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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 .
----------------------------------------------------------------------------
----------------------------------------
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.
............................................................................
............................................................................
.................
Testo tradotto dal radioamatore IK4UNI
Per
contattarci, scrivete alla redazione di radiomarconi Grazie.
  
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