WIRELESS FOR BEGINNERS.

Star (Christchurch), Issue 18961, 7 January 1930, Page 6

WIRELESS FOR BEGINNERS.

NO. 85. Returning to our contemplation of the spark, its want of effect on the ’phones when coupled alone across an inductance and the “ valve ” trap-door mentioned in article 84: Suppose we insert a trap-door in the aerial-earth-inductance-'phones circuit in such a way that it will “ trap ” the to and fro currents in the circuit induced therein by the spark transmitter. Let’s consider it. Such a trap (or valve—same thing) might let the surging electrons one way into the ’phones but not the other way. What then? Each pulsation—each burst—one way would send a kick through the ’phones, resulting in the coils and the magnets therein (see article 83) exercising a pull on the diaphragm. The return burst fails to arrive. The valve trapped it. The next burst arrives and adds to the pull and so on—the reverse burst never arriving, with the result that all the one way bursts add up in one long pull to the ’phone diaphragm. The bursts cease—the spark is not in action. Result: The ’phone diaphragm returns (springs back) to its normal position. What has happened is that our trap —our valve—has “ rectified the high frequency ” and it has moved the ’phone diaphragm in each ’phone unit of the head-set. With the trap inserted, every time the spark takes place at the transmitter the ’phone diaphragm (thanks i to the trap) sends a little pressure wave out into the air, thus becoming Sudible to your ear. If the spark occurs say 1000 times a second, little pressure waves are sent out by the diaphragms 1000 times a second. Don’t forget, however, that all this time the wireless frequency if of the order of a million times a second. Different spark stations (now obsolete except in the case of a few ships and commercial stations) have different spark frequencies, by which operator-listen-ers were able to distinguish them not only by their call signs (“ 3YA, Christchurch ” is the local station’s “ call sign”) but also by their “notes”— the note you hear in the head-’phones. (To be continued.) TO-DAY’S PKO&EAIOCES. Following are details of to-day’s programmes to be broadcast by New Zealand stations and 4QG, Brisbane:— IYA, Auckland <333 Metres). 3.0: Afternoon session. 5.0: Children’s session. 6.0: Dinner session. 7.0: News session and market reports. 8.1: IYA Orchestral Octet, “Pique Dame.’’ S. 10: Vocal trio—Olympian Trio, “O Memory.” 5.15: Contralto—Miss Martha Williamson, ‘'Songs My Mother Sang.” 8.19: Pianoforte—Miss Theo Halpin, "La Paus Que Lente” (Debussy). 8.24: Tenor—Mr Lambert Harvey, “Where’er You Walk.” 8.28: XYA Orchestral Octet, “Finlandia.” 8.37: Soprano—Miss .Dorothy Youd, "Here’s to Love." 8.41: IYA Orchestral Octet, “Ideal Aida,” “Faust Frivolities.” 8.49: Contralto—Miss Martha Williamson, “Invitation.” 8.53: Olympian Trio, “The Gipsy Laughing Chorus.” 8.57: Weather report. 8.58: IYA Orchestral Octet, “Talisman Waltz.” 9.7: Tenor— Mr Lambert Harvey, “Eily Mavourneen.” 9.11: Pianoforte—Miss T. Halpin, “Concert Etude.” 9.17: Soprano—Miss L>. Youd, “It is not Because Your Heart is Mine.” 9.21: IYA Orchestral Octet, “On With the Dance.” 9.30: Gramophone Lec-ture-Recital, Mr Karl Atkinson, “Gems from ‘Otello.’” 10.0: Close down. 2YA, Wellington <416 Metres). 3.0: Chimes, gramophone items. 5.0: Children's session. 6.0: Dinner session: Reginald King’s Orchestra, “Garden in the Rain,” “The Song I Lovel” International Concert Orchestra, “Gold and Silver.” Victor Olof Sextet, “Cherry Ripe.” 6.15: International Concert Orchestra, “The Spanish Dancer.” Victor Concert Orchestra, “Romance.” Violin—lsolde Menges, “Salu d’Amour.” 6.30: Piccadilly Orchestra, “Friend o’ Mine,” “None but the Weary Heart.” International Concert Orchestra, “My Treasure.” Victor Olof Sextet, “Minuet” (Boccherini). 6.45: Jack Hylton’s Orchestra, “Melodious Memories.” International Novelty Orchestra, “Emperor.” 7.0: News session. 7.40: Lecturette, “For the Man on the Land.” 8.0: 2YA Salon Orchestra, “Chal Romano.” 8.9: Soprano—Miss Esme Crow, “The Flower,” “Here’s to Love.” 8.6: Baritone—Mr Claude Moss, “For the Green.” 8.20: 2YA Salon Orchestra, “Ballet Suite.” 8.28: Humour— Mr Harry Painter, "After the Accident.” 8.34: Popular song—Mrs Eileen Miller, “Baby's Blue,” “Blossoms.” 8.41: Instrumental trio—Messrs W. Haydock, S. Chapman, and M. T. Dixon, “Nina,” “Syncopation.” 8.48: Soprano-—Miss Esme Crow, “Door of Her Dreams.” 8.52: 2YA Salon Orchestra, request number. 9.0: Weather report. 9.2: Baritone—Mr Claude Moss, “Nelson’s Gone A-Sailing.” 9.6: Humour—Mr Harry Painter, “The Blackest Man I Know,” “Some Observations on Spring Cleaning.” 9.13: 2Y A Salon Orchestra, “Waltz Ballet,” “Venetian Love Dance.” 9.21: Popular song— Mrs Eileen Miller, “Tune in on Happiness.” 9.25: 2YA Salon Orchestra, “Molloy’s Songs.” 9.30: Dance programme: “Let’s Sit and Talk about You,” “In a Great Big Way,” “I’m Thirsty for Kisses, Hungry for Love,” “A Little Town Called Home, Sweet Home.” 9.43: Wurlitzer organ—Eddie Dunstedter, “Parade of the Wooden Soldiers,” “Ah, Sweet Mystery of Life.” Waltz—“ Giovanna.” Fox-trots —“Yo Te Amo Means I Love You.” “The Monte Carlo Song,” “I TJ ge d to Love Her in the Moonlight,” “Step by Step, Mile by Mile.” Waltz—“ Lady Divine.” 10.13: Vernon Rickard with Hatch’s MelodyMakers, “One Golden Hour with You.” Fox-trots—“ True Blue,” “Down Among the Sugar-Cane,” “Because I Know You’re Mine.” Waltz—“ Why Don’t You Love Me?” 10.30: Male chorus—- “ Sweet and Low.” Soprano—Elisabeth Rethberg, “By a Lonely Forest Pathway.” Fox-trots—“ Deep Night,” “Wedding Bells.” 10.42: Organ with trumpet and drum —Lew White, “Sweethearts on Parade,” and “My Tonia.” Vocal “Old Kentucky Cabin,” “Blue Lagoon.” Waltz—“ Coquette.” Fox-trot—“ Till We Meet.” 11.0: Close down. 3YA, Christchurch. Silent day. 3ZC, Christchurch <250 Metres). 2.30 to 4.30: Afternoon concert session, including: “Venetia ” American Concert Orchestra; “Dost thou Know that Sweet Land?” Marie Morrisey (contralto); “Trio No. 1 in B flat” (eight parts) (Schubert), the New York Trio; and vocal numbers. 4.30: Close down. 6.0: Children’s hour. 7.0: Wireless session: News; evening concer« session, including: “ Madame Butterfly ” selection, American Symphony Orchestra; “Mikado Airs,” New York Opera Company; “Morning, Noon and Night in Vienna,” George Hamilton Green (xylophone); “The Bird Song.” The Night Wind,” Frieda Hempel (soprano) : (a) “The Cld Clo’ Man Rag” and (b) ’Banjo Medley,” Fred van Eps (banjo); 4 Drink to me Only with thine Lyes, Arthur Middleton (bass); “La Zingara,” American Symphony OrchesU a , : “£ onR: of the Vikings,” Orpheus Male Chorus; “Absent,” Hardy Williamson (tenor); “Chanson Meditation” Albert Spalding (violin) ; “Ballet Music” (Orpheus) and “Ben Bolt.” Elizabeth Spencer (soprano); (a) “Laugh, Clown, J.augh. (b) * Just Like a Melody out of the Sky,” Henrietta Kamern (organ) ; Dreamy Hawaiian Shore,” Virginia Burt (soprano); “The Horn,” Frederic Martin (bass); “ Valse ” (Chopin), Robert Schmitz (piano); “My Heart at Th v *weet Voice,” Louis Katsman (cornet) ; ‘ Cradle Song ” (Kreisler), Anna Case (soprano); “Song of Persia" and ‘ Creole Serenade,” Jiae Eleanor Ball (violin) ; “The World is Waiting for the Sunrise,’ Frederic Kingsley (organ); Kashmiri Song” (Woodford-Finden), Maggie Teyte (soprano); “Reminiscences of Ireland,” Sodero’s Band. 9.30 to 10.15: Dance music; close down. 4YA, Dunedin <461 Metres). 3.0 Chimes. Gramophone items. 5.0: Children’s session. 6.0: Dinner session. 7.0: News session. 8.0: Chimes. Studio programme by the Kaikoral Band and assisting artists: Band, “The Winning Fight.” “Evening Bells.” 8.8: Soprano—Miss Rita Holmes, selected. 8.12: Whistling solo—Sybil Sanderson Fagan, "Some Other Bird.” 8.15: Recitals—Miss Isobel M’Gregor, “Alms in Autumn,” “Grandma’s Advice.” 8.20: Band, "The French Maid.” 8.29: Tenor—Mr J. Montague, "Friend of Mine.” 8.33: Organ solo —Terence Casey, “Keys of Heaven.” 8.38: Vocal duet—Miss Rita Holmes and Miss Irene Horniblow, “In Springtime.” 8.41: Band, “Jamie’s Patrol.” 5.46: Baritone— Mr Ralph Martindale, “Tommy, Lad,”

“Invictus." 5.52: Debroy Somers’ Orchestra, “The Singring Fool.” 9.0: Weather report. 9.2: Contralto—Miss Irene Horniblow, “Dido’s Lament.” 9.6: Band—“lteminiscences of the Plantation.” 9.15: Recital—Miss Isobel M’Ciregor, “A Fantasy.” 9.17: Whistling solo—Sybil Fagan Sanderson, “Honeymoon Waltz.” 9.23: Tenor—Mr J. Montague, “Mother o’ Mine,” “For You Alone.” 9.30: Band, “Der hTeischutz.” 9.35: Soprano—Miss Rita Holmes, "Vale.” 9.42: Cornet, Mr Ira Goughian, “II Bacio.” 9.45: Baritone— Mr R. Martindale, “Roll on, Thou Deep and Dark Blue Ocean.” 9.4 9: Organ solo—Terence Casey, “Annie Laurie.” 9.52: Vocal duet—Miss Rita Holmes and Miss Irene Horniblow, “Bird Songs at Eventide.” 9.56: Band, “The Trumpeter’s Call.” 10.0: Close down. 4Q<J, Brisbane (385 Metres). 30 p.nj. to midnight: Studio presentation of the musical comedy “Tangles,” in three acts—described as “A Matrimonial Medley.” rOR WEDNESDAY. 3ZC, Christchurch. (250 meti'es). 10 a.m.: Women's session: Overture, ‘Zampa” (Hero Id), Edison Concert Orchestra. 10.8: Tested recipes—Tongue Jardiniere, Bavarian Cream, Chocolate Rice Cake. J 0.25: “Love’s Old Sweet Song,” Ferdinand Himmelreich (piano); She Is Far From the Land,” Thomas Chalmers (baritone); “Serenade” (Toselli), Arcadie Birkenholtz” (violin); "Valse Erica,” Rudy Weidoeft (saxophone) ; “On the Road to Mandalay,” Henri Scott (bass); “American Fantasie,” New York Military Band. 10.45: Miss Millicent Jennings in songs at the piano: “My Rosary For You” (Ball), “Only a Year Ago” (Albers), and “That’s All,” to be followed by “Annie Laurie,” Ferdinand Himmelreich (piano): “Melanie,” “Tango,” Arcadie Birkenholtz (violin): “Light as a Feather” (Rollinson), John Burckhardt (bells) : “Hush, Little Baby, Don’t You Cry,” Frieda Hem pel (soprano) and Lyric Male Quartet: “National Emblem March,” New York Military Band. 11.30: Close down. 12 noon to 1.30 p.m.: News and luncheon music session.