Re: Radar vs GPS/Sounder

On Wed, 03 Dec 2003 19:44:00 GMT, Bruce  in Alaska <[EMAIL PROTECTED]>
wrote:

>In article <[EMAIL PROTECTED]>,
> Rodney Myrvaagnes <[EMAIL PROTECTED]> wrote:
>
>> 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.
>
>What this seems to be is Magnitron Double-Pulsing.  This is where,
>as the Magnitron ages, and the Modulator Parts age, they get into
>a multiple pulse state, and produce a very ragged and multiple peaked
>pulse, that shows up as multiple echos in near vacinity of a REAL Target.
>The fix for this is, to replace the Magnitron, and the Pulse Forming 
>Capacitors in the modulator. Not usually found in Noncommercial Marine
>Service, because these units typically die of mechanical age, long 
>before the electronics age out.  
>
I doubt that. This is the new replacement for an ancient Furuno that
never did it.


>Well se what "Me" has to say on the subject.
>
>
>Bruce in alaska




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?"