Talk:Earth–Moon–Earth communication

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EME is not solely an amateur technique, even these days. Gerry Lynch 17:06, 12 August 2005 (UTC)

-No it isnt, NSA/CSS used a EME (or in Military parlance, CME, communications earth relay) system called TRSSCOM(Technical Research Ship Special Communications) on AGTR "Technical Research" vessels up until the last AGTR was decomissioned in 1969, the problem with it was that the transmitting ship and receiving station at Ft. Meade both had to have the moon in the sky overhead at the same time. 02:37, 3 November 2006 (UTC)

HDTV over EME ?? What do I get wrong ? 17:55, 9 June 2006 (UTC)

Super nice story, but...[edit]

Apollo 13 never touched the moon, aka landed. Ever... so celebrating the 40th anniversary for that is quite impossible: "The second World Moon Bounce Day was April 17, 2010 and coincided with the landing of Apollo 13 on its 40th anniversary." — Preceding unsigned comment added by (talk) 11:21, 3 December 2013 (UTC)


I seriously doubt it, but provide a credible reference and I'll buy it. N8EVV aka Marc W. Abel 04:45, 28 June 2007 (UTC)

I have done some calculations on using a 2MHz wide signal for TV (either analogue or digital) and concluded that it could be possible in the 1.3GHz amateur radio band using high power (1kW) and very high gain dishes (50m or larger). A low priority project is currently under way to arrange for some tests. If using a digital mode it would need to be robust - perhaps more robust than QPSK modulation. G1MFG 10:28, 16 July 2007 (UTC)G1MFG


I'm honestly quite surprised that the article doesn't mention anywhere the NSA/CSS' TRSSCOM system employed on the U.S. Navy's 1960's era "Technical Research" SIGINT/COMINT/ELINT spy ships. It was a fairly successful use of encrypted EME communications to send highly compartmentalized intelligence information back to NSA's analysis unit in Maryland without worrying about interception. (talk) —Preceding undated comment added 20:23, 23 April 2009 (UTC).


This article tends to contradict itself periodically, especially with respect to the current state of the art and modes used. Needs a good rewrite. Worth a note that existing literature supports 5 watts on each end of the link using TVRO antennas at very low bandwidth. N8EVV aka Marc W. Abel 04:51, 28 June 2007 (UTC)

Cool but[edit]

EME sounds cool (though frightening), but I would have liked a sentence or two regarding the fact the moon moves. Are EME antennas moved periodically to point at the moon? Is EME functional when the moon is over the wrong Earth hemisphere? Thanks (talk) 04:24, 16 July 2008 (UTC)

The antenna stack has to be directional in order to exhibit high gain and to reject local noise, so it has to point at the moon. Many hams use motorized antenna positioners and control software which determines the moon position automatically based on time and geographic location of the rig. And, the moon must be visible (or obscured by clouds) by both parties in a communication. WBR, -- (talk) 10:00, 16 August 2008 (UTC)


I corrected the spelling of Libration Fading, adding the missing "r". I think libation fading would be something that occurs at the end of a long night bar hopping, not in EME contacts. RMoribayashi (talk) 08:01, 25 November 2016 (UTC)

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