History of wireless telegraphy and broadcasting in Australia/Topical/Biographies/Harold Dunbar Walsh

Harold Dunbar Walsh Potted Biography Harold Dunbar Walsh Comprehensive Biography A comprehensive biography of Harold Dunbar Walsh has not yet been prepared for this Wikibook, however the following resources have been assembled in preparation: Research - Harold Dunbar Walsh - Summary of research to date Transcriptions and Notes - Harold Dunbar Walsh - More than 10 transcriptions (Reads like a biography) Photos, QSL cards and other graphics - Harold Dunbar Walsh - Nothing uploaded as yet, but a few photos available in Trove and a single QSL held in the NFSA QSL collection Incubator of Wikipedia Article on Harold Dunbar Walsh - Coming real soon now! Key internet links: First report of Walsh on-air as 4HW ITEMS OF INTEREST. Another experimental station, call Sign "4HW" and operated by Mr. Harold D. Walsh, has been added to the list of stations operating in Queensland. Mr. Walsh informs us that he is working almost nightly on 240 metres, and is getting excellent reports as to volume and modulation. Mr. Walsh, however, states that as not many listen on 240 metres, very few have heard his station up to the present, not knowing that it is operating. He is working C.W. and telephony, and will be pleased to work with any other licensed experimenter, and to receive reports from any district stations who hear this station. "4HW" is still in the experimental stages, and for this reason the operator is anxious to receive reports. The station is situated on the top of the premises of Messrs. G. O. Wills and Sons, Ltd., 110 Elizabeth Street, Brisbane.http://nla.gov.au/nla.news-article20984950 ITEMS OF INTEREST. The Brisbane Courier 21,180 Queensland, Australia 11 December 1925 5 July 2025 14 National Library of Australia Walsh getting serious about amateur broadcasting PRIVATE STATION. LOCAL BROADCASTING. On Monday and Wednesday nights listeners-in on low wave lengths heard 4HW, Brisbane, broadcasting gramophone selections and recitations. This proved to be a private set, owned and operated by Mr. H. D. Walsh, from the premises of H. O. Wills, Elizabeth-street, where the necessary apparatus was installed by him. Mr. Walsh stated that he had received notifications from Sydney, Southport, Toowoomba, Redcliffe, and other places that he had been picked up; but only those working a low wave length (he was working 240) got the calls or those knowing he was broadcasted who specially tuned in. Further broadcasting will take place on Saturday and Sunday. It may be mentioned that one operator, on a crystal set, with no extra aids, got Mr. Walsh's programme on Monday night between items by 4QG, and tuned in again on Wednesday night.http://nla.gov.au/nla.news-article220621833 PRIVATE STATION The Daily Mail 7464 Queensland, Australia 30 January 1926 6 July 2025 17 National Library of Australia Brisbane Daily Mail journalist visits Walsh's 4HW and reports on the facilities A LOCAL STATION. EXPERIMENTER AT WORK. An invitation to inspect the experimental transmitting station operated by Mr. H. D. Walsh was cordially accepted by the writer, and resulted in a very pleasant half hour being spent in this enthusiast's company. Mr. Walsh is anxious to have reports from any listener who happens to hear him working, and would be pleased to carry out tests with other amateurs who have transmitting stations. Report have been received from 2GR, Sydney, Toowoomba, and other far-reaching places, where experimenters have received telephony and telegraph signals from him with exceptionally good results. The station's call letters are 4HW, and it operates on a wave length of 240 metres. Transmission usually takes place from 8 p.m. to 10.30 p.m. on Saturdays and Sundays; occasionally on week nights at the same time, and frequently at midday from 1.30 p.m. to 2 p.m. An Armstrong tuned plate circuit, employing Heising modulation on choke control is used. The speech from the microphone is first amplified by means of a speech amplifier (U.V.199) before being applied to the grid of the modulator valve. Both modulator and oscillator valves are U.V.202 type. The filament current is supplied from a 10 volt accumulator, and the plate voltage from a 600 volt D.C., generator belt driven from a 1 h.p. motor. Meters are provided to indicate radiation, plate voltage, plate current, filament voltage, and filament current. Great credit is due to Mr. Walsh, and it must be admitted that the broadcast listener of today owes his thanks to pioneers such as he. Similar efforts in other parts of the world are directly responsible for the present day success in broadcasting, and undoubtedly perseverance will still further tend to improve its quality.http://nla.gov.au/nla.news-article220625706 A 'LOCAL STATION The Daily Mail 7470 Queensland, Australia 6 February 1926 6 July 2025 17 National Library of Australia References