WIRELESS NEWS

Press, Volume LXVII, Issue 20316, 15 August 1931, Page 8

WIRELESS NEWS

! (By "MAX.") Interference is a problem which becomes of increasing importance as the number of license holders grows. In different countries this fact is treated in different ways, organised efforts being made to overcome the trouble in some instances whilst in others comparatively no steps are taken to eliminate or even to mitigate the nuisance. Disinclination to interfere with power companies, duo to the cost, is prooably responsible ior tho lack o£ action. Against the cost ot I overhauling and rectifying iaults in power supply can, however, be offset • the saving in current in many cases. * » Germany is a country which has done more than any other to combat the nuisance, and regulations make it obligatory on the part of installers of telephone apparatus, for example, to eliminate any interference which newly installed connexions cause to receiving sets, which were in use prior to the new telephone lines. Similarly the makers of high frequency apparatus for medical purposes must make tho electrical machines so that they will not be a source of interference. It is expected that this law will be gradually extended until all electrical manufacturers will bo required to comply with it. # * The above information and the following notes relative to the same subject are extracted from a compact -but comprehensive booklet issued by Philips Radio for the purpose of assisting in the removal and avoidance of radio interference. The subject has been carefully considered, and the matter makes pleasant and interesting reading, wnich is most valuable for tho purpose intended. * * Germany has been divided into 1240 interference zones, and 4000 "interference tracers" have already been enrolled, and when a complaint of interference is received by the '"interference squad" of the broadcast company in any zone, steps are itnmediatelv taken to track down the trouble. Of 12,000 reported cases, 7500 have been remedied by these squads. Tt is stated that 60 per cent, of all bad cases of interference are due to H.F. medical apparatus. ♦ * Demonstrations are given of interfering and also non-interfering apparatus, such as sewing-machines and vacuum machines, the object being to show how the addition of comparatively simple and inexpensive units can convert a source of interference into a non-troublesome one The booklet is primarily intended for the use of electrical manufacturers and users of electrical machinery, such as tramway companies and power suppliers, but it is intended to extend the sc<3po. of those interested to all public bodies, radio industries, etc. Details of the various remedial measures will be given in a later issup of this column. * * Curiously enough, one of tho hints described and illustrated for the purpose of removing interference caused by electric bells was being considered by the writer as a means of sharpening up the tuning of a buzzer operated wavemetef. A buzzer wavemeter is Bimplv an electrical buzzer used in conjunction with a wavemeter, which is merely a calibrated coil-con-denser combination. It was designed principally for finding the wavelength, of a tuned circuit a crystal circuit,'' as a rule. Now the m<j^t«s,positive spot on a, crystal can also be found by the same means, but for either purpose the "wave" is fairly broad; similar to a' l spark station, in fact, and it was thought that a slight change in the wiring might sharpen ~up the buzzer* - wavemeter. The idea is' to -connect J"®" make-and-breaU of the buzzer so that, the current from the battery goes through one coil of the magnet, then through the make and 7 break and back to the battery, via the other magnet coil. Each coil of the magnet should act as a choke to the high frequency oscillations set up in the wavemeter circuit. Either a block in condenser of high capacity will be required to prevent short circuiting of the battery or a series circuit for the wavemeter will be necessary. The latter will then be a replica of the famous emergency spark coil set used on ships simply a coil and a variable condenser across the make-and-break. Omit the tuned circuit, and we the best way to connect a bell to avoid interference. * » This Saturday evening it is 3YA's turn to relay 4YA's studio programme, which will he a real radio vaudeville entertainment. Popular quartettes will be sung by.the Four Aces, and choruses will also be Bung to such solos as "Jingle Bells," "Can't Remember," "Massa's in de Cold Ground," "Yeoman Wedding," and "I'se Gwine Back to Dixie." Also on the programme will bo Mr W. B. Lambert, who specialises in Hebrew humour, Stokes Banjo Band, Mr W. J. Sinton, an artist* on the xylophone, and Mr J. Dalbianco, an exponent of the piano accordion. ** • ' To-morrow (Sunday) morning and on j Tuesday, Wednesday, and Thursday mornings tho New Zealand stations will he on the air to broadcast a summary description of play in the third cricket Test between New Zealand and England. As on the two previous occasions, the radio telephone system will be utilised. * * Three distinct relays will be carried out by 3YA from Asliburton to-morrow evening—the children's song service, the church service, and the after-church concert. The latter, which is to be given by the Asliburton Silver Band, will also bo broadcasted by 4YA (Duncdin) and 4ZP (Invercargill). *■ # 2YA's classical programme on Monday evening will feature the works of Mozart, of whom a "Musical Portrait" will be presented. Tho performers will U'e Signor Lucien Cesaroni and company. ♦ » Mr Te Ari Pitama, the well-known radio Maori lecturer, will be speaking from 3YA next Wednesday evening on "Tho South Island Maori," and on Thursday evening Mr W. Macliin, general manager of tho New Zealand Farmers' Co-operative Association, will discourse from the same station on "International Indebtedness." * * Two new scries of international programmes will be put on the air next week—one.»from 2YA and one from 4YA. There is no doubt of the popularity of these overseas recorded programmes, which introduce into JSJew Zealand service novel features winch couffi not be presented in any other way to listeners of this country. * * It was pleasing to hear "Uncle Jack" on the air again this week l'rom 3YA. Uncle Jack, who is Mr xJ. J. Bell, librarian at the Public Library/ Christchurch, was the pioneer of radio uncles in New Zealand, and a very popular one. It is a year or so now since he appeared before the microphone at the children's session, which he forsook because of the pressure of other duties. Children, who love stories, will look forward to hearing Mm again,

"Notes From Far and Near

BROADCASTING. "4 " ' TO-DAY'S PROGRAMMES. 3YA, CHRISTOHTJBCH (980 Kilocycles.) 11.30 a.m.: Results of races of Canterbury Jocke," Club's meeting at Riccarton, interspersed with musical recordings. 2.50 p.m.: Running description of Football Match. 5.0: Children's Hour. 6.0: Dinner music se&sion (JI.M.V.). 7.0: News Bession. 7.30: Sports results. 8.0: Chimes. Relay of programme from 4YA, Dunedin. 10.0: Danco music (Polydor). For the special benefit of South Island listeners, a robroadcast of 2YA's description of the play In the North v. South I>.land Rugby match. 3ZO, CHRISTCHURCH (250 Metres.) 8 a.m.: Breakfast session: "Mlgnon" Overture, Berlin String Orchestra: "My Old Shako," Manuel Hemmingway (tenor): "Simple Aveu," and "Souvenir," Peggy Cochrane (violin): "Florodora"—Selection, Band of His Majesty's Welsh Guards: "The Victors," March All Star Collegians: "Cooking Breakfast for the One I Love" and "Kickiu' a Hole in the Sky," Sylvia Morgan (soprano): "Cheer Up" and "Kitty from Kansas City," Imperial Dance Orchestra: "When I'm Looking at You," and "Little White Lies," (Tenor): "Singing a Song to tho Stars" and "I Remember you from Somewhere," (foxtrots): "Smilin' Through," Ethel Hook (contralto): "Ballet Egyptian," Herbert Griffith (organ): "When tho Sergeant-Major's on Parade," Arthur Vivian (organ): 9.0: Race Review by the sporting announcer, Mr A. It. Allardyce: "Song of the Volga Boatmen," Vocalian String Orchestra: "One Fine Day" and "Caro Nome," Thea Phillips (soprano): "The Arcadians," Band of H.M. Life Guards: "I've a little Love Song," and "When the organ played at Twilight," Robert Nicholson (baritone): "Why can't You" and "The Toymaker's Dream," (Foxtrots): "Here comes the Sun" and "My Baby just cares for Me," (tenor): "Tho Peanut Vendor," (foxtrot): "Have a little faith in Me" and "Crying for the Carolines" (vocal trio): "My little Cottage," and "By the Waters of Minnetonka," Betsy de la Porto (soprano): "Intermezzo" "Cavalleria Rusticana," and "Poem," London String Or* chestra: "Gems from 'Carmen,'" (vocal medley): "American Medley" and "Popular Old Time Medley," (Tenor banjo solo): "Maid of the Mountains" Medley: Band of lI.M. Welsh Guards. 2YA, WELLINGTON (720 Kilocycles.) 3 p.m. Relay of Rugby Football Match from Athletic Park. 5.0: Children's nession, conducted by Aunt Molly. 6.0: Dinner music seession (Polydor). 7.0: News session, market reports and sports results. 7.40: Lecturette—Mr K. McLennan, Wellington Competitions Society, "Competitions." 8.0. Chimes-. Relay from the Concert Chamber, Town Hall, of concert by the Wellington Harmonic Society. Choral dance —The Choir, "Pan" (Rutland Broughton). Part song—The Choir, "The Serenade" (Brahms). Violin —Mr Leon de Mauny, "Reverie" ( Vieuxtenips). Madrigal—The Choir, "In the Merry Month of May" (Gaines). Contralto —Mrs Wilfred Andrews, "Poland's Dirge" (Chopin) Part song—The Choir, "All Things Are Still" (Redman); "Wi' a Hundred Pipors" (Scottish air, arr. West) Evening weather report and station notices. Part song—The Ladies, "The Snow" (El gar), with accompaniment for two violins und piano. Negro Spiritual—Tho Choir. "Nobody Knows the Trouble I See." Violin—Mr Leon de Mauny, (a) "Air on the G String" (Bach); (b) "Loure" (Bach). Chnral song—The Choir, "Death on the Hills" (Elgar). Contralto with violin obbligato by Mr Leon de Mauny—Mrs Wilfred Andrews, "Praises" (Heritte-Viardot). Part song—The Choir, "You Stole My Lovo" (MacFarren). Festival carol—The Choir, "Ring Out, Wild Bells" (Fletcher). 10.0: From the Studio—Dance music programme (Brunswick). 11.0: Sporting summary. SUNDAY. ( 3YA. CHBISTOHUBCH. 1 3 p.m.; Gramophone recital. 5.80: Belay from Ashburton of Baring Square Methodist Church Children's Song Service, under the supervision of Rev. G. B. Hinton. 6.15: Organ music by Mr John Corbett from Barins Square Methodist Church. L 16.30: Relay of evening -service from Baring Square Methodist Church. Preacher. Itev. G. B. Hinton; choir conductor. Mr H. A. Humphreys; organist, Mr John Corbett. 5.15 (approx.): .Relay of concert programme by Ashburton E'ilver Band, from His Majesty's Theatre, Ashburton. 3ZO, CHBISTOHUBCH (250 Metres.) 10 ».m.: Morning session: 6 p.m.: Dinner music session: 7.0: Short wave session: 8.0: Evening concert session of selected recordings. 2YA, WELLINGTON. 8 p.m.: Selected gramophone recordings. 6.0: Children's song service, conducted by Uncle George, and assisted by the Children's Choir from the Karori Methodist Church. 7.0: Belay of evening service from St. Andrew's Presbyterian Church. Preacher, Rev. R. J. Howie, 8.A.; Organist and choirmaster, Mr Frank Thomas. 8.15 (approx.): Relay of Band Recital by the Royal Naval Volunteer Reserve Band from the De Luxe Theatre (Conductor, Mr Harry Baker).

On Wednesday evening last a "New Zealand Night" was given at 4YA, Dunedin. Christchurcb was represented by Mr R. A. Home, manager of the Bristol Piano Company, who has numerous songs and instrumental works to his credit. * * Owing to the Rockhampton station, 4RK, heterodyning with IYA, Auckland, the operating frequency of the latter station has been altered to 875 kilocycles (343 metres). Incidentally, this change makes it much easier for Christchurch listeners to cut out 3YA when they wish to tune in IYA. » » Two c New Zealand's finest vocalists will shortly tour the YA stations. Miss Merle Miller, studio pianist at 3YA and a mezzo-sOprano singer of merit, will, early in September, give three recitals from IYA and 2YA. Later on , in the month Maherita Zelanda, coloratura soprano of Dunedin, who toured the YA stations a few months ago under engagement to the Broadcasting Company, and who created a furore when she sang at the Auckland Radio Exhibition, will appear at all the stations. Everybody's getting it now—our "Cut and Dried" Kindling. Much quicker, and easier all the time, and very much cheaper 111 the end. Bags of full measure 2s 9d. Q. McClatchio and Co., Ltd., 160 Hereford street.