[?]uplex Telephony

Radio Record, Volume III, Issue 5, 16 August 1929, Page 31

[?]uplex Telephony

eel Some I nteresting Notes ME. A. P, Morrison (Brooklyn) reports having heard wireless duplex telephony between New York, London, and Paris on Sunday, August 4, between 12,30 a.m. and 2.30 p.m. New York was conversing with France between 12.80 a.m. and 1 p.m., New York working on 20 metres and Paris aproximately 22 metres. Conversation. was of a private nature. The Americin end mentioned he was speaking from Seventh Street, New York, both sides of the conversation was heard quite well, speech being quite audible. New York was heapd to call London

a ‘little after 2 pm., but the writer failed to find the London station, although America evidently was receiving him quite well. Conversation was carried on until 2.30 p.m. New Zealand time, when New York closed -down. ‘I have heard duplex telephony be- ' tween eight different countries, namely, tests between Australia and Java and Suva, Australia and America, Germany and Australia, America and Java, Germany and America, Germany and Buenos Aires, America and France, Holland and Jaya, and America and _ England, and last night, Sunday 4th, _ America calling the Graf Zeppelin by wireless telephony on 46 metres, so the above gees to show how far advanced duplex telephony is becoming. Any country in' the world using wave transmissions are heard here in New Zealand, The higher powered stations, such as America and Holland, are 100 per cent, readable. A great number seem to think that shortwave reception is a jumble of: distorted music and speech, but such is not the case. Musical programmes are to be heard from many parts of the world, and it-is not always necessary to sit up. till the small hours of the morning to hear them. To you who desire jazz musie, tune inte America, where you will hear the latest, but America is not all jazz as people sometime imagine. Some of the finest music and singing I have heard has come through the American stations, and all Americans do not sing through the nose. Saturday afternoon our old friend, POJ, Holland, puts over a special for New Zealand and Australia, and quite an enjoyable programme of music. Russia also renders some fine music and singing Then again there is 5SW, Chelmsford, Bngland, if you wish for a little music while having breakfast you can tune into that station providing the ripple and Morse is not interfering. I HAVE mentioned a few of the main S.W. stations, but I might state when sitting down to tune a short-wave receiver you never know who you will receive for new stations are always coming on the air, It is quite possible you may like boxing as a sport; J have been lucky enough to hear quite a number of world champions described. Of course 99 per cent, are decided in America, and most contests have come across very well. ALTHOUGH I do a great deal in short-wave listening I do not forget we have a local station, and think it was above the odds that the football descriptions were stopped. Last Saturday, on the relay from the Park, I was \.,ishing a Graf Zeppelin would come over and take that Old Boy barracker up to the King Country. Cannot Henry Ford put a silencer on the market? If space will permit I would like to say a little on D.X. reception on the B.C. band. No doubt I am a little late in mentioning. the subject. A little time ago a young D.X. enthusiast sent his log into "Radio Record," and a week or so afterwards his log was questioned. Why I do not know. Any old radio enthusiast will bear me out in this. As far back as 1925 listeners here -in New Zealand were bringing in KGO, Califortiia, using only a onevalve outfit (am J not right, Graytown?) and even then one had to have about a dozen witnesses of a reception |

in order to convince doubters. To go’ one better, America was: tuned in by using an inside antenna on a one-valve outfit? I witnessed this reception myself with three others, so why question anyone with a four-valve set? Why, with a set like that orie should be able to bring in both the North and South Poles, with a coup'e of Byrd expeditions igcluded. There lives in New York a. young lady by the name of Jannie Millen, who is a cripple and confined to her bed. She ‘has a one-valve set and her list of stations logged to date. is 593, two Australians at that, and she is the proud possessor of a handome cup presented to her by’ a Ohicago radio manufacturing firm. Yseemz, Sydney, has been heard’ conducting duplex telephony tests: with England, but to-night, August 6, is the first time I have heard the British station. At 530.pm. GBX, Rugby, was heard ¢alling 2MB; modulation good, strength R7 to 8, wave 27 metres. The -Jatest American eallbook for 8.W. stations gives the Rugby station call as GBS.