Operator Switches And Controls - JW Fishers SSS-100K PC Operation And Maintenance Manual

OPERATOR SWITCHES AND CONTROLS

THE HARDWARE
Sonar Processor Box - There are two sets of GAIN controls on the Sonar Processor box. One
set is for the right channel (right side transducers on the side scan fish) and the other set for the left
channel (the left side transducer on the side scan fish). The Near Gain, Far Gain, and Overall Gain
controls are adjustments for the Time Variable Gain (TVG) amplifier. The function of these controls
is to adjust the amplifiers to compensate for signal losses that occur when the signal travels through
the water. When they are adjusted properly, a reasonably even color will represent the ocean floor
from the center of the screen to the outer edge of the scanned area.
The Sonar Processor amplifies and conditions the signal from the fish. The amplifier in the Sonar
Processor is called a Time Variable Gain (TVG) amplifier. The gain of the amplifier increases over
time for each returning signal. The operator has very precise control of the TVG amplifier using the
three gain controls.
Left Channel
TVG Gain
Controls
(Near, Far, and
Overall Gain)
The control panel of the Sonar Processor Box contains:
• Power On Switch - When switched to the ON position power is applied to the processor's
electronics and the green LED is illuminated. If the cable to the towfish is connected
(it should be before power is turned on) then power is also sent to the "downstairs"
electronics in the fish.
• Near Gain Control - Adjusts the gain for objects close to the fish.
• Far Gain Control - Adjusts the gain of TVG amplifier so that the reflected signal from objects
farthest from the Head can be amplified sufficiently to produce an image on the moni-
tor.
• Overall Gain Control - Adjusts the darkness of the overall sonar image in the selected color.
Power On
Switch and
LED
SONAR PROCESSOR BOX
25
Right Channel
TVG Gain
Controls
(Near, Far, and
Overall Gain)