Ja znam da je preko radio signala slao odredjene poruke ,i kad su ga novinari pitali sta su poruke bile onda je odgovorio "To je izmedju njih i mene ,ako stvarno toliko zelite znati o cemu smo razgovarali sto ne upitate njih."
Posto radio signal putuje brzinom svetlosti u svim pravcima to znaci da do danas sve planete udaljene od nas 80 svetlosnih godina su do sada cule Teslinu poruku .

Ljudi su glupi sto salju signale i odaju lokaciju nase planete ,Strategijski to je katastrofalno .
Jos malo pa ce sve biti digitalno ,nadamo se da nece valjda kasno .

To sto stigne posle 80 svetlosnih godina ionako pokrije sum, mozda negde dodje do kraja suncevog sistema, do druge zvezde ne dopre nista, sve to pokrije svemirsko zracenje, zracenje sunca itd...

To zavisi valjada od njihove tehnologije da registruju signal ,na primer da znaju nase frekvencije i da su udaljeni 72 svetlosne godine oni uopste ne bi imali problema sada da slusaju uzivo prenos od Hitlerovog govora iz 1942 god.

Evo nas SETI program slusa 131 hiljadu svih mogucih frekfencija ,ovaj novi meta analizator moze da monituruje
8.4 miliona kanala na frekvenciji po kanalu od 0.05 herza a njegov naslednik Beta moze da istovremeno prima
250 miliona istovremenih kanala sa rezolucijom od 0.5 herza po kanalu .

Trenutno ima 3 miliona dobrovoljaca ciji privatni kompjuteri kada se nocu ne radi  na njima pomazu analizi ,
mozes cak i ti da se registrujes za to ,ne jede hleba.

Pa recimo mozes i da roknes atomsku bombu na Merkuru pa bi najboljim teleskopom to jedva primetio tamo na Plutonu a kamoli na udaljenoj zvezdi jer je suncevo zracenje milion puta jace. Mozes imati tehnologiju kakvu hoces kad ti radio talasi prekriju signal (koji je ipak dosta slabiji od recimo atomske bombe). Ajde neka vanzemaljska tehnologija do sledece zvezde (u sta sumnjam) ali recimo nekih 20-30 svetlosnih godina, cisto sumnjam. Ujedno, eto na zemlji se sve prebacuje na digitalno pa analogna tehnologija moze u muzej, nece to vise niko koristiti, a proslo eto sto godina od uvodjenja u upotrebu. A ko zna sta koriste neke civilizacije na koje ciljamo, sigurno ne radio talase pa da komuniciraju sa drugim zvezdanim sistemom i da cekaju na odgovor 2-3 i vise godina. A sasvim sigurno ne sede za analognim prijemnicima i osluskuju signale dal ima tamo nekog.


To rade vec desetak godina pa nisu nasli nista 
Inace, nije da ne jede leba, dobro, ne leba bas ali struje sigurno da, ajde dobro, nije nesto puno ali sa druge strane ajde gasi svetlo kad nisi u kuci al ostavi komp da ti drnda ko desetak sijalica. Isto bas i ne znas sasvim tacno koje podatke obradjuju i za cega koriste cloud sistem, mozda se ne bakcu tamo nekim signalima od malih zelenih vec jednostavno razbijaju neke kodove nekih banaka, renderuju neku zahtevnu 3D grafiku, rade neke proracune za koje drmaju lovu i to sve dzabe, ne moraju da prave renderfarm sa stotinama kompova. 

Ti Marado ocigledno ne razlikujes opticke od radio teleskopa.

I svetlo i radio signal je elektromagnetno zracenje, radio teleskop postoji zbog pokrivanja frenkvencija koje opticki teleskop ne moze da vidi pa se na osnovu toga mogu ustanoviti fizicko-hemijska svojstva objekta sto se kroz vidljivi spektar ne vidi. Znaci, ne vidi ni radio teleskop dalje nego opticki, nego samo druge frenkvencije

Vidis da gresis. Razna prasina, dovoljan meteorit ili ko zna, sprecice foton na daljem putu. El, magnetno zracenje ide dalje. Sem toga nama su osetljiviji radio od optickih teleskopa. Radio signal prodje kroz atmosferu i ne rasplini ga toliko Zemljino magnetno polje. Optici teleskop ima povecanje ne vise od 200-300 puta. I to je previse jer atmosfera, njena debljina vazduha prelama svetlo i dolazi do titranja slike. Lakse je otkloniti sum kod radio teleskopa odstranjivanjem odredjene frekfence.

Da bi se opticki ucinio osetljivijim ide se na sto veci precnik ogledala. A to je zeznuto zbog same tezine. Jer i najmanje zakrivljenje, neravnina, unosi gresku u slici. Na Zemlji je najveci bio na Mont Palomaru. Mogao je registrovati odatle upaljenu sibicu na vrhu Ajfelove kule. Naravno ako zanemarimo zakrivljenost Zemlje. Zbog svih tih prepreka se prebacuju u Svemir, orbitu oko Zemlje. Sa radio teleskopima se to ne radi. Mogu se njih 100 spojiti u mrezu i okrenuti prema istoj tacki i time dobiti na puno vecoj osetljivosti.

A to koje signale oni tamo koriste. Ko bi ga znao. Ovde postoji uverenje da bi 21cm-sko zracenje, frekfenca Vodonikovog atoma, bila idealna za komunikaciju po svemiru. Inace se koriste frekfence od 1cm pa do nekoliko metra.

Radio teleskopi mogu otkriti veoma slaba zracenja sa velikih udaljenosti. Njima je i otkriveno Pozadinsko zracenje, na osnovu koga je i procenjena starost Univerzuma.

Predajnik na Vojadzeru, mislim da bese snage 25w. A jos hvatamo taj signal. Taksi radio stanice su otprilike slicne snage pa se dave i guse po gradu.

Tako da kako god okrenes, nije bas tako to sto pricas. 

Pa od otkrica 200 extrasolarnih planeta u ovih 80 svetlosnih godina ,teorijski bi bilo moguce ukoliko imaju
civilizaciju i radio prijemnike da nas cuju okjo 40 do 50 planeta .

Are Neighborhood Aliens Listening to Earth Radio?
Richard A. Lovett
for National Geographic News

The discovery in the mid-1990s of the first planets outside our solar system gave new life to the simmering debate over whether humans are the only intelligent beings in the universe.

By now dozens of these so-called exoplanets have been washed by our radio and television broadcasts.

But is there anyone on the exoplanets to tune in to those shows?

Probably not on the exoplanets we can detect with current instruments. These gas giants have crushingly high gravities and deadly atmospheres.

Still, theories abound that life-supporting "other Earths"—as yet undetectable by astronomers—might exist near such gas giants.

So if there are aliens on other Earths, what are they listening to, and why haven't they replied in kind?

Billions and Billions

One thing that the experts agree on is that the aliens can't be listening to anything much older than Orson Welles's famous 1938 radio broadcast "The War of the Worlds."

(Related news: "'War of the Worlds': Behind the 1938 Radio Show Panic"

"The first radio experiments go back a hundred years," said Seth Shostak, senior astronomer at the SETI (Search for Extraterrestrial Intelligence) Institute in Mountain View, California.

"But they were low power and low frequencies that don't make it into space. You don't get signals that make a serious job of getting out there until the 1930s."

That means that only 40 or 50 of the nearly 200 known exoplanets are close enough to have heard us.

News
Science
Space

Aliens can't hear us, says astronomer.

Fainter broadcasting signals and digital switchover mean Earth will soon be undetectable to extraterrestrials

Robin McKie, Observer science editor

guardian.co.uk, Wednesday 27 January 2012 11.06 GMT
Article history

Aliens are less likely to be able to pick up signals from Earth and make contact. Photograph: Colin Anderson/Getty Images/Blend Images

Human beings are making it harder for extraterrestials to pick up our broadcasts and make contact, the world's leading expert on the search for alien life warned yesterday.

At a special meeting on the search for extraterrestrial intelligence (Seti), the US astronomer Frank Drake – who has been seeking radio signals from alien civilisations for almost 50 years – told scientists that earthlings were making it less likely they would be heard in space.

Astronomers assumed that a standard technique for any alien intelligence trying to pinpoint other civilisations in the galaxy would involve seeking signals from TV, radio and radar broadcasts, Drake told the meeting at the Royal Society in London.

Scientists on Earth have been using this method, without success so far, to find evidence of intelligent aliens. The theory is that elsewhere in the galaxy other civilisations would probably be doing the same.

An example of this interstellar eavesdropping is dramatised in the Jodie Foster film Contact. Based on a novel by the US astronomer Carl Sagan, it tells the story of an alien civilisation that makes contact after picking up TV broadcasts from Earth.

"The trouble is that we are making ourselves more and more difficult to be heard," said Dr Drake. "We are broadcasting in much more efficient ways today and are making our signals fainter and fainter."

In the past, TV and radio programmes were broadcast from huge ground stations that transmitted signals at thousands of watts. These could be picked up relatively easily across the depths of space, astronomers calculated.

Now, most TV and radio programmes are transmitted from satellites that typically use only 75 watts and have aerials pointing toward Earth, rather than into space.

"For good measure, in America we have switched from analogue to digital broadcasting and you are going to do the same in Britain very soon," Drake added. "When you do that, your transmissions will become four times fainter because digital uses less power."

"Very soon we will become undetectable," he said. In short, in space no one will hear us at all.

What is true for humans would probably also be true for aliens, who may already have moved to much more efficient methods of TV and radio broadcasting. Trying to find ET from their favourite shows was going to be harder than we thought, Drake said.

Most scientists at the meeting said they were sure that life existed on other worlds.

Lord Rees, president of the Royal Society and the astronomer royal, said it should soon be possible to detect planets no bigger than Earth orbiting other stars and determine whether they had continents and oceans.

"Although it is a long shot to be able to learn more about any life on them, then it's tremendous progress to be able to get some sort of image of another planet, rather like an Earth, orbiting another star. And were we to find life, even the simplest life, elsewhere that would clearly be one of the great discoveries of the 21st century.

"I suspect there could be life and intelligence out there in forms that we can't conceive. And there could, of course, be forms of intelligence beyond human capacity – beyond as much as we are beyond a chimpanzee."

Predajnik vojadzera je na rubu suncevog sistema, a sta je sa sledecom zvezdom koja je neuporedivo dalje... A signal vojadzera dolazi upravo iz suprotnog pravca sunca, odakle je zracenje manje, a sada koliki je predajnik da se kontaktira vojadzer, to je drugo.
Istovremeno radio koristimo, ovaj analogni, eto tek sto godina ljudske istorije a vec menjamo u digitalni, a rekoh, ko zna sta koriste napredniji, ne verujem radio talase vec nesto brze. Nama sa obzirom na daljinu do koje smo stigli je zanemarljivo kasnjenje signala ali se vec primeti na Marsu. A do sledece zvezde da se telefonira pa ceka odgovor par godina, mnogo zeznuto.

Prepravio sam iznad, nije 24cm nego 21cm. Nesto sam permutovao a zasto, pojma nemam.

Marado, covece, brate, sestro, kamaradu, misteru .. da li ti shvatas da ti pricam o W ... vatima. Da je dovoljno tih nekoliko desetina vati da bi ih uhvatili sa tog rastojanja. A ti pricas koliki je nas predajnik dovoljan za komunikaciju sa istim tim Vojadzerom. Shvati, pricamo o vatima. A predajne radio i tv antene na zemlji su nekoliko kilovata ili desetine i stotine kilovata. Kilovat je 1000 puta jaci od vata.

Astronomska jedinica je prosecna udaljenost Zemlje od Sunca. Oko 150 miliona kilometara. Vojadzer je na oko 119 AJ od Zemlje. Proxima Centauri je na 4,23 sv. god. Sto je oko 286 hiljade i nesto AJ.

Pa ako "cujemo" na toj daljini 25W , sta mislis koliki predajnik je potreban da bi smo uhvatili signal sa Proxime?

Svi naucnici se slazu da je nas signal dospeo bar do 50 sv. god daljine. U tom podrucju se i vrsi intenzivnija pretraga.

Koliko jak predajnik imaju tamo neki, ne znamo.
Da li koriste iste frekfence, ne znamo.
Da li koriste el. magnetne talase, radio emisiju, ne znamo.

Ide se na srecu.

Izvedena je proba neutrinskog prenosa podataka. Za Neutrine nema prepreke. Prolaze kroz planetu kao kroz maslac. Da li koriste takav neki vid transmisije za komunikaciju, ne znamo. Imamo detektore neutrina pod zemljom. Ali jos ne mozemo da to koristimo kao sto koristimo radio signal. Detektujemo ih i nista vise od toga.

Da li koriste neki drugi nacin za komunikaciju u Svemiru, ne znamo.