AMATEUR WIRELESS.

Hawera Star, Volume XLVIII, 17 December 1924, Page 8

AMATEUR WIRELESS.

COMUNICATI ON MYTH NEW ZEALAND.

The British amateurs who are experimenting with short-wave wireless transmission, and whose success first directed attention to the • commercial possibilities of the • lower .wave-lengths, achieved another triumph during the week-end. Mr. E. J. Symonus, of Gemirds Cross, whose call sign is 'G2OD, was the first British experimenter to hear a,New Zealand station calling, and also the first to have his'own Morse code messages heard in New Zealand. Air. AY. C. .Goyder, workingthe Mill Hill School set-, with the call sign G2SZ, was the first British amateur to establish two-way communication with New Zealand oil Saturday moniiug. and lie repeated the experiment yesterday. At the present time long'distance tests', are being carried on by amateurs on the short-nave length band around 80 metres by special permission of the Post Office, and they are allowed a power up to 250 watts input iii some cases. Mr.. Symonds is. working -with 105 watts input and Air. Goycler with 200. Mr. Partridge, another amateur in South London, whose call sign is G2.KS, has also been heard in New Zealand, and within the last few days three amateurs here and three in the .Antipodes have been able to bridge a distance of over 12,000 miles with very small power. In every case the conditions have bfeen favourable from about G a.m. to 7 a.m., and it is the small overlap of dusk or darkness ■at each end that has made the communication possible; ns dawn, breaks here the signals die'away. The logs of' Air. Symonds and Air. Goyder are interesting . Last season Air. Symonds established two-way communication with 51 stations in America and Canada, and since October 1 he has added another 17 stations to Iris list, which constitutes a “record;” At G. 30 a.m. on Thursday he heard the New Zealand call' sign of Z4AG for half-an-honr. while that amateur was calling an American station; On-Friday at 6.15 a.m. he sent out- signals on 95" metres, and learnt subsequently. when Air. Goyder -established two way .communication on Saturday, that his signals had, been strongly received by ZIAA, another New Zealand avnhteur, who has since cabled his identity as AYaihemo, Duneclin, New Zealand.

Air, Goyder, who was .formerly at Alill Hill School and is now studying electrical.engineering at the City 'and Guilds Engineering College, South Kensington, went up on Saturday morning to the school set for the first time since May, and- happened. «to hear the call sign .. Z4AA; . He communicated in the Morse code for over half-an-hour from 6.15 a.m. He received a congratulatory message to the Radio Society in Great Britain, was asked to inform 20D. that Z4AA had received him strongly the previous night, and was tokl that -the New Zealand amateur was using 150’ watts, input. Yesterday at 6 ami. he called New Zealand and sent the-follow-ing' message : —“Congratulations to'the Radio Society -of. New Zealand on achievement and 'greetings.—Radio Society of Great Britain.” At 6 15 a.m.. he heard the New Zealand station tap out that the whole of the message had been-' received and that the Prime Minister of New Zealand sent his congratulations. Air; Goyder received New Zealand oil. a two-valve set (o.ne detector and one low -frequency'-valve)-. :!His = aerial is a transmitting one, is 40ft.-high, but electrically, is only 15ft. off the school roof, with a counterpoise earth underneath it, and is unscreened. Air. Symonds is using a super heterodyne set. with four valves, and a wire cage aerial 40ft high, but badly screened with a counterpoise earth 30ft. below the aerial. In both cases telegrams have confirmed the transmissions.