WIRELESS NEWS

Press, Volume LXVII, Issue 20334, 5 September 1931, Page 7

WIRELESS NEWS

( By "MAX.") The causes of interference may be * divided into some fivo classes, namely: (1) radiating receivers; (2) heterodyning by another transmitting station; (3) low frequency A.C.; (4) motors and all types of electrieal apparatus; and (5) static. The first is due to either ignorance or selfishness on the part of the set users. The second can be cured if one of the stations Tvill shift wave sufficiently to make the beat note above audibility. The frame aerial is often helpful if the receiver is sensitive enough to bring in the required station at sufficient strength. Static is perhaps the only trouble ■which cannot bo remedied completely, though the use of a loop aerial or a fairly short outside aerial Trill aid in reducing the effects of atmospherics. On the short wavelengths especif ,! v, an indoor antenna is another means oi' cutting down static, j though naturally at the expense of sig- j nal strength. I

A good earth is one of the essentials for overcoming interference, and the earth should be as short as possible and also be of heavy wire. An old copper boiler or a sheet of copper plate makes an excellent earth, the latter being sunk six feet deep and placed vertically. Another method is to employ some half-dozen separate pipes driven into the soil about six feet apart aud with a lead from each to the main earth lead. Whore the soil is extremely dry, a counterpoise consisting of one or more wires, well insulated from the ground and about soven feet above the earth, is the best remedy. When a device is used to eliminate A.C. interference, and this has to bo earthed, use a separate earth, besides the principal one.

High frequency disturbances which feed into a receiver via the electric light mains can usually be stopped by chokes and condensers. From fifty to two hundred turns will be needed on each choke, one going in each lead from the mains A.C. supply to the set. Two condensers each of one mfd. or loss aro joined in series across the receiver aide of the chokes and the midpoint is grounded to a separate earth. These condensers must stand up to about double the mains voltage, as the peak voltage of the A.C. is some fifty per cent, greater than the average working, voltage. They should also bo of such a construction that they possess practically no self-inductance, otherwiso the effective value in microfada is considerably lower than the maker's rating,, when under working conditions.

Another dodge with aerials which, pick up low frequency interference is to keep the aerial itself well away from any electric light wires and at right angles to any in the vicinity. Then run a double lead similar to those commonly used by many amateurs for transmitting. One of the feoder lines is insulated where it terminates closu to. the antenna, and the feeders are spaced rigidly with insulating rods, so that they are about six to ten inches apart. Af the receiver end the feeders are connected to a coil whose centre point is earthed. A coupling coil ; >s joined to the receiver terminals tc transfer the signal energy to the set. Further hints relative to interference will follow at an early date.

t>r. S. N. Baruch, of New York, claims the invention of a system which, if true, will do away with all the trouble eausod by sidebands widening tha carrier wave. This would benefit not only the ordinary broadcasting, but also television when the latter reaches a practical stage o£ development. The apparent broadness of a carrier is due tc the modulation adding what are termed sidebands. Sidebands are the addition of the voice frequencies to the steady carrier frequency, and ten thousand eyclea above and below the latter is the usual limit.

3YA will rebroadcast 2YA this afternoon—Australia v. Wellington Kugby Match.

The programme to be broadcast by BYA this evening will be of the weekend type. Mr Claude Borrows, the possessor of a fine baritone voice, will be singing some popular ballads. Mr Jock Lockhart will be heard in humorour songs and stories. A new party of vaudeville entertainers, "The Two Rascals and their Rascalettes" will be making their radio debut, providing two twetoty-minute entertainments. The personnel of this party is: Miss Molva Cater, Miss Alice Greenlees. Mr Bert Goodland and Mr Eddie Hegan, all well-known entertainers. Mr Francis Bate'a Salon Orchestra will also contribute to the programme, playing popular selections.

There will be a rather unique feature r about 3YA's programme on Monday 1 evening, which will be "Port Lyttel- * ton Night" when the entertainment will < be entirely of a nautical nature. Dur- < ing tKe evening, 3YA will switch over £ to the Lyttelton Borough Council table, , where the Mayor, Mr F. E. Sutton, will be presiding at a meeting. The meet- \ ing will be interrupted- while Mr 1 Sutton addresses ■ radio listeners on "Port Lyttelton—Past' and Present." \ One of the contributors to the musical ' programme will be Miss Myra Sutton, daughter of the Mayor. Also on the ' programme will be Mr W. J. Richards .. (bass), Mr Geo. Titchener (humorist), the Christchurch Broadcasting Trio and Derry's Military Band. Bandsman C. Barsby will contribute a trombone solo, "The Death of Nelson." ** • ] Next 'Wednesday afternoon the Australia v. Maoris match at Palmerston , North will be broadcast by 2TA and rebroadcast by 3YA. , ■ * # "Farmer Brown will discuss burnt , lime with the instructor'' next Wedness- ' day evening' from 3YA. This is one of the popular 4YA farming dialogues ; given by Mr L. W. McCaslcill and Mr : R. B. Tennent. The lecturer for the International Programme at 3YA on Thursday even- ■ ing will be Mr L. B. K. Denny, M.A., F.E.H.S., of Christchurch Technical ' j College. He will speak on "Java."|where he spent some time last year. One of the most popular type of pro- ■ grammes put on the air is an old-time concert. Thero will accordingly be many sets tuned in to 4YA next Friday evening. Assisted by vocalists, the Select Four and Mr Bert Rawlinson, ■ Bags 'a Band will present an old-time programme entitled "Songs of Other j Days," a few of the it s being "I've Rings on My Fingers," "Maggie ! Murphy's Home," "Sister Mary i Walked Like That," "Where Did you Get that Hat?" and "Ship Ahoy I" ' \k 1 Personalities on 3YA programmes j next week include: '' ; [ Miss Addie Campbell, who created a furore in Australian musical circles,

Notes From Far and Near

r BROADCASTING. TO-DAY'S PROGRAMMES. 3YA, CHRISTCURCH, (980 Kilocycles.) On air at 1 p.m. to-day. i.30 p.m.: Broadcasting from Lancaster Park: Hockey match, Havrke's Bay v. Canterbury. 2.50 p.m.: Rebroadcast' of 2YA.—FeEcriptiou of Australia v. Wellington Rugby Match. 5.0: Children's hour. 6.0: Dinner music sosaion (Polydor). 7.0: News s63aion. 7.30: Sports results, 8.0: Chimes. Overture—Dajou Bcla Orchestra, "Mosaic'' Potpourri. 8.3: Baritone-pMr Claude Burrows with orchestral accompaniment, "Yeoman's Wedding Song" (Poniatowski). 8.13: Baritone —Harry Resor, (a) "Cracker Jack" (Ueser); (b) "I'lapperette." 8.18: Humour in song and story—Mr Jock Loekliart, (a) "AII Scotch" (Elton) ; . (b) "He's Always Borrowing Money" (Scott). 8.26: Selection Salon Orchestra, "The Vagabond King" (Rudolf Friml). 8.36: Uevuette—The Two Rascals and thoir Rascalotte, (a) "A Little Argument About Rehearsal"; (b) Song, "I Miss a Little Miss" (Seymour and Coote); (c) "Bits and Pieces in Story and Dance" (air. Hcgan); (d) Sketch, "Horses" (»i*r. Hegan); (e) "Specialty, "Hot' Piano" (arr. Hegan). 8.56: Accordion—Reno Leroux and Bal Musette Orchestra, (a) "The Bride"; (b) "Philadelphia" (Engel). 9.2: Evening weather forecast and station notices. 9.4: Two Spanish pieces—Salon Orchestra, (a) "La Paloma" (Yradier); (b) "Josolita" (do Bonozi). 9.12: Baritone—Mr Claude Burrows, with orchestral accompaniment, (a) "A Banjo Song" (Homer); (b) "Cloze Props" (Charles). 9.18: Guitars—Eugonio Rezes and Domingo Noriega, (a) "El Gnucho" Tango; (b) "La Sorella" March (Schika), 9.24: Humour in song and story— Mr Jock Lockhart, "Where's the Face You Had oil Monday?" (Walsh). 9.28: Seloction —Salon Octet, "Wilfred Sanderson's Popular Songs." 9.37: Revuette —Tho Two Rascals and Their Raacalettes, (a) "The Erring Hußband" (arr. Hegan); (b) "Do You Remember the Time" (arr. Hegan); (c) "Specialty—Piano and Song Medley" (arr. Goodland); (d) Sketch, "Before and After" (arr. Hegan); (o) Finale, "Improvisations in Music, Rone and Dance." 9.57: MarchBlack Diamonds Band, "Guards' Parade ' (Fan-ell). 10.0: Dance music (Columbia). SZC, OHKISTCHUBCK (250 Metres.) 10 a.m.: Morning session. "Minuet" (Boccherini) and "Yalse Triste," London String Orchestra: "The Pirate of Penzance,'' Vocal Govns: * 'Autorane ' and "Liebestraume.'' Maurice Cole (piano): "Caro Nome." Thea Philips (soprano): "Songs by the Camp Fireside." Band of H.M. Welsh Guards and Chorus: "The Floral Danoo" and "The Lute Player." Graham Stewart (bass); "An Eastern Romance" and "Intermezzo," Herbert Griffiths (organ): "Love's Old Sweet Song" and "Minuet," Vocal duet: "Simple Aveu" and "Souvenir," X'eggy Cochrane (violin): "Entry of the Gladiators" and "El Capitan, ' Band of H.M. Life Guards: "I Feel You Near Me" and "A Pair of Blue Eyes," Terence O'Brien (tenor): "Follow A Star," selection, Bidgood's Orchestra: "She's A Georseoua Thing" and 41 Would You Like To Take A Walk," Those Three Fellows: "The King's Horses," Palais D'Or Orchestra: "Captain Cook," and "Mademoiselle from Armentieres," Pat Honna (monologues); "It Happened in Monterey," and "Song of the Dawn," Foxtrots: "Carry On," Sundowner's Quartet: "Truly" and "You're The One I Care For," Harry Chrysler (organ): "Topsy Turvy Talk," Leslie Sarony (humour): "Old-Fashioned Girl" and "I Am Only the Words," (Foxtrots): ' 'Years Ago" and "Smile Away," Humorous Vocal: "Betty Co-ed." March: "Crying For the Carolines," Vocal: "There's Danger in Your Eyes, Cherie" and "Got the Bench, Got t the Park." 2YA, WELLINGTON, (720 Kilocycles.) ii p.m.: Relay of Rugby Football Match from Athletic Pork, Australia v. Wellington. 6.0: Children's session, conducted by Aunt Molly. G.O: Dinner music session (Polydor). 7.0: News session, market reports and sport 3 results. 7.40: LecturoHe —Dr. I. A. Henning, Lecturer in Modern Languages, Victoria University College. "The Pronunciation of English." (A W.E.A. lecturette). 8.0: Chimes. Relay from the Town Hall of the Final Demonstration Concert of the Wellington Competitions Society's 1981 Festival. 10.0: Danco programmo (H.M.V.). SUNDAY. 3YA, CHRISTCHtTKCH. 3 p.m.: Gramophone recit*/. 3.30: Children's song service by children from Methodist Sunday Schools. 6.15: Chimes from studio. 6.30: Relay of evenins service from Durham street Methodist Church. Preacher, Rev. P, N. Knight. Organist and ■ Choirmaster, Mr A. Wellbrock, L.AiB. 7.45: Musical recordings from studio. 8.15 (appro*.): Relay of evening programme from 4YA, Dune4in. 2YA, WELLINGTON. 3 p.m.: Afternoon session of selected gramophone recordings. 0.0: Children's song service, conducted by Uncle George, and assisted by the Children's Choir from St. James's Presbyterian. Church. 7.0: Relay of evening service from the Vivian street Church of Christ. Preacher, Pastor W. G. Carpenter. Organist, Miss Haxel Hunter. 8.15 (approx.): Relay of concert by the Royal Naval Volunteer Reserve Bpnd from the De Luxe Theatre (Conductor, Mr Harry Baker).

earning the sobriquet of "The Bendigo Nightingale." -x- * Miss Lucy Fullwocrd, a gifted musician, as singer and pianist. Miss Xancy Bishop, well-known Ashburton singer and reciter who was heard 011 the air on the occasion oi' the recent Sunday evening relay from that town* * *x Mr S. G-. Hoskins, pianist, composer and inventor of earthquake recording apparatus. . -* * Mr Clive Hindle, a baritone who broadcasts particularly well. He is in demand for the concert platform and has been engaged, to take leading roles in. forthcoming performances of "A Country Girl" and "Faust."