Radar effectivness

[beryl]

Is there any advantages in having a 4kw as opposed to 2kw antenna
apart from the additional range. Which for me is a unwanted feature.

Will the higher powered unit detect targets in close proximity (less
than a mile) that would possibly have not been detected by the lower
powered unit or is everything just lost in sea clutter.

Has anyone had experience of changing to a more higher power antenna
and the possible advantages.

 

[Ian]

beryl must be edykated coz e writed:

Is there any advantages in having a 4kw as opposed to 2kw antenna
apart from the additional range. Which for me is a unwanted feature.

Will the higher powered unit detect targets in close proximity (less
than a mile) that would possibly have not been detected by the lower
powered unit or is everything just lost in sea clutter.

Has anyone had experience of changing to a more higher power antenna
and the possible advantages.

A bigger, i.e. greater diameter antenna will give a narrower band of
definition but the output power is primarily for range. Also can your "head"
unit operate with an alternate Radome?

 

[Ian]

beryl must be edykated coz e writed:

Yes not a problem for I am buying a complete new system.
The processor board in the present one has gone "pop"
and is past economical repair plus it would not comply
long term with the changing spurious emissions requirements

I am just replacing one for a customer who has had a similar problem, his
current radar is no longer supported by the manufacturer, so it is more
economical to fit a whole new set.

 

[Terry Spragg]

Is there any advantages in having a 4kw as opposed to 2kw antenna
apart from the additional range. Which for me is a unwanted feature.

Will the higher powered unit detect targets in close proximity (less
than a mile) that would possibly have not been detected by the lower
powered unit or is everything just lost in sea clutter.

Has anyone had experience of changing to a more higher power antenna
and the possible advantages.

Range vs noise rejection:

If the antenna is low, it will see less clutter, and will have
shorter range.
If the AE is high, it will see less close in, and see more
including clutter, far away.

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[beryl]

I am just replacing one for a customer who has had a similar problem, his
current radar is no longer supported by the manufacturer, so it is more
economical to fit a whole new set.

And which power rating are you fitting, and what was the thinking
behind the selection.

 

[beryl]

Range vs noise rejection:

If the antenna is low, it will see less clutter, and will have
shorter range.
If the AE is high, it will see less close in, and see more
including clutter, far away.

What would consider optimum height for the antenna when
mainly used on short range, (up to 5 miles) in bad weather conditions.

 

[Matti Raustia]

I put mine about 11 feet off the water. High enough to be well over
our heads in the cockpit, but low enough so sea clutter doesn't bother
a lot. I did this first after using the same kind as my first radar on
a friend's boat. He had it mounted on the mast, about 20 feet up. The
clutter really was a detriment.

I have JRC 1000 mounted about 3 meters (~10 feet) above the water. I can see
big ships at 6-8 nautical miles range and I consider it enough. On the other
hand, I can see little buoys at 0.2 nautical miles and it is enough too. In
general I am very pleased with my radars performance.

matti