THE RADIO WORLD.

Hawke's Bay Tribune, Volume XVII, Issue 202, 10 August 1927, Page 9

THE RADIO WORLD.

LOOAL STATION PROPOSAL. (By “VALVE.”) The annual meeting of the Hatvke’s Bay Radio Society was held in Hastings on Monday night and a large amount of important business was transacted. Comment on the meeting will, however, be held over till next week, on account of pressure on space. Matters in connection with the local broadcasting station are now starting to move, a bit -faster and in the course of a few weeks the society should be in a position to make a definite start on the proposal. During the last couple of weeks several further donations have been received and the total in hand is now over £4O. Quite a large number of promises to take debentures have been recoivd and with the promises lived up to the first £lOO should be quickly reached. In this connection it is sincerely hoped that all listeners will put their shoulders to the wheel and give the canvass their strongest support. The debenture will cost only 10s and if every licensee took one only there would be more than enough to get the station going well. A good deal of comment is hear on the possibility of difficulty in securing talent, but in this connection, it may be nientoned that promise of assistance has been received from stu dents at the various colleges in Hastings and Napier, the Orphans Clubs in both places also in Waipukurau, various musical societies throughout the district as well as from many private individuals. There should bo no difficulty with the programmes and listeners may rest assured that they will be given some very unique programmes, particularly from the Maori performers in the district. RADIO DICTIONARY. The following is a continuation of our radio dictionary, giving a portion of the “C’s.” Capacity.—The capacity of a condenser is its ability to hold or retain a charge of electricity. The capacity of an accumulator is its capacity for receiving and giving up a charge of electricity. Carborundum.—Crystals formed by a cnemical union of selecon and carbon.

Cat’s Whisker.—The fine wire used to make contact with the crystal of a crystal detector.

Cell.—A primary cell is a device by means of which electric current can be generated by chemical means. A w,et cell is one in which a liquid solution is employed. A dry cell in which there is no liquid that cun be spilt. A secondary cell is one of the cells of an accumulator.

Choke-coil.—A coil of high self-in-duction which offers greater opposition to an oscillating current than does an ordinary inductance. It consists of a coil of wire with an iron core, and the degree of self-induction may be varriod by moving the core further into or out of the coil.

Circuit.—Any path along which an electric current can flow. A closed circuit is one in which there is no break so that current is free to flow; an open circuit is one in which there is a break or gap so that current cannot flow. An internal circuit is that portion of a circuit within a generator: An external circuit is the portion outside the generator An open oscillatory circuit is one such as is formed by an aerial and earth; a closed oscillatory circuit is a closed circuit containing inductance and capacity, adapted for the flow of a high fiequeny oscillating current.

In last week’s notes it was mentioned what parts were required for the construction of a simple crystal receiver. Readers who have secured the necessary parts should have no difficulty in following the constructional details as follows:—

“The cardboard should be rolled into a tubular shape about 4J Inches in diameter and six to seven inches long. These tubes, by the way, can be procured from any dealer at small cost. When the tube is evenly rolled, glue it together. About half an inch from each end make a small hole large enough to thread one end of the enamelled wire through. Now begin winding the wire on the tube taking great, care that each strand is kept perfectly level and even and nice and tight, so that slide slipping is made impossible. It is a good plan to cover the cardboard with a coating of shellac before winding the wire, as when it is dry it will afford a grip for the wire, and so prevent it slipping. About 140 turns will be sufficient. When the winding is finished, thread the loose wire through the hole at the other end of te tube, and give it a couple of turns round a drawing pin struck inside the cardboard tube.

The first part of your set, the inductance is now practically completed. Now take an odd panel of wood, a liyle longer and wider than the tube, and fix the tube to it (lying down/, by means of screws or drawing pins inserted in the inside ends of the tube. Next take a pliable brass or copper strip about live inches long. Screw one end of this about the centre of the base board (on the side) and bend it, so that the other end scrapes against the tube of coiled wire. This brass strip must rest firmly against the coiled wire, so that when it is moved from side to side, it will make contact with the wire all the time, ami gradually rub away the enamelled insulation on the wire. Then take the crystal, being careful not to get it dirty or damp from your hands, and wrap it firmly and tightly in a wad of lead foil such as is found in chocolate boxes, allowing half of it to project clear ’and free from the coil. Fix this firmly into a small brass cup, an old thimble will do, and fit it on to another small base board of wood. Next take about eight inches of your coiled copper wire, eoil it into the form of a spring, fixing one end to the board and the other being allowed to rest lightly on the crystal. Both ends should be scraped so that the bare wire is exposed. Now take the lower end of your aerial wire, the down lead, to one end of the inductance coil. Next connect a wire from the brass strip to n water pipe, and also to one of the telephone leads. From the other telephone lead, connect a wire, to Ihe coil of wire on the crystal ami from the crystal cup itself lead another wire direct to the inductance coil where the lead in wire is joined.

This completes the set, and providing the work has been carried out properly you : have rather an element--I- i-'l v<"-<’iver, 'wliieh however

should function quite well for a local station. Next week, the operation of a valve will be dealt with. PROGRAMMES FOR TO-NIGHT. IYA, Auckland.—7.ls to 7.45 p.m.: ■ News and information. 8 p.m.; Chimes; relay of overture from Prince Edward Theatre, Mr. Geo. Poore conductor; quartet, Lyric Quartet, “Dance of the Gnomes” (McDowell); bass solo, Mr Ernest Thomas, “Blow, Blow, Thou Winter Wind” (Ketelby); tenor solo, Mr H- Richards, “Longing for You” (Fisher); soprano solo, Miss A. McGruer, “Cornin’ Thro’ the Rye”: humour, Mr A. McElwain, some humour; operatic scena, Miss A. McGruer and Lyne Quartet, scena from “The Bohemian Giri” (Balfe). 9 p.m.: Weather report; relay from Prince Edward Theatre; quartet, Lyric Quartet, “Girl o’ Mine”; sopano solo, Miss A. McGruer, ‘‘Spring Dropped a Song”; duet, Messrs. McElwain and Thomas, “The Gendarmes” ; tenor solo, Mr A. Ripley “My Molly Dear”; quartet, Lyric Quartet, “Peggy”; humour, Mr. A. McElwain, more humour• bass solo, Mr. E. Thomas, “Hybrias the Cretan” (Elliot); quartet, Lyric Quartet, “Kentucky Babe”; concerted item, Miss A. McGruer and Lyric Quartet, lullaby.

3YA, Christchurch 6.30 p.m.: Children’s session under Uncle Jacki 7.15: Addington stock market reports and news reports. 8: Chimes; relay of orchestral selections from Everybody's Picture Theatre Orchestra under direction of Air. W. J. Jamieson, F.S.M.; bass solo, Mr J. Filer “Drake Goes West” (Sanderson); soprano solo, Miss Mabel Eaglesome “When the Heart is Young (Buck); cornet solo, Mr E- N. Trenbertii, of Woolston Quartet, “ ’Neath Austral Skies” (P. Code) ; tenor solo, Mr E. Rogers, “Lorraine” (Sanderson). 8.30: Talk by Rev. B. Dudley, F.R.A.S., on “Astronomy” ; baritone solo, Mr Jack Mason, “The Lute Player” (Miilitsen); instrumental trio, Mr Woodward’s Instrumental Trio, popular melodies (M.S.S.); bass solo, Mr J. Filer, “Anchored”/ Watson); euphonium solo Mr T- H. Hughes, G. Wilson, F. N. Trenberth and S. Creagh, “Wagner” (Hume); tenor solo, Mr. E. Rogers, “Island of Dreams” (Adams); baritone solo Mr Jack Mason, “The Bells of Clermont Town” (Goodhart); instrumental trio, Mr Woodward’s Instrumental Trio, popular melodies (M.S.S.); bass and tenor duet, Messrs. J. Filer and E. Rogers. ‘‘lhe Rivals” (Hastings); soprano solo. Miss Mabel Eaglesome, “I’m Longing for the Spring” (Morris) ; brass instrumental quartet, Woolston Instrumental Quartet, tone solo, Mr Jack Mason, “For the “Town and Country” (Round); baritone solo, Mr J. Mason; “For the Green” (Lohr); relay of orchestral music from Everybody's.

2BL, SYDNEY-8 n.m.iG.P.O. clock and chimes; Broadcasters’ Topical Chorus ; the Canterbury District Band (bandmaster. Mr Stan Nicholls); broadcast from Baker's Hall, Campsie; Mr Raymond Beattv (basso) ; Broadcasters’ all-sports expert will talk on boxing; Mr Lew James (Jewish comedian); Miss Millie Hughes (soprano); Broadcasters’ Trio; Mr Kyrle Sylvaney (actor-vo-calist) : Miss Millie Hughes and Mr Raymond Beatty; the Newtown Band; Mr Raymond Beatty; Miss Millie Hughes; Broadcasters’ Trio; Mr Yyrle Sylvaney; Mr Lew James. Cec. Morrison and hjs Gloomchasers broadcast from the ballroom of the Bondi Casino. During intervals between dances “Sun” news will be broadcast.

3LO. MELBOURNE—7.3O p.m.: Mr Frank Smiley of Cobb and Co.’s coaches, will speak on “Coaching at Warrnambool 50 Years Ago”; Captain C. H. Peters. “Books. Wise and Otherwise”; Salvation Armv Band; vocal and instrumental items.

4QG. BRISBANE.—From the Tivoli Theatre —8 p.m.: Music bv the Tivoli Operatic Orchestra, conductor. Mr C Groves. From the Studio — 8.30 p.m.: Hawaiian Instrumentalists in selected numbers, and concert programme. 9 p.m.: Metropolitan weather forecast: continuation cf programme. During the night programme a description of the main events will be relayed from the new Speedway Davies Park. The actual times of the dscriptions will be riven from the Studio of 4BG during the evening.