> > But that is changing fast, Drake says. More and more television is now
> > delivered by cable, with no radio-frequency leakage to space, and by
> > direct-broadcast satellites that put out just 20 watts per channel, all
> > efficiently directed straight down the intended areas on the Earth's
> > So from the point of view of being detected through such inadvertent
> > broadcasts, the longevity of humanity's detectability may be just 100
> I don't buy it. Even assuming that television transmitters disappear, there's
> still a lot of additional radio transmissions. For example, what about all the
> 100,000 watt AM and FM radio stations? What about cell phone towers?
> I don't know my physics for this, but would one million cell phones with one
> watt transmitters be equivalent to a 1 Megawatt TV tower for SETI purposes?
> If anything, I think the amount of radio transmissions coming from earth have
> increased greatly in the last few years, with the increase in cell phone and
> wireless networking usage.
> Kevin Lowey - University of Saskatchewan
> Life is what happens to you while you're busy making other plans - John Lennon
>Almost every automobile out there has carbon brushes in it running on copper slip rings. This must create an incredible amount of RF noise. Frankly, I'm surprised that we can hear anything in space at all. Unless this world comes to a technological standstill,I don't think that a lack of deliberate radio transmissions will be a problem.
We are a noisy people. Hear us!