WIRELESS TELEPHONY

Dominion, Volume 22, Issue 33, 2 November 1928, Page 11

WIRELESS TELEPHONY

SUCCESSFUL TESTS SYDNEY CONVERSES WITH SCHENECTADY CLEAR RECEPTION (United Press Association.—By Electric Telegraph.—Copyright.) Sydney, November 1. Successful wireless telephony tests were carried out last night, Sydney people conversing with Java and Schenectady. The reception was clear, the speakers exchanging items of news as if talking from one town to another nearby. (Australian Press Association.) Schenectady, October 31. “In view of the fact that 2ME heard us excellently, as it seemed and was confirmed by statements of the Australian speakers, it may be interesting,” says a radio authority, “to point out some important aspects of these experimental conversations. It is necessary that the speakers take up subjects that have immediate connotations to the listeners. The Australians iu this respect were excellent. Their queries about the American elections received an immediate response here. Room echo in Sydney on the microphone made audition here difficult at times. It is further believed that improvements in the Sydney microphone will result in better reception here. “For the purposes of a check-up, the following are the names of the speakers here: —Hitt, wireless operator; Rowland, General Electric Company; Dow, Australian Trade Office; South, of the Associated Press; Geber, of the United Press; Stokes, of the 'New York Times’; Rochester, manager, of Vancouver; Shaw, of tlie Keene, New Hampshire ‘Sentinel’; Hawkins, ‘New York Tribune,’ and Rothman, Australian Press Assocition.

“It was a frosty dawn and most of the speakers had travelled hundreds of miles, leaving their duties, in some instances, reluctantly, but when they started speaking, thev literally trembled with excitement, aud in their anxiety to be heard they literally shouted into the microphone. They were thrilled beyond words, and at the breakfast table afterwards it was the sole subject. The publicity value to Australia was great. Immediately afterward trunk line telephone calls came from American listeners in various parts of the country, stating that they had heard the conversations, which were re-broadcast by W.G.Y., Schenectady. Mr. Dow inquires whether the cooee which he uttered was heard.”

TRANSMISSION ON 10-METRE WAVE-LENGTH

TESTING BEAM AT VARIOUS ANGLES (Australian Press Association.) Hartford (Connecticut), October 31. Radio amateurs in Australia and the United States will sit in on an interesting experience at 2 o’clock in the morning of November 1, Eastern Standard time, when tests of transmission between the two continents will lie made on a 10-metre wavelength. The meetings are sponsored by the American Radio Relay League, and will last one week. The principal difficulty on a 10-metre length is in the angle of the beam, and Mr. E. C. Crossett, of Chicago, has erected a new transmitter at his summer home at Wianno (Massachusetts), from which tests will be made. Instead of the angle of the beam being varied horizontally, the beam is variable on a vertical plane. The direction is on tlie great circle to Australia and it is fixed vertically so as to shoot the beam off on a long tangent practically parallel to the surface of the earth, or to any angle up to the vertical. The angle of the beam will be varied constantly in an attempt to find the angle at which communications may be established with Australia on a regular basis.

MR. O’MEARA’S EXPERIMENTS TWO-WAY COMMUNICATION ESTABLISHED By Telegraph.—Press Association.' Gisborne, November 1. The experimental radio telegraphy on a 10-metre wavelength referred to in the cable this morning follows the experiments conducted successfully during tlie past fortnight by Mr. Ivan O’Meara. Hitherto this short wavelength has been regarded as being of no commercial value, although communication has been previously established between France, America, and across tlie American Continent. Dissatisfied with the previous opinions, Mr. O’Meara carried out further tests. At 7.20 a.m. New Zealand time his 10-metre signals, sent in code, were picked up and decoded by the amateur station OUR, California. A further step was 'readied on Tuesday, when between 1 and 1.30 p.m. botli Mr. O’Meara and Mr. Robert Patty picked up signals from the station 6NV of the Federal Telegraph Company at Paulo Alto, California, at good strength. Two-way communication on ten metres was thus established, although not simultaneously. Mr. O’Meara, however, has created a record for this quarter of the globe by maintaining regular two-way communication with an Adelaide amateur. Mr. O'Meara is continuing the experiments, directing his attention mainly to different times, which he believes has a more important bearing on the question than the angle of the beam referred to in the cable message, lie is confident that it will be only a very short time before regular 10metre communication, which will lie an epoch in radio telegraphy, will be established. BROADCASTING PICTURES DEMONSTRATIONS IN ENGLAND (British Official Wireless.) Rugby, October 31. Special demonstrations took place yesterday of tlie reception of broadcast pictures, when, for tlie first time in England, tlie British Broadcasting

Corporation's Daventry Station transmitted two pictures by means of the Fultograph system. Each was remarkably clear, and demonstrated that the broadcasting of pictures had passed beyond the experimental stage. The first picture was of the King, and was an admirable representation, resembling an ordinary sepia photograph. The tracing of each picture could be watched as the transmission proceeded. The demonstrations took place in Manchester and London, and arrangements have now been made for a series of picture broadcasts to be given regularlv from Loudon, while demonstrations will take place at the principal provincial centres. The receiving instruments are now in production, aud cost about £23 each. PICTURES BY WIRE MELBOURNE-SYDNEY SERVICE Melbourne, November 1. Tlie Postal Department proposes to instal a picture transmission service between Melbourne and Sydney, using (lie telegraph lines. By this means it will bo possible to publish tlie picture of an event happening half an hour curlier in another State. The system will also help the police.