RADIO NOTES

Manawatu Standard, Volume L, Issue 115, 11 April 1930, Page 3

RADIO NOTES

MISCELLANEOUS. (By “Transformer.”) Since the last edition of notes a new broadcasting station has been opened, namely 2ZP Wairoa. Tho station, which has been experimenting for. some time, is now on double power. It is owned and operated by Mr A. E. Perry, of Wairoa, and transmits every day from 12 to 1.30, 3 till 5.30 and from 6.30 till 10 on a frequency of 840 k.c. Many listeners are no doubt aware of tho faot that tho majority of electric receivers are equippod with an instrument known either as a ballast tube or else as a line voltage control. This instrument, as its name implies, controls to a certain extent tho raw A.C. voltage entering the power pack. The need for this article was demonstrated the other day when a test of the a.c. line voltage over several halfhour periods showed that the voltage varied from 230 volts to 244 volts. Quito a number of listeners have remarked on the very fine programme from 2YA on Saturday night last. The selection of old time eongs proved very popular and in many cases brought back memories of long ago. “Transformer” has had enquiries concerning station 3UZ Melbourne. For the benefit of those interested, details of tho station aro as follow: —The station has a power of 500 watts nnd transmits daily from 9 a.m. to 10.45 p.m. on a wavelength of. 319 metres. It is operated by O. J. Milsen and Co., Bourke Street, Melbourne. 2ZK Wanganui was heard on Monday last from mid-day till 3.30 p.m., apparently testing out. Reception of tho station was excellent, all tho records.coming in at good speaker strength. Judging from tho strength of the signals, tho station is now on greater power. Saturday night’s programme from 2YA will bo of an exceptionally fine type. The combined theatre orchestras with wellknown vocalists will provide the concert session. The orchestra will comprise 80 professional musicians and will be playing under the baton of Mr John Bishop. This will be the first of a sories of such broadcasts. ELECTRICAL INTERFERENCE AND RADIO RECEPTION. Tho following is from the American Bureau of Standards: Radio reception is, in some localities, seriously disturbed by interference arising from electrical apparatus. in the vicinity. A brief outline of the scources of such intenorenco uud the methods usually used in mitigation will be given. No consideration is given to interference produced by radio apparatus. The only general remedy for electrical disturbance or interference is 1 co-operative effort, on the part of users of radio and users or owners of tho sources of electrical disturbances, to reduce or eliminate the oauso or causes. of the troubles. Much of the work in mitigation of electical interference results in an improvement in tho operation of tho electrical devices or supply lines, and is thus a double gain. There are, however, some electrical devices which, even when in perfect working order, cause disturbances which result in interference with radio reception. In many cases it is possible to provide filters, shields, chokes, etc., either at the source of disturbance or at tho receiving Bet, which do much to relieve tho difficulties. Part of the disturbance from electrical devices is practically inevitable and must be regarded, like atmospheric disturbances, as part of the inherent limitations of radio reception. In other words, tho limitation upon radio reception is not only tho distance and the power of the transmitting stations and the sensitiveness of the receiving set, but also the omnipresent background of slight electrical disturbances, which drown out signals below a certain intensity. This background of electrical disturbances is the underlying reason why reception from local stations is inherently superior to rojception from distant stations. Power lino induction. —A frequent cause of interference is power wires (a.c.) near the antenna or receiving sot. Low frequency voltages (usually 60 cycles) are induced and the resultant current flowing in the receiving circuit causes a “humming” sound in the telephone receivers. The low pitch of the hum will usually identify this source of interference. A method of eliminating or at least reducing the magnitude of this interference is to place tho antenna as far as possible from the power lines and at right angles to them. When the interference cannot be eliminated by such means, the proper choice of a receiving set may help. A counterpoise may also bo tried instead of the usual earth. An inductively coupled (two-cir-cuit) receiving set is less susceptible to such interference than a single circuit eet. The use of one or more stages of radio frequency amplification should also help to filter out the audio-frequency interference. It has been suggested that audiofrequency interference might be shunted around a receiving set having a series of antenna condenser by connecting between the antenna and the ground- terminals of the set a high resistance, which will offer lower impedance to the audio-fre-quency than will the reociving set itself. Sparking apparatus:—Sparks are produced in the normal operation of many types of electrical apparatus (Buch as motora, X-ray apparatus, violet ray apparatus, and some forms of battery chargers, etc.) . Sparks are also -sometimes produced at defective insulators, transformers, etc., of electric power lines. Sparks usually give rise to electrical waves which travel along the power wires and by them are radiated out and are then picked up by radio receiving sets. The noise thus produced in a radio set may come from disturbances that have travelled many miles along .the power lines. One remedy for such types of interference is to eliminate the spark. This is possible if the spark is an electrical leak and not necessary to the operation of the device in which it occurs. Many electrical machines, however, require for their operation the making and breaking of electrical circuits while they are carrying current, and whenever this happens a spark is produced; It is impossible to eliminate these machines, so that it is necessary to make the spark of such a nature, or so arrange the circuits, that the radio frequency current produced is prevented from radiating.

(To be continued). TO-NIGHT’S PROGRAMMES. Badio programmes for to-morrow are as follow: — IYA AUCKLAND (333 metres; 900 kilocycles).—s.o; Children's session. 6.0: Dinner music. 7.0: News and market reports. 7.40: Talk, Mr W. E. G. Wheeler, “Esperanto.” 8.0: Chimes. Relay from Lewis Eady Hall of latest vocal and instrumental music. 8.30: Instrumental, tho Studio Trio, (a) “Trio Adagio”; (b) “Capriccio.” 8.38: Contralto, Mrs B. Jellard, “All Joy be Thine.” 8.42: Piano, Mr Cyril Towsey, “Nocturne in C Minor.” 8.50: Talk, Mr A. B. Chappell, M.A., “Topical Talk.” 9.5: Weather forecast and announcements. 9.7: Instrumental, the Studio Trio, (a) “Love Song”; (b) “Serenade.” 9.17: Contralto, Mrs B. Jellard,’ (aj “My Secret”; ‘(b) “Tokens. ” 9.24: Violin, Misa Ina BoswOrth, “Tambourin.” 9.30: Gramophone lecture recital, Mr Karl Atkinson, “Gems from ‘Aida.’ ” God Save the King. 2YA WELLINGTON (416.7 metres; 620 kilocycles).—s.o: Children’s session. 6.0: Dinner music. 7.0: News session, market reports and sports results. 8.0: Chimes. This programme will be interrupted to permit of a relay of a talkie feature from the Majestic Theatre. Overture, 2YA Orchestrina, “Crown Diamonds.” Tenor, Mr Charles Williams, “Dalla Sua Pace.” Pianoforte, Miss Rose Smythe, “Romance in F Sharp.” Baritoife with chorus, Mr Will Goudie and Lyric Quartette, “The Desert Song.” Opera selection, 2YA Orchestrina, “II Trovatore.” Gramophone record. Soprano, Miss Dorothy Newman, “Waltz Song.” Duet, Messrs Chas. Williams and Will Goudie, “In This Solemn Hour.” Musical oomedy selection, 2YA Orchestrina, “Firefly.” Weather report and announcements. Tenor, Mr ■ W. Roy Hill, “Quests O Quella. Gramophone record. Bass, Mr W. Binet Brown, “Vulcan's Song.” Instrumental, 2YA Orchestrina, “Verbena de la Paloma.” _ Play, a studio presentation of a comedy in one act by Crawshay-Williams, entitled, “A Storm in a Breakfast Cup.” Cast: John, Victor S. Lloyd; Phyllis, Elsie Lloyd; Graves, E. R. Render. Gramophone record. Soprano, Miss

Dorothy Newman, “Iths No Use Crying for the Moon.” Quartet, the Lyric, “Tho Pilgrims’ Chorus.” Valse, 2YA Orchcstrina, “Mon Rove.” God Save the King. 3YA CHRISTCHURCH (306 metres; 930 kilocycles).—s.o: Children’s session. 6.0: Dinner music. 7.0: _News session. 7.30: Talk, Mr J. L. Tennont, “The Treatment and Caro of the Feet.” 8.0: Chimes. Popular and dance programme. Gramophone record. 8.5: Tenor, Mr Douglas Suckling, /“To-morrow.” 8.9: Sfcprano, Mrs Lucy O’Brien, “Mifanwy.” 8.13: Violin, Miss Irene Morris, “Chanson Napolitaino” (d’Ambrosio). 8.19: Vaudeville turn, Mr Eddy Hogan, “Story, Song and Dance.” 8.31: Instrumental, Christchurch Broadcasting Trio, (a) “Love Song”; (b) “Serenade”; (c) “Rondo Alla Turka.” 8.36: Bass, Mr Finlay Robb, (a) “Five Eyes”; (b) “Freebooter’s Song.” 8.42: Mezzo-so-prano, Miss Doris Irvine, “Love, the Pedlar.” 8.46: Humour, Miss Ruby Boot, (a) “Poetical Economy”; (b) “The Bath.” 8.51: Violin, Miss Irene Morris, “La “Dileuse.” 8.54: Tenor, Mr Douglas Suckling, (a) “A Nest in Arcady”; (b) “Yours and Mine.” 9.0: Weather report and announcements. 9.2: Soprano, Mrs Lucy O’Brien, (a) “Invitation”; (b) “Land of Long Ago.” 9.8: Instrumental, Christchurch Broadcasting Trio, “Rondo Finale.” 9.15: Vaudeville turn, Mr Eddy Hegan, “Story, Song and Dance.” 9.20: Bass, Mr Finlay Robb, “The Early Morning.” 9.23: Mezzo-soprano, Miss Doris Irvine, (a) “Sing, Joyous Bird”; (b) “A May Morning.” 9,27: Humour, Miss Ruby Boot, “Lifo or Literature.” 9.31: Dance music. 11.0: Close down. . 4YA DUNEDIN (463 metes; 650 kilocycles).—s p.m.: Children’s session. 6.0: Dinner music. 7.0: News session. 8.0:Chimes. Salon Orchestra, March, Orchestra, “Kaiser Frederick.” Selection, Orchestra, “Kissing Time.” 8.12: Soprano, Miss Evelyn Shepard, “Fair Spring is Returning.” 8.15: Gramophone record. 8.19: Recital, Mr D. E. Dali, “The. Devil’s Speech.” 8.24: Selection, Salon Orchestra, “Magic Flute.” 8.32: Tenor, Mr George Crawford, (a) “O Sing Mo the Au’.d Scotch Songs”; (b) "Oft in the Stilly Night.” 8.38: Piano, Mrs C. Drake, “Etude Mignon.” 8.43: Gramophone record. 8.43 : Gramophone record. 8.47: Seelction, Salon Orchestra, “Offenbach.” 8.53: Baritone, Mr Noel H. North, “Nightfall at Sea.” 8.56: Gramophone record. 9.0: Weather report. 9.2: Suite, Salon Orchestra, “Suito No. 3” (1) “Wandering in tho Wood”; (2) “Minstrel Song”; (3) “Sehnsucht Klango.” 9.12: Soprano, Miss Evelyn Chepard, (a) "Mignon” ; (b) “The Dreary Steppe.” 9.18: Gramophone record. 9.22: Recitals, Mr D. E. Dali, (a) “Misunderstood” ; (b) “The Queen’s Look.” 9.28: Selection. Salon Orchestra, (a) "Petite Rhapsody Russc”, (b) “Roses of Picardy.” 9.36: Tenor, Mr George Crawford, “My Love is Like a Red, Red Rose.” 9.40: Gramophone record. 9.46: Overture, Salon Orchestra, “Ruy Bias.” 9.51: Baritone, Mr Noel H. North, (a) “From tho Land of tho SkyBlue Water”; (b) “Just for To-day.” 9.57: W T altz> Salon Orchestra, “Summer Evening.” 10.2: God Save the King. 2FC SYDNEY (451 metres; 680 kilocycles).—2.3o p.m.: Afternodn session. 6.0: Children’s session. 8.0: Robert Gilbert, Baritone. 8.7: Christian Hcllemann at tho Organ. 8.15: A 1 Hammett, saxophone solo. 8.18: Robert Gilbert, baritone. 8.21 : Christian Hclleman at the organ. 8.29: All Hammett, saxophone solos, 8.36: Robert Gilbert. 8.29: Christian Hellemann at the organ. 9.45: A popular presentation, entitled “Another Pair of Spectacles,” a farce in ono act. 9.15: Relay from 3LO Melbourne. 11.30: Close down.

2BL SYDNEY (353 metres; 850 kilocycles).—3 p.m. : Afternoon session. 6.0: Children’s session. 8.0: The Studio Orchestra. 8.7: Muriel O’Malley, contralto. 8.10: Vincent A6pey, violinist. 8.13: Orchestra. 8.20: Norman • Wright, tenor. 8.26: Jack Post ’cellist. 8.29: Orchestra. 8.59: Muriel O f Malley. 9.6: Lily Price, pianoforte recital. 9.20: Norman Wright, tenor. 9.25: Ethel Colin Dyslcr, sketch. 9.35: Muriel O’Malley. 9.38: Lily Price,, pianoforte recital with foreword by C. N. Baeyertz. 9.50: Ethel Lang and Colin Dyster, sketch. 10.0: Norman Wright. 10.3: Claude Corbett. 10.30: National Anthem. Close. • 2GB SYDNEY (316 metres; 950 kilocycles).—B to 10.30 p.m. : Concert session. 3LO MELBOURNE (371 metros; 810 kilocycles). —8 p.m.: Half an hour with tho Classics. 8.30: "Uncle Tom’s Cabin,” third episode. 9.0: Reminiscences of vaudoville. 9.15: St. Augustine’s Orphanage Band. 9.25 :• Violet Jackson, soprano, and Tom Downie, tenor. 9.308 and. 9.38: Ho, ( She and a piano. 9.43: Band. 9.55: Origin of famous songs, “The Men of Harlech.'” 10.5: Band. 10.15: Erio Welch, sporting. 10.25: Band. 10.30: News. 10.40: Melodians. Popular numbers. 11.30: Close down. 3AR MELBOURNE (484 metres; 620 kilocycles).—B to 10.30: Concert programme. 4QG BRISBANE (395 metres; 760 kilocycles). —8 to 11 p.m.: Concert programme. .Orchestral items interspersed with selected recordings of famous artists. Note. —New Zealand time is one and ahalf hours ahead of eastern Australian time.