Zealand Association of Radio Transmitters. Mr. Liddell, who illustrated his remarks with graphs prepared by himself, said that very little real research had been done on the subject. It was a difficult’ problem to ascertain the amount of energy imparted to the air on various frequencies’ from a loudspeaker, but he described by diagrams the Phonodeik Raleigh Dise and other ingenious and successful methods. Many difficulties had to be overcome in. obtaining a fairly even distribution of volume throughout the gamut by a loudspeaker, and these were dealt with in detail.