Re: Re: Long Delayed Echoes
> > From: Robin van Spaandonk <[EMAIL PROTECTED]> > No, the question was, "doesn't anyone listen at radar frequencies, > without a directional antenna?" None that I know.
Re: Re: Long Delayed Echoes
> > From: Robin van Spaandonk <[EMAIL PROTECTED]> > That still doesn't answer my question though. I'm sorry, the question was regarding googling echo returns from the moon?
Re: Re: Long Delayed Echoes
> > From: Robin van Spaandonk <[EMAIL PROTECTED]> > In reply to Terry Blanton's message of Sun, 01 May 2005 09:48:26 > -0400: > Hi, > [snip] > >Because, it will be pointed in a different direction on signal return > >due to the rotation of the earth. > [snip] > ..and thus would not be picked up. Good point. Doesn't anyone > listen on radar frequencies without using directional antennae? Very good. It's amazing how much trouble I have on the SETI list making people understand this. Either ET must be tracking the earth with a directional antenna or ET must be using an isotropic radiator. Note the Nipponese Ham was using 3.5 MHz. Since free space attenuation (dB) is given by: 96.6 + 20 log (F) + 20 log (D) the frequency component forces the use of directional antennae at higher, common radar frequencies.
Re: Re: Long Delayed Echoes
> > From: Robert Brady <[EMAIL PROTECTED]> > Date: 2005/04/29 Fri PM 12:05:36 EDT > To: vortex-l@eskimo.com > Subject: Re: Long Delayed Echoes > > I believe that the delayed echoes are caused by electromagnetic ducting > around the earth. Perhaps, but then, how do you explain the doppler shift?
Re: Re: Long Delayed Echoes
> > From: "Stephen A. Lawrence" <[EMAIL PROTECTED]> > To receive a ham-generated signal 82 light hours from its point of > origin, using ham equipment, seems to me to require that the signal be > focused in some way. He supposedly has the proof; but, "focusing" is a possibility. Imagine you're a point source at the center of a 41 light hour radius reflective sphere.
