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Now is the time to turn on the unit and carry out the necesaary tuning and
presetting adjuatments.
INITIAL PROCEDURES
1
. Press tne
touchpad on the Display Unit, and the cx>ntroI panel will
light
up.
In
approximately
2
minutes
and
30
seconds,
the
raessage
"ST-BY" will appear at center of the screen.
While this warmup is in
ppooess,
pry
off the
VR
panel on the front
panel
of the
Display
Unit.
See Fig,l9.
This
will expose
the
potentiometers
for
post
installation
adjustments.
Push
in
the front panel TUNE control and
release it to
bring
it
out.
Set
the
control
to
12
o'clock.
the
GAIN
control at 2
o'clock, and the A/C SEA control at fully counterclockwise.
2. When the screen indieates "ST-BY" press the
@ touchpad,
The radar
will start transmitting
on
the 3-mile i-ange.
and you
Will
probaDly see a
number of targets around you,
even though the gain, tuning and other
adjustments have yet to be optimized.
3. Press the øJtl touchpad three times so that the radar is on the 24-mile
range.
Bring up the GAIN control until a small amount of noise appears
on the screen.
At this point, unless the tuning just happens to be at
the optimum point,
slowly adjust
the ooarse
"TUNE" control accessible
through
the
VR
panel,
watching
the
screen
for
radar
targets.
(See
Fig.l9.)
You must patiently adjust
this coarse-tuning control in very
small inerempnts,
allowing
the sweep
to go arourvd oomplctcly in order to
observe the effeet cf a single small change in ita setting. When you are
finished optimizing the coarse tuning control behind the VR panel, verify
that
the fine TUNE control on
the
front
panel
peaks
up
for
maximum
radar eohoes at 12 o'clock, or at least close to that point.
4. Adjust the GAIN control on the front panel, for a little background noise
showing on
the
screen,
and
then
hit the |~,Q touchpad aeveral times
to
bring you down
to
the
0.25-mile
range.
Without disturbing
the front
panel
GAIN
control,
adjust
the
A/C
SEA
control
until
nearby
radar
targets are clearly shown on the screen.
Too mueh A/C SEA action will
eliminate
small
targets,
and
too
little
A/C
SEA
action
will
cause
the
screen
to be
so full of targets and
noise that it is hard
to deterraine
wbich
target
is
wbich
as
compared
to
visual
sigh tings.
Note
that
adjusting
the
GAIN
and
A/C
SEA
oontrolo
in
this
manner
(GAIN
at
long
range,
A/C SEA at short range) will equalize the picture at all ranges,
and you will not have to jockey back and
forth
with the GAIN control
especially when you change range scales.
RELATIVE BEAHING ALIGNMENT
You have mounted the Scanner Unit facing straight ahead in the direction of
the bow.
Therefore,
a
small but conspieuous target dead
ahead
visually
shniild
appear on
the
hearting mark (Zero degree) .
In practice. you will probably observe some small error on the display for
most
installations
because
of
the
difficulty
in
achieving
accurate
initial
posiUoning of the Scanner Unit.
The following adjustment will compensate
for this error.
If you don't know how to do it well, it's best you leeve
this part to a competent service technician.
(Remeinber that the top radotne
fixing
bolts
remain
untightened.
They
ahould
now
be
sepured
if
the
following alignment is not necessary.)
16
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