constellation Hercules
In about 26000 year.
In 1974 by the worlds largest radio telescope at Arecibo in Puerto Rico.
AM means Amplitude(=height) modulation, so the frequency stays the same and the message is coded into variations of the strength of the signal. FM stands for Frequency modulation. Here the strength of the signal stays the same and the message is coded into changes in frequency instead.
The first radio message was sent by Guglielmo Marconi in 1895. He successfully transmitted a radio signal approximately 1.5 miles across Salisbury Plain in England.
The first Christmas message was in 1932 by George V on the radio. The first televised Christmas message was in 1957 by Queen Elizabeth II.
GPS does not use internet, it uses a constellation of US Airforce satellites that transmit coded radio messages. A GPS receiver picking up the radio messages from at least 4 of these satellites can decode them and determine latitude, longitude, altitude, and UTC time with great accuracy.
First Christmas message broacast by a monarch on the radio was King George V, 1932. First TV message: Queen Elizabeth II, 1957.
AM means Amplitude(=height) modulation, so the frequency stays the same and the message is coded into variations of the strength of the signal. FM stands for Frequency modulation. Here the strength of the signal stays the same and the message is coded into changes in frequency instead.
King George the Fifth - on radio.
radio useful the message so radio that is interast the new message
From 1952, the Queen's Christmas message has been televised in some form. From 1952 (her first message) it was broadcast in addition to radio on TV with sound only. In 1957, the first full television broadcast of the message was made.
Guglielmo Marconi invented the radio telegraph system