Comitato Guglielmo Marconi International - Fondato nel 1995


The following is a more accurate transcription of the G Marconi English recording:
Graeme Ferrero ferrero@dircon.co.uk TNX

"In December 1901 I was able for the first time, by means of stations specially constructed for the purpose, to transmit and receive telegraphic signals right across the Atlantic Ocean, from Poldhu in Cornwall to St John's Newfoundland, a distance of about 1,800 miles.

Early in 1902, during a voyage on the American liner Philadelphia to New York, I was able to receive signals from Poldhu in Cornwall for the whole distance at night time, although during the day the transmission range fell to 700 miles. I was thus able to discover the now well-known fact that wireless signals transmitted by wavelengths of few hundred meters can be received over much greater distances by night than during the hours of daylight.

It was in June 1913 that Dr Leitzner (Meisner?) employed the oscillating valve for the first time as carrier wave generator for transmitting speech between Berlin and Nauen(?), a distance of 23 miles.

My first tests with a valve generator were made in the following year. In March 1914 I had the apparatus installed on an Italian warship at Augusta in Sicily and speech was received on a second vessel. The two ships steamed out to the high seas and for further tests off the Sicilian coast and, consistently, perfect perception was registered over a distance of 35 kilometres, a distance subsequently increased to 70 kilometres with very limited power. Communication was constantly maintained throughout a period of 12 hours, and experiments including periods when signals were transmitted entirely over sea and also when land intervened. One complete wireless installation was also sent to New York, and communication was established between New York and Philadelphia by telephone, working both ways.

On the whole period of war, experiments in wireless telephony were discontinued commercially, and were carried out only in connection with military services, as far as this country was concerned. But in America commercial research continued. At the end of 1915, the American Telephone & Telegraph Company, working in conjunction with the Western Electric Company, succeeded, when conditions were favourable, in transmitting speech from United States naval station at Arlington to the Eiffel Tower station in Paris, a distance of 3,800 miles. On this occasion, over 300 valves (or tubes) were used in the oscillator and modulator circuits.

On the conclusion of the war, it became possible for European countries to resume their tests, and in March 1919, with the object of demonstrating that transatlantic telephony could be achieved using comparatively small power, one-way communication was established and satisfactorily maintained for ten days with Louisbourg(?), in Canada, by transmission from my station at Ballybunnion, Ireland ,using a valve transmitter with only 2.5 kW output from the generator, a wavelength of 3,800 meters, and an aerial 500 feet in height.

In the same year, my assistant, Mr. C.S. Franklin, carried out a short-wave telephony beam test, on very short wavelength, a wavelength of 15 meters, across the English Sea, a distance of 80 miles, and work on this wavelength was continued in 1921 when two-way telephone communication was established between Hendon and Birmingham, a distance of 97 miles, in which case however reflectors or projectors were used.

Then in 1921, following a successful test of duplex telephony on 100 metre wave between Chelmsford and Southend, experimental stations were erected by my engineers at Southwold and Zandvoorst(?), Holland, which worked duplexed across North See, using only 1 kW of energy in the aerial. At Kristiansand, Norway, good quality telephony was received from these stations, both at night and during the day, whilst at Oslo, a distance of 700 miles, very loud and constant signals were received during the night, but the day reception was variable and uncertain.

The year 1920 is memorable for a number of important wireless telephone transmissions which had both news and entertainment value, and thus had the same character that broadcasting has today. To encourage public interest, demonstrations were given to show that no special skill was required to talk into the telephone, and that musical items could be transmitted and satisfactorily received with ease.

In February 1920, a program of vocal and instrumental music, for two half hourly periods each day for a fortnight, was broadcast from the Chelmsford station, using about 5 kW in the aerial, and the same wavelength of 2,800 meters which was being employed by Poldhu for the news broadcast to ships. This was in order to test the range of the transmitter. Amateurs and shipping companies were advised, and asked to send in reports.

Dame Nellie Melba gave her first broadcast in June 1920, from this station, and Malracks Melshaw(?) in July. World-wide interest was aroused by these broadcast concerts, and good reception was reported from distances as far away as Persia and Canada."

Graeme Ferrero ferrero@dircon.co.uk TNX



Vi ricordiamo che i nomi seguiti da ???? sono abbastanza sicuri ( cioe' abbiamo 
verificato con cartina, distanze ecc. ); i nomi preceduti da .... e seguiti 
da ???? sono sicuramente sbagliati o incompleti.
 Qualcuno se possiede piu' testi di noi , puo' fare qualche verifica.





                                        Bologna 25/ 4/ '97

Discorso di Guglielmo Marconi in inglese, ricavato da registrazione 
originale su filo, sul tema della trasmissione della voce ( telefonia via 
radio ) .

Sono esposte le tappe principali dal 1901 ( prima trasmissione di segnali 
morse attraverso l'oceano ) al 1920, nascita della radio broadcasting .

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In december 1901 I was able for the first time by means of stations 
specially constructed for that purpose, to transmit and receive telegraphic 
signals right across the Atlantic Ocean, from Poldhu in Cornwall to St 
John's Newfoundland, a distance of about 1800 miles.

Early 1902 during a voyage on the American liner Philadelphia to New York, I 
was able to receive signals from Poldhu in Cornwall for the whole distance 
at night time, although during the day the transmission range fell to 700 
miles.
I was thus able to discover a now well known fact that wireless signals 
trasmitted by wawelenghts of few hundred meters can be received over much 
greater distances by night than during the hours of daylight.

It was in June 1913 that Dr Leitzner???? employed the oscillating valve for 
the first time as carrier wave generator for transmitting speech between 
Berlin and Nauen, a distance of 23 miles.
My first tests for the valve generators were made in the following year .
In march 1914 I had the operators installed on an Italian warship at 
 Augusta in Sicily and speech was received on a second vessel. The two ships 
steamed out to the high see and for further tests off the Sicilian coast , 
and consistently  perfect perception was registered over a distance of 35 
kilometers, a distance suspectedly increased to 70 Kilometers for very 
limited time  .
Communication was constantly maintained over a period of 12 hours and 
experiments including periods when signals were transmitted entirely over 
see and also when land intervenied .
One complete wireless installation was also sent to New York and 
communication was established between New York and Philadelphia by telephone 
working both ways .

On the whole period of war, experiments in wireless telephony were 
discontinued commercially and were carried out only in connection with 
military services as far as this country was concerned, but in America 
commercial research continued .
At the end of 1915 the American Telephone & Telegraph Company working in 
conjunction with the Western Electric Company succeded , when conditions 
were favourable, in transmiting speech from United States naval station at 
Arlington to the Eiffel tower station in Paris,a distance of 3800 miles.
On this occasion over 300 valves ought to be used in the oscillator and 
modulator circuits.
On the conclusion of the war it became possible for european countries to 
resume their tests and in march 1919 with the object of demonstrating that 
transatlantic telephony could be achieved using comparatively  small power, 
one way communication was established and satisfactorily   maintained for 10 
days with Louisbourg???? in Canada by transmission from an Irish station at 
Ballybunion ,Ireland ,using a valve transmitter with only 2 and a half KW 
output from the generator, a wavelenght of 3800 meters and an aerial 500 
feet in  height.
In the same year my assistant Mr C.S. Franklin carried out a short wave 
telephony beam tests on very short wavelenght , a wavelenght of 15 meters, 
across the English See , a distance of 80 miles  and work on this wavelenght 
was continued on 1921 when two way telephone communication was established 
between Hindon ????? and Birmingham a distance of 97 miles , in which case 
however reflectors or projectors were huge .
Then in 1921 following a successful test of duplex telephony on 100 meter 
wave between ...... Chamsfurth ?? and ..... southen????...... southampton 
???? experimental stations were erected by my engineers at Southwold ???? 
and Zandvoort ????  Holland which were duplexed across North See, using only 
1 KW of energy in the aerial .
At Kristiansund?????  Norway, good quality telephony was received from the 
Stations for that night and during the day ;  plus at Oslo, a distance of 
700 miles ,  very loud and constant signals were received during the night 
but the day reception was variable and uncertain .

The year 1920 is memorable for a number of important wireless telephone 
transmissions which had brought news and entertainment value and this had 
the same character that broadcasting has today.
To encourage public interest, demonstrations were given to show that no 
special skill was required to talk into the telephone and that musical items 
could be transmitted and satisfactorily received with  ease.
In february 1920 a program of popular experimental  music for 2  half hourly 
periods each day for a fortnight was broadcasted  from the 
...chilm...steld????  Station using about 5 KW in the aerial  and the same 
wavelenght of 2800 meters which was been employed by Poldhu for the news 
broadcast to ships ; this was in order to test the range of the transmitter.
Amateurs and shipping companies were adviced in order to sending reports.
..... Deim li Melba ???? gave her first broadcast in june 1920 from this 
station and ......Nora s melshaw ??  in July .
Worldwide interest was arised by  these broadcast concepts and good 
reception was reported from distances as far away as Persia and Canada.
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Testo tradotto dal radioamatore IK4UNI

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