I was wondering, what the signal from Earth would look like, if it were observed by similar technology form 20,50,70, light yrs away.

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Supposedly our first real transmissions were of Hitler and the 1936 Olympic games.

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In a rich man's house there is no place to spit but his face.
Diogenes Of Sinope

I guess what I was trying to ask, is that if there was a civilisation 20+ light years away, with a similar set up to SETI, would we be observable? Would we stand out from the background? What would it look like on my screen saver?

Most scientists currently don't think our artificially created radio signals are strong enough to be detected more than a few (less than ten) light years out. By that point the radio signals would be so weak they would not be descernable in the background noise. I think it is more likely that analysis of the chemical spectrum from earth would reveal compounds that do not occur naturally.

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Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.

Thank You!

"The term wireless telegraphy is a historical term used today to apply to early radio telegraph communications techniques and practices, particularly those used during the first three decades of radio (1887 to 1920) before the term radio came into use."

Sorry for the wiki quote, but I am just trying to decide if burning out my CPU/GPU, is worth it if our own signals cannot be detected by our own technology, within an acceptable period of time/space.

In September 1974 the Arecibo Radiotelescope was used to send a radio message in the direction of the M13 globular cluster, which is 25000 light years away. The message was launched at a wavelength of 12.6 cm (2381 MHz)but I have no data about its power.The rate was 80 bits/s.It is known as the Arecibo message, so maybe Google has some more information. Even the Russians made something similar but I cannot remember where and when,
Tullio

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I think back then we were overly optimistic about how far even a directed radio signal could travel and be detected. But I think now with the two Voyagers out at the edge of the sun's influence and knowing (a) how strong their transmitters are and (b) how weak the signals that NASA is receiving are, it can be calculated how far a signal of a given strength can reach.

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Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.

...It is known as the Arecibo message, so maybe Google has some more information. Even the Russians made something similar but I cannot remember where and when,
Tullio

Transmission of radio signals into space took place in the 1999,2001,2003,2008, using 70-meter radio-telescope in Evpatoria (Crimea, Ukraine).
This is my country and it is not Russia ... Details, look at this link http://en.wikipedia.org/wiki/Active_SETI and http://en.wikipedia.org/wiki/Teen_Age_Message
In addition, Deep Space Network, in the direction at the Polaris, transferred the song "Across the Universe" The Beatles... :)
"In February 2008, Nasa sent the Beatles song, Across the Universe, across the universe. Pointing the telescopes in its Deep Space Network towards the north star, Polaris, astronomers played out their short cosmic DJ set, hoping that it might be heard by intelligent aliens during its 430-year journey to the star..." http://www.guardian.co.uk/science/2010/apr/30/stephen-hawking-right-aliens
Also, transmission radio-messages into space can also be transferred on a commercial basis. Recently, from Evpatoria, was transferred to message:
"We people of Earth and do not want War" (~ 20 000 €). In this year, they are planning something too... Is this good? I don't know ... :(

It all depend on math or scientific levels of specific civilization. If any alien civilization that have reached beyond quantum computing or any that higher level of advancement let's say 10 times higher than us, it is no problem for them to filter out cosmic noise and determine which signal is from where and possibly to translate the intent of the signal.

What we currently managed to learn about space is likely only 5% detectable matter and we managed to develop numerious science categories to learn that 5%. And we have no idea what kind of additional science is needed to handle remaining undetected dark matter and energy universe. Which means tons of knowledge levels unknown for our current scientific level.

Even the big bang theory itself is only based on that 5% part of the universe knowledge and let's say if we begin to learn maybe 30% of universe then big bang theory might be totally denied just like earth exists on top of 3 elephants theory 2-3 centuries ago.

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Mandtugai!