used to outline the bottom contour
which
might
otherwise be hidden
beneath trees and brush; it can
also give clues to the composition
of the bottom. A hard bottom
returns a very strong signal caus-
ing a wide gray line. A soft, muddy
or weedy bottom returns a weaker
signal which is emphasized
with a
narrow gray line. Do not advance
the control too far or it will gray
line on the target completely,
showing no black, which makes
the target
difficult to see.
RANGE
The range
function utilizes the
keyboard to select any range
between 0 and 8000' in 1 foot
increments. Please read this sec-
tion carefully
to get the most out of
the X-16's range capabilities.
LOWER LIMIT
When you first turn on the X-1
6,
the range will be 0-60 feet.
To change to a deeper range,
simply press the desired depth on
the keyboard, and then press the
LOWER LIMIT
key.
NOTE: Remember, any depth may
be used as a lower limit displayed
at the bottom of the chart paper.
Example: Change range to 0-256
Press: 2-5 -6- LOWER LIMIT
Note that the paper speed
slows
automatically at this range setting.
down to a minimum when looking
for fish.
However,
it is helpful sometimes
to have longer pulse
width when
resolution is not a concern. When
using a sonar in deeper
water, it is
easier for the unit to detect a
longer pulse coming back from the
bottom or from fish. This is called
"Probability of Echo Detection".
The probability of the unit being
able to detect an echo returning
from
deep water is diminished
because the further the sound
pulse has to travel, the weaker it
becomes. By broadening the pulse
length, in essence, a larger signal
is transmitted and it is easier for
the receiver to detect it.
For this reason, the micro-com-
puter
in the X-1 6 automatically
increases the initial pulse length of
the unit as deeper
lower limits are
set by the operator. (Note: Initial
pulse length is the pulse length of
the unit when the Suppressor
control is set to minimum.)
From 200 feet to 599 feet, the
initial pulse length increases at the
same rate as the depth. For
example, with the LOWER LIMIT
set to 260 feet, the initial transmit
pulse length would be 260 p5. If
the LOWER LIMIT is set to 390
feet, the initial transmit
pulse
would be 390 ps. The
pulse
length from 600 - 879 feet is the
depth plus 4 micro-seconds Qis)
per foot OVER 600 feet. In other
words, with a lower limit of 700
feet, the initial transmit
pulse
length would be 1100 micro-
seconds.
The transmit
pulse length can
be increased from the initial point
at any time
by using the
Suppressor control. The maximum
amount of pulse length added to
the initial transmitter pulse length
is approximately 800 micro-
seconds. In other
words, if the
LOWER LIMIT is set to 420 feet,
and the Suppressor control is
increased to the maximum, (press
7 - 2nd - 9) the transmitter pulse
length would be 1220 micro-
seconds. (420 initial + 800 =
1220.)
The amount that the initial
transmit
pulse length is increased
with suppression is listed in the
following chart. Remember, the
number in the right hand column
is the amount added to the initial
transmit pulse length.
When Suppressor level 0" is
chosen, the suppressor level is
automatic. This ties in with the
Discrimination feature. As different
levels of Discrimination are
selected, and the
Suppressor level
is set to 0", the suppression level
12.0— 120—
—240 -
—240-—-
—360—--———- 260—
—400--—— ——480—
feet.
60.OFT—— 3=1—-—— LOIJRAMCE - - - 60.OFT
FIGURE 11
Example: Change range to 0-75
Press: 7 - 5 - LOWER LIMIT
FIGURE 9 —15.0—--— _——-— 15.0—
30.0 - ________—---— 30.0——
45.0 - ——-—450
600——-— ——--—-— —600
—75 OFT
111
—— LD4RFMCE——-— 75 OFT
FIGURE 12
FIGURE 10 GRAYLINE "ON"
INITIAL
LOWER TRANSMIT
LIMIT PULSE WIDTH
(feet) (micro-seconds)
1-19 110
20-29 130
30-199 160
200
- 599 Same as LOWER LIMIT
600
- 879 Same as LOWER LIMIT + 4ps/ft
over 600'
880
-
maximum 1700
j.s
feet.
8 21
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