NorthStar Navigation Multi-Function Unit M84 - Manual (Page 64)

Northstar M121/M84 Installation and Operation Manual 63
18-2 Radar modes
There are four radar modes:
• Disabled. This saves on power consumption
and magnetron usage. If the radar is
disabled, it has to warm up and enter
standby mode before it can start
transmitting.
• Warming. The radar on and is warming up.
This can take up to 90 seconds, depending
on your scanner type.
18-3 Enabling the radar functionality
When the radar is enabled, it will turn on, warm
up, and enter standby mode. The different radar
modes are explained in Section 18-2.
To enable the radar functionality:
1 Press
MENU
twice to display the Setup menu,
then select System .
2 Set Radar to .
• Standby. The radar is on and is warmed up. It
is ready to start transmitting immediately.
• Transmitting. The radar is actively sending
and receiving microwave radio pulses. An
open array will be rotating.
If you want to save on power but be able to
start transmitting immediately, use standby
mode.
3 The radar immediately turns on and enters
warm-up mode. A message shows how long
this will take.
4 When the warm-up period is complete, the
radar enters standby mode and is ready to
transmit. To start the radar transmitting, see
Section 18-4.
18-4 Selecting standby mode or transmit mode
You can quickly change between these two
modes.
18-5 Disabling the radar functionality
1 Press
MENU
twice to display the Setup menu,
then select System .
2 Set Radar to .
1. From the radar window, press
MENU
and set
the Transmit option to (transmit mode) or
(standby mode).
3 A warning message appears. If you are
sure that you want to disable the radar
functionality, select
Yes.
4 The radar enters disabled mode
immediately.
18-6 Adjusting the quality of the radar window
Common problems that can degrade the
quality of the radar window include:
• sea clutter
• rain clutter
• false echoes (sometimes called ghost
echoes) and background noise
• side lobe patterns (false echoes that appear
as an arc or a broken arc)
• shadows (blind spots)
• multiple echoes off the same object
• incorrect threshold setting
If the radar is installed at a suitable height and
in a suitable location on your boat, side lobe
patterns and shadows (blind spots) caused
by obstructions such as funnels or masts will
be minimized. If you’re having problems with