Getting The Best Radar Picture; Gain Controls - Raymarine H6 Owner's Manual

81238_1.book Page 58 Thursday, September 16, 2004 2:49 PM
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Getting the best radar picture

Whilst the H6 radar automatically adjusts most of its settings, you may get a
clearer radar picture by minimizing the effects of false or multiple echoes and
clarifying target presentation by using the following controls:

Gain controls

To use the gain functions:
1. Click Controls/Gain. The gain softkeys are displayed.
2. Click on the softkey for control options.
3. Adjust the settings as necessary.
4. When you have finished, click the
FTC
You can use the Fast Time Constant (FTC) function to remove areas of clutter at a
distance from your boat. It should be used in conjunction with the RAIN function
to obtain the best results.
When the FTC function is turned up, only the leading edge of large (rain clutter)
echoes is shown, while the effect on smaller (boat) echoes is slight. This means
that you can also use the function on shorter ranges to distinguish between two
very close echoes on the same bearing, which may otherwise merge and appear
as one echo.
With the FTC function set high, the receiver is made less sensitive, and there is a
reduction of background noise and fill-in returns from land and large targets. You
should therefore set the control to low (or Off) when its use is not required.
The effects of false echoes and clutter can be reduced by
using the GAIN softkey and its associated controls to make
the overall picture clearer. The AUTO settings usually give
the best results although you can adjust these settings if
required.
If you use manual settings they are retained when the radar
is set to standby or if you exit H6.
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