How far do OUR radio signals travel ?

[pizzaguy]

<font color="yellow">Actually the oldest signals are a bit older than that. 1920 was the first commercial broadcast but 23 years earlier in 1897 was established the world's first radio station on the Isle of Wight, England.<br />The question is not how far did our signals travel but how far did our convenient signals travel. The problem for searching electromagnetic signals is that there is a pleiade of them and it is necessary to narrow down the search and that goes for someone on the other side. </font><br /><br />No one will be hearing ANYTHING we "sent" in the years before about 1940 because...<br />1) Power levels (and ERPs) used were of insignificant levels for interstellar communications.<br />2) Frequencies used were usually below the MUF, therefore they did not leave earth, but were trapped (reflected by the ionosphere) here.<br />3) Frequencies used (like they are now for AM/FM/TV broadcast) are well below 1 gHz and the noise level in space is very high in that area of the spectrum: such signals would be masked by noise in short order.<br /><br />Take a look at the noise floor..... <div class="Discussion_UserSignature"> <font size="1"><em>Note to Dr. Henry:  The testosterone shots are working!</em></font> </div>

 

[search]

Meaning convenient signals after 1940 in other words...thanks for the technical information.<br />

 

[pizzaguy]

You're welcome - I tried to say all that without sounding like a know-it-all or coming across as arrogant! <img src="/images/icons/wink.gif" /><br /> <div class="Discussion_UserSignature"> <font size="1"><em>Note to Dr. Henry:  The testosterone shots are working!</em></font> </div>

 

[robnissen]

I personally don't care about how arrogant one sounds, all I care about is accurate information. Posts like your's are the reason I come to this board. Thx.

 

[search]

Not at all. I meant thanks.

 

[pizzaguy]

Got it, guys!<br /><br />This has been posted here many times, but It's worth the read! <div class="Discussion_UserSignature"> <font size="1"><em>Note to Dr. Henry:  The testosterone shots are working!</em></font> </div>

 

[MeteorWayne]

I had not seen that yet pizzaguy, thanks!<br />A very thorough discussion of the subject WITH supporting math and enough of an explanation for the layman.<br />Great reading. <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[search]

Very, very nice.