RADIO

Star (Christchurch), Issue 19237, 26 November 1930, Page 5

RADIO

(BY

“AERIAL.”)

AMERICAN DESIGN IS FAVOURED AT OLYMPIA. Prominence of S.G. Valves. More than 200,000 radio enthusiasts of England and the Continent witnessed one of the most elaborate displays of radio apparatus at the Olympia held in London last month. At the exhibit more than 200 manufacturers from England and throughout Europe exhibited the latest development in radio apparatus. Outstanding departures from general construction lines were in prominence, the general trend being toward the design of American-made apparatus. For the first time in the history of the Olympia the majority of the sets on display were electrically operated rather than making use of batteries. Screengrid valves, while Said to have been in u.«*» for a number of years, were in greater prominence in the 1931 model receiving sets. Single-dial tuning is another feature which gained favour. Practically all of the receivers on display had controls greatly simplified. Because of the number of different types of alternating current supplied in residences throughout England, the electric sets are furnished to operate on all frequencies of current. Fewer Valves. of screen-grid valves had virtually resulted in a decrease in the number of valves used in receiving sets. Listeners, it is pointed out, are taxed by the Government, the rate being gauged by the number of valves in the set. For this reason, th\a number of valves in the British-made receiver has been kept at a minimum. While complete receiving sets are showing a steady gain in England, there still is a large demand for component parts. It is estimated that as high as 40 per cent of the listeners still are constructing their own apparatus, and for this reason parts were in great evidence at the Olympia. A number of new types of vacuum valves were presented at the exhibit. Principally among these were valves of the heater typo similar to those used in the United States. “Consolidation.” Tn commenting on the Olympia, “The London Wireless World'* stated: “The outstanding characteristics of the show of 1930 can, we believe, be expressed in the one word, ‘consolidation.’ In previous years changes in circuits and essential apparatus, particularly in tvpes of valves, have been so frequent that the manufacturer has had little opportunity tconsolidate his own position and year it will be found that valves have improved in characteristics and have attained a high standard of reliability and consistency. Receiver circuits have been improved in detail, and sets generally have reached a higher standard of perfection and dependability.” Sand Capacity Effects. In some short-wave sets with which headphones are used there is a tendency for the tuning to alter, and for the circuit to break into oscillation, or the signals to fade right out, whenever the telephone Iteads are touched by the operator’s hands. This is due to a capacity effect resulting from radio-frequenev currents finding their wav into the audio-frequency side of the circuit. The trouble is very likely to occur through tne use of an unsuitable R.F. choke in the plate circuit of the detector valve. In this case the remedy is obvious. But if the trouble persists even when a good short-wave choke is used, it can generxV™ overcome by connecting small TUP*, chokes in series with the ’phon'd leads. A. Counter-Interference Invention. The E.I.A.R. (Italian Broadcasting company) has been experimenting with an Invention, the work of a young Genoese. Signor Bruni, for the elimina-

tion of atmospheric and electrical disturbances affecting - wireless transmissions, and has placed a transmitting station at his disposal for further Experiments. Representatives of the Navy and Army, as well as of the E.1.A.R., have been present at trials, and have expressed their satisfaction at the results achieved. The inventor. Signor Bruni, is only twenty-one years of age. TO-NIGHT’S CONCERTS. IYA, Auckland (329 Metres). 7.40: Talk, “Pottery,” Miss Briar Gardner. 8.0 to 10.1: Programme by the Auckland Training College for Teachers’ Glee and Dramatic Clubs. 2YA, Wellington. Silent day. 3YA, Christchurch. (306 Metres). 7.15: Relay of Farmers’ Dialogue from 4YA. 7.30: Addington stock market reports. 8.0: Operatic and miscellaneous programme. Featuring vocal excerpts from “ The Arcadians,” by “ The Salon Quartet”—Miss Corrie Aslin, soprano: Miss Dulcie Mitchell, contralto; Mr James Shaw, tenor; Mr .T. Graham Young, baritone. Hermann Finck's Orchestra, “ Sc-hubertiana.” 8.16: Salon Quartet, “The Joy of Life.” 8.21: Mr Young and Quartet, “ Sweet Simplicitas.” Mr Shaw, “ Back Your Fancy.” 5.26: Studio Octet, “Overture Ipiginie en Aulide.” 8.34: Miss Mitchell and Quartet, “The Girl With a Brogue.” Miss Aslin and Quartet, “ Arcady is Ever Young.” 8.39: Mr Shaw, “Somewhere.” Mr Young, “ Fickle Fortune.” Salon Duo, “Charming Weather.” 8.45: Organ, F. Roland-Tims, “ Shepherd’s Lullaby.” 8.48: Studio Octet, “Three Dances from Nell Gwynn.” 8.58: Weather forecast and station notices.” 9.0: Band, La Garde Republicaine, “ La Pere De La Victoire,” “ Sambre Et Meuse.” 0.6: Salonelle; Duo, “Plant Your Posies.” Miss Mitchell, “I Like London.” 9.11: Mr Young, “My Mother.” Miss Mitchell, “Bring Me a Rose.” 9.16: Studio Octet, Grand .Opera selections, “La Boheme.” 9.2.>: Salon Quartet, “Truth is so Beautiful”; Salona Duo, “Half Past Two.” 0.31: Studio Octet, “Largo” (Handel), “Pa vane ” (from “Etienne Marcel ”). 9.40: Mr Shaw, “The Only Girl Alive.” Miss Aslin, “Come Back to Arcady.” 0.45: Cornet, James Compton, “At Dawn,” “At Sunset.” 9.51: Mr Young, “Love Will Win.” Miss Aslin, “My Heart Flies Homing.” 9.55: Studio Octet, “Five Interludes” (from “Beggars’ Opera”). 10.1: Close. 4YA, Dunedin (461 Metres). 7.15: Talk, R. B. Tennant and L. W. M’Caskill, “ Farmer Brown discusses Ensilage-making with the Instructor.” 8.0: Band of H.M. Grenadier Guards, “Regimental March Medley.” 8.9: Baritone, Mr William Ruffell, “ Nelson’s Gone a’Sailing,” “ World That Once Was a Garden.” 8.15: Gordon's Orchestra, “ Spread a Little Happiness,” “ Song o’ My Heart.” 8.23: Talk, Mr W. B. Lambert, “Tailoring.” 8.38: Gordon’s Orchestra, “ Dear Little Irish Mother.” 5.42: Soprano, Miss A. Finnerty, “Pucker Tip and Whistle.” 5.46: Violin, Mr Len Boath, “ Skandlnavische Romanze.” 8.50: Boy soprano, Master Leslie A. Coombs, “Trooper Johnny Ludlow.” 8.53: Gordon’s Orchestra, "A House on a Hilltop,” “Every Little Moment.” 9.0: Weather report. 9.2: Mr Ruffell, “For the Green.” 95Banjo, .Mr H. Stokes. “Ole South.” Gordon’s Orchestra, “Tell It To The Daisies” 0.15: Miss Finnerty, “Sing a Little Love Song," “When Irish Eyes Are Smiling.” 9.21: Gordon’s Orchestra, “ Yank-o-Mania.” 9.24: Master Bor,mbs, “Cloud Shadow,” “The Cuckoo Block.” 9.30: Dance session:—Foxtrots, “Around tho Corner,” “You Can’t Be Unhappy,” “Santiago,” “Minnie’s YooHoo!” 9.42: Waltz, “Eleanor.” Foxtrots, “Just Like in a Story Book,” “ Bridge of Our Dreams Come True.” 0.51: Sweet and Low Duettists, “By the Waters of Killarney.” 9.54: Foxtrots, “Cooking Breakfast.” “Leave It That Way,” “Kickin' a Hole in the Sky,” “The Whole Darned Thing’s.” 10.6: Waltz, “ Lazy Lou’siana Moon.” Foxtrots, “ Into My Heart,” “High Societv Blues.’ 10.15: Vocal, Cavan O’Connor, “The Sunshine of Marseilles.” 10. IS: Foxtrots, “The Free and Easy.” “Pale Blue Waters.” “The Toy Farm-Yard,” “Livin’ in the Sunlight.” 10.30: Waltz, “ I Feel You Near Me.” Foxtrots “It Must Be You,” “With My Guitar and 1011, “You Brought a New,” “A Pair of Blue Eyes.” 10.45: Sweet and Low Duettists, “ Just an Old Refrain.” 10.48: Foxtrots. “I’m in the Market,” “Johnnie,” “ Figaro,” “A Lone Girl Flyer.” 11.0: Close.