Choosing The Range; Receiver Sensitivity - Furuno 1623 Operator's Manual

Note 1: Windows other than those on menus
are erased when there is no operation within
about seven seconds.
Note 2: When the power is reapplied after
turning off the equipment with minimum
brilliance, the radar starts up with minimum
brilliance, after the initial start up. Adjust the
brilliance as necessary.

1.6 Choosing the Range

The range selected automatically determines
the range ring interval, the number of range
rings and pulse repetition rate.
Press the [RANGE+] or [RANGE-] key to
select a range. The range and range ring
interval appear at the top left corner on the
screen.
Range
Range ring
interval
Location of range and range ring
interval indications

1.7 Receiver Sensitivity

The [GAIN] key adjusts the sensitivity of the
receiver. It works in precisely the same
manner as the volume control of a broadcast
receiver, amplifying the signals received.
You can adjust the sensitivity manually, or let
the unit do it automatically. In either case, the
proper setting is such that the background
noise is just visible on the screen. For manual
adjustment, use the highest range since the
background noise is clearer.
6.0
nm
2.0
RNG 03.2nm
BRG 60.2°
TTG: 02H21M
If you set up for too little sensitivity, weak
echoes may be missed. On the other hand
excessive sensitivity yields too much
background noise; weak targets may be
missed because of the poor contrast between
desired echoes and the background noise on
the display.
1. Press the [GAIN] key once or twice to
show the display below.
AUTO : MODERATE
MANU
[GAIN] : A/C SEA MENU
[MENU/ESC] : EXIT
Gain adjustment window
2. Use ▲ or ▼ to choose AUTO or MANU
as appropriate.
3. Do one of the following depending on the
choice you made at step 2.
Automatic adjustment
a) Press ► to open the automatic gain
options window.
ROUGH
MODERATE
CALM
Automatic gain options
b) Choose ROUGH, MODERATE or
CALM depending on sea conditions.
c) Press ◄ to close the window.
Manual adjustment
While observing the screen and the tuning
bar, use ◄ or ► to set the gain. The
setting range is 0-100.
4. Press the [MENU/ESC] key to finish.
4
GAIN
20