THE RADIO WORLD

Hawke's Bay Tribune, Volume XVII, 7 December 1927, Page 9

THE RADIO WORLD

SOME PRACTICAL OBSERVATIONS. A recent severe local thunderstorm interfered seriously with 3YA’s afternoon relay of a cricket match, writes “Proton” in the Lyttelton “Times.” At least one radio enthusiast who takes a scientific interest in his set took the opportunity of making some practical observations. Mr. Joyce sends me the following interesting data, X, signifies a burst of static and its duration in seconds. C, the “kick” of the plate milliameter in milliamps. L, lightning reported at Christchurch. I, lightning observed at Kaiapoi. LL or 11, double flash. Time Meteorological Receiver

The general correlation of static crashes with lightning is, of course, quite obvious. It would be a better correlation if in each case we had milliammeter deflections and distances of flashes. The latter can be arrived at by allowing 4.8 seconds per mile for the time between lightning and thunder. Probably such an observation would require two observers. A USEFUL SAFETY VALVE. Those who are bothered by the thunderous crashes of nearby and powerful signals will find some degree of relief through-the simple expedient ot inserting a variable high resistance between antenna and ground binding posts of the receiving set, thus by-passing the nearby or high voltage signals more or less to the ground, according to tile resistance setting, and bringing the signal strength down to witlnn the limitations ot the receiver. When the usual signals are tuned in, the weaker signals, having less voltage, are not by-passed so readily through the high resistance, it is claimed, and therefore retain most of their power. This is not a wave trap or tuning scheme, it will be noted, but just a sort of safety valve to prevent the roof from being blown on the house when extra loud signals are being received.

LIGHT AND CRYSTAL DETECTORS. i The effect of light on crystal detectors is very curious, though not more so than the characteristic detecting action of the crystal itself, which has never been satisfactorily explained. Most crystals will work better if strong light, such as sunlight focussed by means of a lens, be allowed to fall upon them. The light from a tungsten lamp may similarly be used. Galena behaves in this way, and so do most samples ( of pyrites. Carborundum and telurium mixtures, on the other hand, do not seem to be affected by light. There is here a very interesting held for experiment by the enthusiastic amateur. MR MARCUSE TO BROADCAST. Advice has been received that Mr. G. Marcuse will in future be transmitting on a wave length of 32.5 meters on Sunday and Tuesday mornings at 6 o’clock, and on Sunday evenings between 6 and 8 o’clock, Greenwich mean time, PROGRAMMES FOR TO-NIGHT. IYA, Auckland, —6 p.m Children's hour. 7.15: Talk on “Physical Culture,” by Mr. Norman Kerr. 7.30: News and reports. 8.0; Chimes. March—Auckland Artillery Baud, under the direction of Mr. E. Tregilgas, “Simplicity” (Ord Hume). Overture—“lf I Were King” (Adams). Baritone—Mr. J, Bree, “Wind on tbe Heath” (Lohr). Selection—The Band, “Der Freischutz’’ (Weber). Suite— The Band, “Scenes in Maoriland” (Potatau). Soprano solo—Miss L. Walker, “Mother, You Know the Story” from “Savalleria Rusticana” (Mascagni). Cornet duo—Messrs Davis and Shepley, “Ida and Dot” (Losey). Weather forecast. .Descriptive selection—The Band “Abyssinian Expedition” (Pridham). Talk—Mr. R. G. Sellar “The Mutiny of the Bounty.” Baritone solos—Mr. J. Bree. (a) “The Ringers” (Lohr); (b) “Had I But Known” (Nicholls). Selection—The Band. “Maid of the Mountains” (Frazer-Simpson), So■'■■■mo solos—Miss Laura Walker, (a) “Devotion” (Schumann); (b) “Hapny Song” (Del Riego). Selection-The Band, excerpts from “The Gondoliers” (Sullivan). March—The Band, “The Mnff Major” (Alford).

2YA, Wellington,—Silent Day. 3YA. Christchurch.—6 p.m. Children’s hour—Uncle Peter and Mother Hubbard. 7.15: Addington stock market report. 7.30: News. 8.O: Chimes. Relay of orchestral selections from Grand Picture Theatre Orchestra, under the direction of Mrs Black. Tenor solo—Mr, W. Bradshaw. “For You Alone” (Geehl). Recital and musical monologue—Miss Olive Braisher, (a) “Matilda” from “Cautionary Tales’’ (Bellos); (b) “Having ft Out” (M.S.) Contralto solos—Miss Nellie Lowe, (a) “Angus MacDonald” (Roeckel); (l>) “Husheen” (Needham). Zither banjo solos -Mr. Jack Oxley, (a) “The More We Are Together” (Connolly); (b; “Ukulele Dream Girl” (Low). Tenor solo—Mr. W. Bradshaw, “Drink To Mo Onlv With Thine Eves” (Old English). Recital -Miss Olive (Braisbcr, “At the Seaside” (M.S.). Contralto solo—Miss Nellie Lowe, “O. Lovely NiMit” (Ronald). Zither banjo solos- Mr. .Tael.- Oxlev. (a) “Sunflower Dance” rOssmnn): (h) “Schaeffer’s Burn Dance” (Schaeffer) Relay from Chi istehnich Orchestra!

Society’s concert. Tenor solo—Mr. W. Bradshaw, “Tom Bowling” (Dibdin). God Save the King. 4YA. Dunedin.—Silent day, 2BL, Sydney.—Broadcasters Topical Chorus, Miss Heather Kinnaird (contralto songs). Mr. Googs Hanlon (novelty jazz pianist). Mr. Douglas Graham (Scottish comedian). The Canterbury District Band (Stan. Nicholls). Broadcast from Baker's Hall Campsie, Mr. Norman Wright (tenor songs) ■ 3LO, Melbourne.—7.ls p.m.: Mr. R. Crowe will speak on “Marketing Methods”; Mr. P. W. Pearce on “The Importance of Good Posture”; Captain C. H. Peters on “Books.” Artists; Marion Lightfoot. Anna Burke, Syd Fayne, Maggie Foster. A programme of English music (arranged by Mary Campbell of the Albert Street Conservatonum). The Railway Military Band, Joe Aronson and his Synco-symphonists. 4QG, Brisbane.—B p.m.The first portion of .to-night’s programme Alli be provided by the Silkstone Apollo Club (conductor. Mr T. Westwood), and the second portion by the Sleath Trio from the studio.

p.m. observations. observations. 4.11.20 X 07 11.59 L X 07 13.10 X CIO 14.50 L X 09 15.10 L Xli C9 16.25 Xi C9 17.55 Xi c? 18.5 Xi C9 20.5 Xi CD 22.5 X 23.53 I Xi 24.20 XI 25.25 Xi 26.50 I 28.0 X 32.0 I 4 miles X 35.5 JI 4 miles XX 44.35 II XX 45.37 X 47.40 I X 5. 0.5 I X