The Furuno is a fairly inexpensive RADAR and yet according to you, it is
doing
nearly impossible things.

Joe,
You are correct, it does, but it's good if it can. 80 nano sec. is quick.
Many of the commercial sets cannot.
Steve

"Commodore Joe Redcloud" wrote in message
...
On Thu, 5 Jan 2006 06:41:49 +0100, "Steve Lusardi"

wrote:

Larry,
You brought up a good point, but your reasoning is incorrect. All marine
scanners have a 30 degree verticle radiation pattern, This is too
compensate
for roll and heel.

Furuno 1623: Vertical beamwidth 25 degrees (12.5 degrees above and 12.5
degrees
below horizontal)

Furuno 1623: Pulse length .08 ms (short), .3 ms (medium), .8 ms (long)

They operate by dumping high voltage on
the cathode, which rings the hell out of the cavity. They turn off when
the
cavity decides it no longer is excited and the receiver can not turn on
until there is no more energy being emitted from the magnetron. This is
becoming a very big issue in Europe at the moment. There now is a new
commercial regulation as of Jan. '06 specifically pointed at canal traffic
that stipulates that all new RADAR sets work at 50 meters. For exactly the
reason you mentioned in your post. Now that's tough to do.
Steve


Furuno 1623: Minimum range 22m




Commodore Joe Redcloud