(meteorobs) a strong return

[Paul Goelz]

At 11:22 AM 1/18/2013, you wrote:
>When I looked at it first upper and lower
>sidebands with a carrier between going
>top to bottom.
>
>But that is the completely wrong interpretation.
>
>The frequency is left to right not up and down.
>Time is up and down.
>I don't see any carrier with this interpretation.
>
>I do see a somewhat broad in frequency energy which
>which changes in timed from low, high, and low amplitude.
>
>Larry

No, the X axis (horizontal) is the time axis.  Time increases going 
right to left.  Frequency is the Y axis (vertical).  This is the same 
way I display meteor returns in Spectrum Lab.

The portion of the display I was interpreting as the "carrier" is the 
center area between the two large "blobs", centered around 
1420Hz.  The event looks like it began at about 03:07:20 UTC, near as 
I can tell.

Again, I'm no expert and I'll accept the interpretation that it was a 
meteor.  But the display looks nothing like what I see here tuned 
1KHz away from a video carrier, even for a VERY strong meteor 
echo.  Even very strong overdense returns that last for long periods 
almost always show an obvious bias above or below the residual 
carrier.  I don't recall ever seeing one with symmetrical returns 
like that.  Or is there perhaps subtle detail that was lost to JPG 
compression?

Paul


Paul Goelz
pgoelz at comcast.net
Rochester Hills, MI
www.pgoelz.com