Furuno 1623 - Manual (Page 11)

1. OPERATION
4
1.5 Adjusting Display
Contrast, Brilliance
1. Press the [POWER/BRILL] key
momentarily to show the
brilliance/contrast adjustment window.
CONT: 4
LOW HIGH
BRILL:
LOW HIGH
9
BRILL/CONTRAST
[MODE]: TX/ST-BY
[MENU/ESC] : Exit.
Brilliance/contrast adjustment window
2. Press
◄
or
►
to adjust contrast.
3. Press
▲
or
▼
to adjust brilliance.
4. Press the [MENU/ESC] key to escape.
Note 1: Windows other than menu windows
are erased when there is no operation within
about 10 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 startup screen appears.
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
6.0 nm
2.0
RNG 03.2nm
BRG 60.2
°
TTG 02H21M
EBL - - - .- °
VRM - - - - nm
Location of range and range ring
interval indications
1.7 Receiver Sensitivity
The [GAIN] key adjusts the sensitivity (gain)
of the receiver. It works in precisely the same
manner as the volume control of a broadcast
receiver, amplifying the signals received.
The sensitivity is adjusted automatically
according to sea conditions, and you may
also further adjust it manually to fine tune.
The proper setting is such that the
background noise is just visible on the
screen.
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 consecutively until
the display shown below appears.
GAIN
20
[GAIN] : A/C SEA MENU
[MENU/ESC] : Exit.
AUTO : MODERATE
MANU
Gain adjustment window