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Furuno 1830 - CRT Brightness, Tuning, and Range;Bearing Measurement

Furuno 1830
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Adjusting
the
Brightness
of
the
CRT
MtU-
(M]
touchpad
is
used
to
adjust
the
brightness
of
the
CRT.
As
a
general
rule
of
thumb,
choose
a
brighter
setting
for
daytime
use,
and
a
lower
setting
for
nighttime
operation.
However,
note
that
with
too
Httle
brilliRnce
the
display
becjomes
diffioult
to
eee,
and
exooeoivc
brilHance
decreases
the
Hfe
of
the
CRT.
i'here
are
tour
levels
of
illumination:
dim,
medium,
medium-bright,
and
bright.
Each
time
the
[^|
touchpad
is
pressed
the
level
will
change
in
the
above
sequenoe.
The
status
of
this
touchpad
defaults
to
medium-b
right
when
turning
on
the
system.
Tune
Control
Adjustinent
This
Control
tunes
the
receiver
to
the
exact
frequency
of
the
transmitter.
For
the
first
30
minutes
of
operation
the
tuning
should
be
checked
periodically
to
ensure
that
the
radar
is
operating
properly.
Readjustment
after
Uie
first
30
uiiiiutes
is
normally
not.
requlred.
The
tuning
is
made
by
moving
the
control
slowly
through
the
limits
of
its
travel
tn
find
the
pnaitinn
where
a
oomparatively
weak
long
range
echo
is
discerned
on
the
screen
with
maximum
definition.
The
tuning
condition
can
be
monitored
by
observing
the
tuning
bar
at
the
top
right
oorner
of
the
CRT.
The
best
tuning
position
is
usually
found
at
a
point
close
to
where
the
Control
is
advanced
of
its
travel
and
the
greatest
number
of
tuning
bars
are
displayed.
MRASURING
RANGE
AND
BEARING
In
the
basic
radar
system
your
ship
is
in
the
center
of
the
screen,
and
any
target
received
is
displayed
in
a
map-Hke
projcction
throughout
300“.
This
allowB
the
bearing
and
range
from
your
boat
to
a
target
appearing
on
the
screen
to
be
measured.
Range
is
measured
vrith
the
fixed
range
rings
(rough
estimate),
the
cursor
(accurate
and
easy,
but
temporary
method)
or
the
Variable
Range
Marker
(VKM;
accurate
and
continuous
indication
of
its
range).
Bearing
is
metisiired
with
the
cursor
(easy,
but
temporary
method)
or
the
Electronic
Bearing
Line
(EBL;
continuous
indication
of
its
bearing).
If
you
wanl
to
know
momentarily
the
range
and
the
bearing
to
a
target
pip,
you
may
use
the
cursor
^th
the
trackball.
To
know
and
indicate
the
data
continuoualy.
press
the
[®]
and
the
[wj
touchpads
after
operating
the
trackball.
All
the
data
mentioned
above
are
display
ed
at
the
lower
part
of
the
screen.
The
EbL
ana/or
VRM
are
erased
from
tne
screen
by
pressing
the
[^1
and/or
touchpads
for
two
to
three
seconds.
holding
33

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