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water depth again exceeds the level entered for the 2ANGESTART.
If you are not about to return to deeper water, we suggest that you discon-
nect the transducer cable, and thus gain access to adjust the2ANGESTART,
either to zero or to a more appropriate water depth.
3CROLLSPEED - is the rate of movement of the targets on the display
screen, moving from right to left. It is adjustable, to allow the user to
show a longer "history" on the display screen, if desired.
3CROLLSYNCHRONIZATION - the screen can be updated on the basis of time
or distance (when data from last ping appears on the display).
3IGNALTHRESHOLD- can be set to ON to eliminate the appearance of un-
wanted noise.The threshold level is automatic and the feature should be
used with caution, as it may eliminate small fish and small unidentified
objects on the screen.
4RANSDUCER - the transducer serves as the acoustic "loudspeaker" and
"microphone" to send and receive the signals through the water.
Transducers are most often made from ceramic elements carefully built
into a robust housing. The ceramic elements change shape when a volt-
age is placed across them (when the EQ32 MKII transmits a signal), and
they also generate a voltage when they encounter sound waves (as when
the EQ32 MKII is receiving an echo).
46' Time Varying Gain - is a control that allows the EQ32 MKII to
make corrections for most of the losses and absorption that occurs as
sound energy passes through sea water. Adjust TVG in Presentation
setup. There are two settings to choose from, Normal and Special.
The setting Normal (20 log R) is for general fish finding at depths
down to 50m (150) and it will also give a uniform bottom echo presenta-
tion at shallow, mid and deep water.
The setting Special (40 log R) will adjust the TVG to show the same
echo strength for a given size fish at varying depths.
7HITELINE- is a control which places a white/black line at the displayed
sea floor and blanks out 4 pixels just below the line. The purpose of this
!PPENDIX! %1-+))'LOSSARYOFTERMS
52
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