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INTERFERENCE SOURCES or BAD RECEPTION
Se 1 ect
Funct ion
Land Sources:
1.
Military
installations.
(High power
transmitters
in
the
loran
band.)
2.
Hydro-electric plants. (Dams)
3.
High voltage power
lines. These radiate noise at
high
levels.
4. Storms. A storm between
you
and the loran station
can interfere with
the
signals,
even if it's
many
miles
away.
5.
Mountains, trees, buildings.
These
reflect the
signals. Try
to
stay
in
an
open
area.
Boat Sources:
1. Boat
engine.
Resistor
spark plugs help,
alternator noise filter
may
also be
required.
2. Power cable routed to fuse
panel
instead of
directly
to
battery.
Route
the
power
cable
directly
to the
battery.
3. Bad antenna
placement.
The antenna should be
placed
in an
open
area on the
boat,
away
from other antennas or structure.
4. Fluorescent
lights.
Symptoms
of noise or interference
problems:
turned off.
1. Loran won't lock on to stations
2.
Accuracy
is not
repeatable
or erratic
a.
Try using
the manual mode
3.
XTE,
Bearing, Heading,
SOG,
or TEG erratic or
inaccurate
4. Cross Track arrows move too much
a.
Waypoint
must be recalled to use cross track error
feature.
5. Loses lock while boat is
moving:
a.
Try
resistor
spark plugs
Dst
Log
in ml
'fl .4. T
•
1.
og
in
.m
Dst
Log
in NFl
I
I
I
I
'I
Now
press
the
key adjacent
to the desired
label. The Z-9500 will return
to the sonar screen.
The distance
log displays
the distance
travelled from the time it was
first turned on. To reset the distance
log
to zero,
press
the MENU
key.
Next,
press
the
key adjacent
to
the "More" label. This
brings up
the
second menu
page.
Now
press
the
key adjacent
to the
"Digital
Dis-
play'
label.
Next,
press
the
key adjacent
to the MORE label
again.
Finally, press
the
key
next to the Distance
Log
label. Press the
key
adjacent
to the "Reset Dst.
Log"
label to reset the distance
log display
to zero.
To turn the distance
log off, go
to the distance
log
menu,
then
press
the
key adjacent
to the "Dst
Log Disp
Off" menu.
NOTE: The distance
log
is retained in
memory
when the Z-9500
is
LORAN DISPLAY
Position information can be
displayed
on
the Z-9500's sonar screen.
Latitude/longitude,
or distance and
bearing
to a
waypoint
are
placed
on
the left side of the sonar screen.
To
display position
information on
the sonar
screen,
press
the MENU
key.
Next,
press
the
key adjacent
to the "More" label. Now
press
the
key
next to the
"Digital Display"
label.
Press the
key
next to the "More"
label until the screen shown at the
top
of the
next
page appears.
Now
press
the
key adjacent
to the "Loran
Position" label. The screen at the
top
of the next
page appears.
Press the
key adjacent
to the desired
function. For
example, pressing
the
key
next to the "Show
Lat./Long."
102
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