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Re: Useless questions



Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "Paul Nicholson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <paul-at-abelian.demon.co.uk>
> 
> Jim, Ed, All,
> 
> I wasn't thinking of trying to form any sort of an image with the
> radar, just hoping the radar would 'see' an overall reflection from
> a sphere of ionisation around the topload. Then
> a) The amplitude of the return would give info about the size
> and/or density of the ionisation - we could see how quickly it
> forms, and try to observe its persistence between cycles/bangs.
> b) Observe the surface of the 'ionisation sphere' move towards/away
> from the radar by looking for doppler-induced sidebands - the line
> width of the return would tell us how fast it was moving, and the
> homodyne is perfect for that, isn't it?  You'd tap into it right at
> the detector for max BW.
> 
> As for interference, I don't know.  I'd guess that at 10Ghz you'd be
> up above most of the hash.  You'd need to take firm action to
> prevent the coil RF from getting into the radar DC supply, etc, eg
> battery powered, faraday cage, with small window for the radar to
> see out through?
> --
> Paul Nicholson
> --

	I'm sure that a) is indeed true.  As for b) I can't see any way that
the relatively low frequency doppler component of an echo from something
as turbulent as streamers could be separated from the background noise. 
That's where a wide-band pulsed system could probably be used, if one
were available.

Ed