Re: Radar vs GPS/Sounder

On Tue, 2 Dec 2003 16:59:39 -0500, "Jeff Morris"
<[EMAIL PROTECTED]> wrote:

>An interesting explanation, but this isn't the image I see.  They appear from
>medium sized vessels (tugs, CG, etc).    They are roughly a 90 degree arc of a
>circle centered on my vessel, and intersecting the target.  Thus, the radius
>indicates range, and the position of the arc is the approximate direction.
>Although I always assumed it was something "active" on the target, I'm beginning
>to think it might be entirely my radar.   The fact that the arc is on both sides
>of the target makes me think that my transmitter is radiating small side lobes
>(if that's the correct term) that precede and follow the main beam.  If the
>target is a large reflector, and my gain is high, that might show as the arc.
>
>-jeff

I do see what you describe occasionally with a Raytheon SR 70. I never
have seen the other phenomenon, and I never saw this one with the
previous Furuno 1720. 

I don't think it indicates an  active radar on the target, because I
have had it happen with big rocks. It usually goes away pretty soon.
 



Rodney Myrvaagnes                 J36 Gjo/a

"That idiot Leibniz, who wants to teach me about the infinitesimally small! Has he 
therefore forgotten that I am the wife of Frederick I? How can he imagine that I am 
unacquainted with my own husband?"