Jump to content

Talk:Earth–Moon–Earth communication: Difference between revisions

Page contents not supported in other languages.
From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
→‎Cool but: new section
Line 21: Line 21:


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 [[Special:Contributions/192.114.175.2|192.114.175.2]] ([[User talk:192.114.175.2|talk]]) 04:24, 16 July 2008 (UTC)
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 [[Special:Contributions/192.114.175.2|192.114.175.2]] ([[User talk:192.114.175.2|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, --[[Special:Contributions/77.122.219.237|77.122.219.237]] ([[User talk:77.122.219.237|talk]]) 10:00, 16 August 2008 (UTC)

Revision as of 10:00, 16 August 2008

WikiProject iconAmateur radio Start‑class Mid‑importance
WikiProject iconThis article is within the scope of WikiProject Amateur radio, which collaborates on articles related to amateur radio technology, organizations, and activities. If you would like to participate, you can edit the article attached to this page, or visit the project page, where you can join the project and/or contribute to the discussion.Amateur radioWikipedia:WikiProject Amateur radioTemplate:WikiProject Amateur radioamateur radio articles
StartThis article has been rated as Start-class on Wikipedia's content assessment scale.
MidThis article has been rated as Mid-importance on the project's importance scale.
To-do list:

Improve to GA-Class:

Expand and improve:

Create:

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

-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. 68.202.63.146 02:37, 3 November 2006 (UTC)[reply]

HDTV over EME ?? What do I get wrong ? 84.129.187.249 17:55, 9 June 2006 (UTC)[reply]

ATSC

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)[reply]

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[reply]

Cleanup

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)[reply]

Cool but

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 192.114.175.2 (talk) 04:24, 16 July 2008 (UTC)[reply]

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, --77.122.219.237 (talk) 10:00, 16 August 2008 (UTC)[reply]

Retrieved from "https://en.wikipedia.org/w/index.php?title=Talk:Earth–Moon–Earth_communication&oldid=232287521"