RADIO

Star (Christchurch), Issue 19238, 27 November 1930, Page 4

RADIO

(BY

“ AERIAL”)

NOTES AND NEWS. Mr Oscar Garden. The New Zealand aviator. Mr Oscar Garden, will be heard over the air from Station 2YA at nine o'clock this evenMr Garden arrives in Christchurch on Saturday afternoon, and, according to present arrangements, he will be heard from SYA’s stqdio at nine o’clock on Monday evening. A New Amateur Xinitter. Listeners on the short wave amateur band should be able to hear the new local station 3CK on about SO metres in ’phone work on occasional evfenlngs just now. The new station is owned and operated by Mr Eric Shipley, an amateur whose experience of radio dates away back to those dim and distant days—comparatively—when the crystal (or was it the Branley coherer?) was the “latest” in radio reception! Mr Shipley has now broken into the transmitting game, and is at present deeply engaged in perfecting his ’phone work. He will be glad to receive reports on his transmissions. High-Power Transmission. Engineers in the United States have been testing with 200 kilowatts of aerial power for broadcasting. The transmitter is situated at a radio laboratory a few miles south of Schenectady, where facilities are available for the power requirements of a large number of transmitters. There are four steel aerial towers, three 300 feet high and one 150 feet high, and, in addition, a large number of small masts, between all of which are many different types of aerials. At the main power house are rectifiers capable of supplying 750 kilowatts of direct current at 20,000 volts. The design of apparatus capable of handling 205 kilowatts was preceded by years of exhaustive investigation and a slow progress from low to higher power. Probably the greatest single impetus to tlie art of high-powered broadcasting was the development of the 100-kilowatt water-cooled power valve. Instead of complicating design to produce high power through the medium of many 20kilowatt water-cooled valves, the design was simplified by the use of a few 100kilowatt valves. In the 200-kilowatt transmitter there are six 100-kilowatt power valves. Each is five fe-et long, or seven and a half feet including the water jacket. In order to keep the giant valves of the transmitter properly cooled, it is necessary to circulate fifteen gallons of water per minute through the water jacket surrounding the plate of each valve. For the transmitter proper a flow 1 of 100 gallons per minute is required. ■ This is obtained from a cistern of ap-! proximately 20,000 gallons capacity. On its return from the valves, where it absorbs considerable heat, the water is passed through a radiator unit, where it is cooled by a current of air supplied by a large blower. The water is then returned to the cistern. Protection from dust and other impurities is afforded, and the water continues in use over a long period without replenishment. Special protective devices, have been provided to trip off the power in the ease of valve failure and to give warning to the operator in case of the failure of the water supply. Warsaw’s XSartial Broadcast. To commemorate the tenth anniversary of the dramatic moments of the Bolshevik invasion of Poland, Polskie Radio participated in the celebrations by arranging several studio and outdoor broadcasts recently. The most outstanding items, states a reception report from a British listener, were those- reproducing some of the incidents of the battle of Radzvjnin, on the right bank of the Vistula, about twelve miles from Warsaw. The outdoor part of the transmission was carried out at Rembertow, with the assistance of the military authorities, who co-operated in a practical form. The organisers reproduced, also, some historic scenes at the General Headquarters. The conclusion of the broadcast took the form of a radio play, and included the marching of returning victorious troops through the Warsaw streets, cheered enthusiastically by the inhabitants. Some of these effects were

produced in the station's main studio by actors instructed and assisted by military men. TO-NIGHT’S CONCERTS. IYA, Auckland (329 metres). 7.40; Talk, “Cancer,” Dr E. B. Gunson. S.O; Studio concert by the orchestra and members of the Orpheus Club. 9.30 to 11.0; Dance session. 2TA, Wellington (416 metres). 7.0: News session. 7.40: Lecturette, Mr J. B. Bibby, Dental Division, Department of Health, “Diet and Dental Disease.” 8.0: Wellington Savage Club Orchestra, “Carnival,” “The Grasshopper’s Dance,” “Wellington.” 8.19: Bassbaritone, Savage Wilbur Davies, “Vulcan’s Song.” 8.23: Orchestra, “The Blue Danube,” “Reconciliation,” “Festival.” 8.43; Tenor, Savage Lew Campbell, "The Last Watch.” 8.47: Orchestra. “H.M.S. Pinafore,” “Old Comrades.” 8.59: Weather report and station notices. 9.1: Vocal, Baraldi Trio, “My Love Dwelt in a Northern Land,” “Just a Little Ring.” 9.7: Orchestra, “Scenes Pittoresqute.” 9.27: Bass-baritone, Savage Wilbur Davies, “Monarch of the Storms,” “Out on the Deep.” 9.33: Orchestra, “Bohemian Girl,” “A Thousand and One Nights.” 9.49; Tenor, Savage Lew Campbell, “Come Into the Garden, Maud.” 9.53: Orchestra, “Slavonic Rhapsody,” “Vimy Ridge.” 10.5: Close. 3TA, Cirrißtchurch (306 metres). 7.30: Talk, Mr J. G. M’Kay, Fields Instructor, Department of Agriculture, “Wheat Certification.” 8.0: Special relay from the Radiant Hall of third concert programme of season of the Christchurch Orchestral Society (conductor, Professor Oddone Savini; leader of orchestra, Mr T. B. Riordan). Tone po»erti, “In Memoriam” CR. A. I-lorne, arr. Arthur Lilly, A.R.-C.0.); symphony, “Allegro and Finale” from “Third Symphony” (Mendelssohn); baritone, Mr W. Twomey, aria, “O Promise of a. Joy Divine” (Massenet), from “The King of Lahore”; orchestral, “Danse Macabre” (Saint-Saens); return to studio for weather report and announcements. Continuation of relay from the Radiant Hall—Overture, “The Merry Wives of Windsor” (Nicolai); suiOe, “Sea Pieces” (Macdowell); baritone, Mr W. Twomey, “Pagan” (Lohr). “Indian Serenade”; selection, “Madame Butterfly” (Puccini): march, “Military March” from “Otello* (Coleridge-Taylor). Close. 4YA, Dunedin. Silent day.