Earth-Moon-Earth is a radio communication which relies on the propagation of radio waves from an earth based transmitter directed via reflection from the surface of the moon back to an earth based receiver. Earth (IPA: , often referred to as the Earth, Terra, or Planet Earth) is the third planet in the solar system in terms of distance from the Sun, and the fifth largest. ... Bulk composition of the Moons mantle and crust estimated, weight percent Oxygen 42. ...

FAQ

As the albedo of the moon is very low (around 12%), and the path loss over the 770,000 kilometre return distance is extreme (around 309 db), this means that high power and high gain antennas must be used. In practice, this limits the use of this technique to the spectrum at VHF and above. Albedo is a ratio of scattered to incident electromagnetic radiation power. ... Path loss: In a communication system, the attenuation undergone by an electromagnetic wave in transit between a transmitter and a receiver. ... To help compare different orders of magnitude, this page lists lengths starting at 108 m (100 Mm or 100,000 km). ... Very high frequency (VHF) is the radio frequency range from 30 MHz to 300 MHz. ...

History

The "moon bounce" technique was developed by the United States Military in the years after World War Two, with the first successful reception of echoes off the moon being carried out at Fort Monmouth, New Jersey on January 10, 1946 by John DeWitt. This was followed by more practical uses, including a teletype link between the naval base at Pearl Harbor, Hawaii and United States Navy headquarters in Washington, DC. In the days before communications satellites, a link free of the vagaries of ionospheric propagation was revolutionary. Shipmen on board the USS Hancock (CV-19) spelling out Moon Relay. ... The armed forces of the United States of America consist of the United States Army United States Navy United States Air Force United States Marine Corps United States Coast Guard Note: The United States Coast Guard has both military and law enforcement functions. ... This article is becoming very long. ... CECOM Crest Fort Monmouth is a United States Army post in Eatontown, New Jersey. ... January 10 is the 10th day of the year in the Gregorian calendar. ... 1946 (MCMXLVI) was a common year starting on Tuesday. ... John Lesesne DeWitt is an American Army general, best known for his role in the internment of Japanese-Americans during World War II. // DeWitt was born at Fort Sidney, Nebraska on January 9, 1880. ... A teleprinter (teletypewriter, teletype or TTY) is a now largely obsolete electro-mechanical typewriter which can be used to communicate typed messages from point to point through a simple electrical communications channel, often just a pair of wires. ... Satellite image of Pearl Harbor. ... USN redirects here. ... Aerial photo (looking NW) of the Washington Monument and the White House in Washington, DC. Washington, D.C., officially the District of Columbia (also known as D.C.; Washington; the Nations Capital; the District; and, historically, the Federal City) is the capital city and administrative district of the United... U.S. military MILSTAR communications satellite A communications satellite (sometimes abbreviated to comsat) is an artificial satellite stationed in space for the purposes of telecommunications using radio at microwave frequencies. ... Radio propagation is a term used to explain how radio waves behave when they are transmitted, or are propagated from one point on the Earth to another. ...

EME was also in use aboard the NSA listening ship Liberty when it was attacked by the Israel Defense Forces during the Six Day War. NSA can stand for: National Security Agency of the USA The British Librarys National Sound Archive This page concerning a three-letter acronym or abbreviation is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Help arrives after the Israeli attack on USS Liberty. ... The Israel Defense Forces (IDF) (Hebrew: צבא ההגנה לישראל , [Army] Force for the Defense of Israel), often abbreviated with the Hebrew acronym צהל Tsahal, alternative English spelling Tzahal, is the name of Israels armed forces, comprising the Israeli Army, the Israeli Air Force and the Israeli Navy. ... The 1967 Arab-Israeli War, also known as the Six-Day War or June War, was fought between Israel and its Arab neighbors Egypt, Jordan, and Syria. ...

Later, the technique was used by non-military commercial users, and the first amateur detection of signals from the moon took place in 1953. 1953 (MCMLIII) was a common year starting on Thursday. ...

Current EME communicatons

Recent advances in digital signal processing have allowed EME contacts, admittedly with low data rate, to take place with powers in the order of 100 Watts and a single Yagi antenna. Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals. ... This page lists examples of the power in watts produced by various different sources of energy. ... A Yagi-Uda antenna. ...

Modulation types and frequencies optimal for EME

VHF

• CW
• WSJT - http://pulsar.princeton.edu/~joe/K1JT/
• SSB
• ATSC (HDTV) is perfectly suited for "Autoranging"
• Narrow FM (15 khz to 5 khz)
• MT63 using SSB or AM

UHF Single-sideband modulation (SSB) is a refinement of the technique of amplitude modulation designed to be more efficient in its use of electrical power and bandwidth. ... The Advanced Television Systems Committee (ATSC) is the group that helped to develop the new digital television standard for the United States, also adopted by Canada, Mexico, and South Korea and being considered by other countries. ... High-definition television (HDTV) means broadcast of television signals with a higher resolution than traditional formats (NTSC, SECAM, PAL) allow. ... // How it works By encoding the data to transmit (what you type on the keyboard) in a complex way, using 64 different modulated tones, the MT63 developer Pawel Jalocha SP9VRC has been able to include a large amount of extra data in the transmission of each character, so that the...

• CW
• WSJT - http://pulsar.princeton.edu/~joe/K1JT/
• SSB
• ATSC (HDTV) is perfectly suited for "Autoranging"
• Narrow FM
• Narrow FM (15 khz to 5 khz)
• MT63 using SSB or AM

Micowave Single-sideband modulation (SSB) is a refinement of the technique of amplitude modulation designed to be more efficient in its use of electrical power and bandwidth. ... The Advanced Television Systems Committee (ATSC) is the group that helped to develop the new digital television standard for the United States, also adopted by Canada, Mexico, and South Korea and being considered by other countries. ... High-definition television (HDTV) means broadcast of television signals with a higher resolution than traditional formats (NTSC, SECAM, PAL) allow. ... // How it works By encoding the data to transmit (what you type on the keyboard) in a complex way, using 64 different modulated tones, the MT63 developer Pawel Jalocha SP9VRC has been able to include a large amount of extra data in the transmission of each character, so that the...

• CW
• SSB

Single-sideband modulation (SSB) is a refinement of the technique of amplitude modulation designed to be more efficient in its use of electrical power and bandwidth. ...

Gallery

A part of 144 MHz EME antenna array at WA6PY in California, USA Image File history File linksMetadata 144MHz_EME.jpg‎ A part of an antenna array used for EME (Moonbounce) amateur radio communication on 144 MHz. ...

A dish antenna for microwave EME work at WA6PY, California, USA Image File history File linksMetadata EME_dish. ...

Other uses

EME also stands for 'Electromagnetic Emissions'.

See also

Information theory A bundle of optical fiber. ...