Eagle Z-6100 User manual

LimoIN USA. 988-O1O624
EAGLE
Z-6100
INSTALLATION AND OPERATION MANUAL
EAGLE ELECTRONICS
P.O. BOX669, CATOOSA,ORLA.74015
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TABLEOFCONTENTS SURVEYING ALAKE
Introduction 2
Installation 2 Themostsuccessful
anglersonany lake orreservoirarethosewho
PowerConnections 3 fish itdayafter dayand
yearafteryearuntilthey learnthehotspotsthat
Noise 4 producefish consistently.Theydiscoverthrough experiencewhere,and
KeyboardBasics ..'Li; 5 atwhatdepth, theycanexpect
tofindthekindoffish theywantatany
Operation 7 season.And theyrealizethat theseproductiveareaschangethroughout
On 7 the
yeardepending
onwater level,
temperature,food,and otherfactors.
Off WiththeaidoftheZ-6100,
anyone caneliminate
guesswork
and
Auto concentrateontheareaswherefish are likelytobe—evenifits thefirst
Sensitivity 8 timeonthelake!
AutomaticSensitivity Advanced 10
ChartSpeed 10 Themost efficent
way tobecomeaquaintedwith abodyofwateristo
Range 11 survey
itwith yourZ-6100. Startoutwitha
mapofthelake,ifpossible,
LowerLimit 11 andindicatethe
promisingspotsin relationtolandmarksonshore.
Zoom 12
Auto Range
withZoom BottomTrack 13 As yougoaboutyoursurvey, your Z-6100willtellyou the
depthand
Zone Alarm 14 kindofbottom. Itwill alsorevealsuspended
fish.
Multiplesignalsonthe
Di ital 15 dial usuallyindicateagood school offishandit'sworth ittostopand
LIght 16 fish forthem.You may
not
getanyfurther.
Transducers
and ConeAngles 16 Keep
afew marker
buoysin the boat,readytotoss overboard.When
Signal Interpretation 17 theZ-6100 indicatesaschool offish,throw abuoyout.The
string
will
FishSignals 18 unwinduntilthe sinkerhitsbottom.
Then,
becauseofthemarker's
flat
SurfaceClutter 20 shape, itwon'tunwind
any
further.
Withtheschool thus marked,youcan
WaterTemperature and Thermoclines 20 make
yourturnandcomebacktofish in exactlytherightspotThis is
Surveying
aLake 22 essentialwhen
you'refarfrom shore ona
biglake.Unless youmarkthe
BaitFish 22 school offishwhen you'reover it, youmaynotbeabletofinditagain.
BAIT FISH
Theimportance ofbait
fish tosuccessful
fishingcan'tbeover-
emphasized.Theyarethe principlefoodofallgamefish in mostwaters.
Baitfish aretheplanktonfeeding forage
fish,suchasminnowsand
shad.Baitfish canalsobethe
youngofgame
fish, suchascrappies,
bluegill,
and bass.
Most baitfish areconcentratedwithinfivefeetofthesurfacewhere
sunlightpromotes
thegrowth ofthe
planktononwhich theyfeed.One
methodof
fishingistousetheZ-6100tofindthebaitfishfirst.Aschool
ofbaitfish will look likea"cloud"onthe
1-6100's display.
Usually,game
fish will benearby,
oftendirectly beneaththeschool ofbait
fish.
1 22
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Mostfish dontspawnunlessthe
water
temperature
iswithin rather
narrowlimits. Tofindthedifferent
temperatures,
asurfacetemperature
meter,
suchasthe EDT-20isavaluableaidtoyour
boatThisunit
provides
anextremelyquickresponsetoidentifying
thedesired surface
waterspawningtemperatures
forvariousspecies.
Troutcan'tsurvivein
streams that
get
toowarm;bassandotherfish eventually
dieout
when
stockedin lakesthatremaintoocold during the summer. While somefish
haveawider
temperature
tolerancethan others,
each hasacertain
range withinwhichittriestostay.Schooling fish suspended
overdeep
waterlie atthelevel thatprovidesthistemperature
in which,weassume,
theyarethemostcomfortable.
Thetemperature
of
water in thelake isseldomconstantfrom
top
to
bottom. Layers ofdifferent
temperaturesform, andthe
junctionofa
warm
and cool layerofwaterisoalleda
thermoclirie.The
depthandthickness
ofthethermoclinecanvary with the
seasonortimeofday.Indeeplakes
theremaybetwo ormore atdifferentdepths.
Thermoclinesare important
tofishermen because
theyareareaswhere fish areactive.Many times
baitfish wilFbeabovethe
thermoclinewhilelargergamefish will
suspend
in orjust belowit.
TheZ-6100candetectthis invisiblelayer in the
water,butthe
sensitivity
willprobably havetobeturned uptoseeit
INTRODUCTION
WhentheZ-6100
LiquidCrystalGraph (LCG)isturned on, itwill
automatically
findand displaythe bottomsignaland othertargets.
As the
depthofthe bottom
changes,
theZ-@100willautomaticallychange the
rangeand sensitivity
toalwayskeeptheboffom
signalonthedisplay.
If
desired,
theonly
keythat needstobetouched istheON key.Howeve
the
automaticmodecanbedisabledwhichallowstheZ-6100tobe
manuallyadjusted.
TheZ-6100isnitrogen filled and sealedfor completewaterproof
protection.
Theliquidcrystaldisplayand keyboardare lacklighted
for
easyuseatnight,plus
it'scoveredbyafull one yearwarranty
which
includesallpartsand laborforoneyear
fromthedate ofpurchase.
Toget
startedwith yourZ-610p,
firstread the installationsection.This
iswhere itallbegins, and improper installationcancause problems
downtheroad.After
you've readthese instructionsand installedyour
Z-6100,
readtherestofthismanualin detail.Themoreyouknowwhen
youget
tothe water,themoreyour
Z-6100will doforyou.
I
WSTALLATION
Mounting
The
Z-6100 can beinstalledin any
convenientlocation,providedthere
isclearancewhentiltedforthebestviewingangle.Holes in thebracket
baseallowwoedscreworthrough boltmounting.
Thebracket canbe
aftachedtoaluminum
panels
withsheetmetalsdrews.However, we
suggestplacingapieceofplywood onthebackofthinfiberglasspanels
tosecurethemounting
hardware.Make certain thereisenough room
behindtheunittoattachthepowerand
transducer cables.
A1½" holeinthebaseofthegimbalbracketallowsthepowerand
transducercablestoberouted straightdown
throughthemounting
surface.
Thesmallest
hole that willpassthe
transducer connector
throughis3%"Thiswillallow thetransducerconnector and cabletobe
passedupthroughtheholeand gimbalbracket then thepowercable
wirecanbepushedDOWN
through the bracketand dash.Afterthe
cableshave beenrouted, theholemaybefilled with silicone
rubber
adhesive(RTV), orthebracketcanbeoffsetsothatthe
majorityofthe
holeiscovered.
21 2
I'll" AUTO.
III ..
ILl
TI-IERMOCLINE
Simulated
Pictures
Figure17 U.S
HO
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3 20
SURFACE CLUTTER
Themarkings atthe
topofthescreenrepresent
thesurfaceofthe
water.
Theycanextendmanyfeetbelowthesurfacewhichcan interfere
with fish signalsorother
targets.
Thesemarkings arecalled"surface
clutter and arecausedbyalgae,plankton,
baitfish,andairbubbles
created
byboatwakesorwaveaction.
Thesemarksarenormaland canbeseenatanytime during the year.
Power Connections
TheZ-6100operates
froma12voltbatterysystem. Thepowercable
can beattachedtoanaccessoryorpower buss, but ifyouhave
problemswithelectricalinterfemnce(randomdotsor linesthatshow
wheneverthe
boatsengineoranaccessory ison), thenattachthecable
directly
tothe
battery.
Thepower cablehastwo wires,red isthe
positiveleadand black is
negativeorground.
Anin-linefuseholder containing
a3amp fuse is
suppliedwiththeZ-6100.Thisattachestotheredwire onthe
power
cablewith the
crimpconnector.Theotherend ofthefuseholder
attaches tothe
batteryoraccessorybuss,If
thecable isnot
longenough,
spliceordinary#18
gaUge
wireonto itBecertainthatthe fuseholder is
asclosetothe powersource(battery
oraccessorybuss)
as
possible.
Thisprotectsthepowercable andyour
Z-6100in the
eventofashort.
TheZ-6100 isprotectedfromaccidentalpolarityreversalsandwillnotbe
harmedifthewiresare reversed. (However, the unitwillnot
workuntilthe
correct
polarityisapplied.)
EL
-srns,r,VTv
POWER C6tE
tizu SPLi.L
OLOER
AT1ER
SURFACE
CLU1TER
fl. -
.4 .e.
'4-
Figure
16
WATERTEMPERATUREANbTHERMOCUNES
Water
temperature
hasan important—if
not
controlling—influence
uponthe activitiesofallfish. Fishare coldblooded andtheirbodiesare
always
the
temperature
ofthesurrounding
water. During
the
winter,
colderwater slowsdowntheirmetabolism sothat
they
needabouta
fourthasmuchfood as
theyconsumein thesummer,
40
OR
S/mu/aled
Pklure
— SIDE
OF 3A1TER
Figure1
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Remember,there mustbesomemovementbetweenthe boatandthe
fish todevelop
thearch.Usually
this meanstrollingatveryslowspeeds
with themainengine
in gearataminimumthrottlesefting.
Thedepthofthewaterwill alfectthe size andshapeofthe fish arch
due tothe coneanglediameter. For
example,
iftheconepasspsovera
fish in shallowwater, thesignaldisplayedonthe
Z-6100 may not
arch at
all, duetothe narrowconediameterandtheresolution imitationsofthe
display.
Even the20degreetransducerhasonlya3foot
diameteratthis
depth.
Compared
toapaper
graph,
a
Z-6100 cannotshow asfineofdetail
becausethepixels
(dotsonthescreen)are much argerthanapaper
graph'smarkings.
Therefore,
theZ-6100 cannotshowfish archesaswell
asagraph,
anditrequires abitmoreworkinitially toreadand interpret
thescreenthana
peper
graph.
Verysmallfish probably will not
arch atall, while
mediumsizedfish will
show
apartial.arch,
ora
shapesimilartoan arch ifthey're in deep.water,
Large
fishwillarch,butthesensitivity
needstobeturnedup in deeper
watertoseethearch.Becauseofwater conditions,suchasheavy
surfaceclutter, thermoclines,etc., the
sensitivity
sometimes
cannotbe
turnedhighenough
toget
fisharches.
Oneofthebestwaystoget
fisharches istoexpandor"zoom" a
segment
ofthewater,for example
30to60feetThesmallerthe segment,
thebetterthe
screenresolutionwillbe. Then,turnupthesensitivity
as
highas possiblewithout
gettingtoomuch noiseonthe screen.In
mediumtodeepwater,thismethodshould worktodisplayfish arches.
fl;iiiii;uii
ilOPib
Simulated
Pictures
Figure15
19
'FRANSDUCER
Installationinstructionsfor
thepermanent mount
transducerare
suppliedwith the transducerin aseparate
package.
Pleasereadthe
instructions
carefullybefore youstartinstallingthetransducer.
NOISE
Electricalnoisepicked upby
the
power
cablecan beminimizedby
routingitaway
fromotherpossiblesources ofelectrical interference.One
ofthelargestnoisegenerators
istheengine'swiringharnessthatruns
fromtheengine
tothe
instrument
panel.Thisharness
usuallycontainsa
wireforthe
tachometer
whichradiatesRF(radiofrequency)energy.
For
best
results,
keepthe powerand transducercablesawayfromtheengine
wiring.Also,bilgepump wiringcan sometimesradiatenoise so
tryto
keeptheZ-6100'scablesawayfrom thosewires.
VHFradioantennacablesradiateRFehergyathigher
power levels
than eventheengine'swiring harness, Itisveryimportant
tokeepthe
Z-6100's powerandtransducercables asfaraway aspossible
froma
VHFradioantennacable.
Ifthereisnonoise—interference—ontheunitwhentheboatis
sifting
still with the
enginerunningin neutral, butinterference
beginsatslow
boatspeeds,worsening
astheboatspeed increases,
thenaprobable
caUse
isacousticnoise, orcavitation.Thisnoiseisnot
electrical,but
rathermechanicallyinducednoisefromthe transducer.
Usually, acoustic
noiseiscreated
byairbubblespassing
over thefaceofthetransducer.
Thefasteraboattravels, themore airbubblesincreaseand generate
noiseonthe
display.
Toeliminate
thisproblem,readthetransducer
owner'smanualforpropermountingtechniques.
4
Imumamam
dO
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KEYBOARDBASICS
SENSITIVITY These keys
control thegraph'ssensitivi'.
(ThedIgital'sSnsltivity
is
automatically
adjusted.)
The
receiversensitivity has 32
speeds
whichallows
adjusr,ent
overawide rangeot
conditions.Theleftarrow
key
decreaseslhe
sensitivity,
the
rightarrow
keyincreasesii
ALARM KEYS This groupor—i
keys control theZ-6100szone
alarm.Itcan beusedasa"fish
alarm'withupperandlower
limitssetsothat atarget(such
asafishor
school offish)will
set off
thealarm tithetarget
entersthealarmzone.
ZOOM The
rangcthnbe
expanded
or'zoomed" onthe
displaybyusing
thiskey.
ON OFF These
keysturn
theZM100onand off.Toturn
it
on,simplypressthe ONkey. To
turnitoil,press andHOLDthe
OFF
key.
You musthold the
OFF
key
downforaFew
secondsinorderfor
theZ.6100
toturnoff.
You'll nofioeabeepevery
timeakeyispressed.
Thisis
theZ61OOs way oftellingyou
thatIthasaccepted a
command.
FISHSIGNALS
The
signalsdisplayedontheZ-6100by
fish canbeidentified
by
Various
shapedmarkings
in certainpatterns, asopposed
torandom
markscreatedbynoise, orthesolid,
continUous markings madeby
the
bottom.
Individualfish can,attimes,
bedistinguished
by
acharacteristicarch
thatseparates themfromtheir stationarysurroundings.
The'
reaé'onfor
this isshown below.Thedistancetoafish whenitmoves
intothesonar's
cone ofsoundisshownas"A" Figure 14.Whenthefish hasmoved into
thecenterofthecone, thedistancetoitwill beshorter,
"B'and asit
movesout ofthecone, thedistancewill increase
again
asshown in "C".
Ifa
partialarch occursmost ofthe timeonyourunit
(themarkcurves
up,but not back down, orvice-versa)
itcouldbethetransducerisnot
pointedstraightdown. Ifthetransducerismountedonthetransom,
adjustituntilthefish showthedistinctivearch.Thismay takesometrial
and erroruntilthecorrect mountingisachieved.
HIll"
Figure2
Figure14
B
A,r :c
111
Sn
5
5Th701a
ted
Picture
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Eagle
offersachoice oftransducerswitheitheran8or 20degree
cone anglethatwill Interchange
with anyofthe 192kHzsonarproducth.
Inother
words,
anyEagle sonar instrument canbeusedwith anyEagle
transducerofthesame
frequency
withnoloss ofperformance.
Howevet
theuseofany olhermanufacturers'
transducerwill resultin alossof
performance.
Generally,
wide coneangle
transducers(20degrees) areideaflysuited
foroperatingin shallow
tomedium
water depths. The20degreecone __________ __________
angleallowsyoutoseemoreofthe underwaterworld. In 15 feetofwater
the20degreeconecovers
anareaabout sixfeet across.The8degree
transducercoversonly aboutatwo foot
circle.
The20degreetransducerisalmostalwaysthebest
touse in fresh
watewhilethe8degree transducerisusedmostlyin
saltwater.In a
deepwater
environment, (300feet—freshwater,100feet—saltwater)
the
narrow cone angieismoredesireablebecause itcanpenetrate
tomuch
deeperdepthssincethesound energy
isconcentrated in asmallerarea. ________
Both8degreeand20degreetransducersgiveaccurate
bottom
readings,
eventhough
the
bottomsignalismuch wideronthe20degree
modelbecause
youareseeing
more ofthe
bottom.Remembet
the
shallow edgeofthesignalshowayou
thetruedepth.Therestofthe
signaltellsyou whether
you areover rocks,mud,etc.
Transducersonsaltwaterboatsneedtobepainted with a
thin coat of
anti-foulantpaint
toprevent
organisms
fromgrowing. Ifunchecked,
barnaclesand other
marine
growthwill causeadecrease inthe
transducer'ssensitivity. Donotuseametalbasedantifoulant
paintasit
willdecreasethetransducer's
senstivity. Thereare specialanti-foulant
paints
specificallydesigned
fortransducers.
They're readilyavailableat
mostmarinedealers.
SIGNAL INTERPRETATION
BecauseyourZ-6100
isbothextremely
sensitiveand powerful,itcan
giveyouanaccuratepictureofthekindofbottom overwhich your boat
ispassing. Abottomoffirm sand,
gravel,shell,orhard clay returnsa
fairlywide signal. Ifthe automatic
sensitivity
isturnedoff, andthe
signal
narrowsdown,thenitmeansthatyou havemoved overamudbottom
becausemudabsorbsthe soundwaveandreturnsaweak signal.
Turn
upthe sensitivity. If
youhavethe automatic
senstivityturned on,watch the
sensitivity
bar.As the boat
passesoverthemudbottom, theZ-6100
will
automatically
increase
the
sensitivity
tomaintainagood bottom
signal.
Thesensitivity
barwill helpyouin determiningifthebottomissoftor
hard.Ifitincreases
while inthesamedepthofwat&, then theboathas
movedoverasoftbottom, ifitdecreases,
then itisoverahardbottom. Of
course,
asthe waterdepthincreasesor decreases,
thesensitivity
will
also change.
17 6
SENSITIVITy
LIGHT
=*-
______V
+ +
SHALLOW SET DEEP SET
.
+ ..'. +
CHART Thechart
speedis
,v controlledby
theCHART
group
ofkeys. TheZ-6100 has32
chart
speeds, rangingfrom Very
slowto
FAST.
Pressingthe
FAST
keyspeeds upthechart
speed.
Theslow
keyreducesit.
Thechart displaycan be
stoppedandstarted again by
pressingbotharrow keys atthe
samelime.
,__._—RANGE The
rengbkeysallow
you toselect different depth
rangesbypressing theup or
downarrow.Theavailable
rangesere: 10,20,40,60,103,
200.
400,and600.
AUTO TheAUTOkey
switchestheZ-6100 inorout
of
theautomaticmode, whenthe
Z-6100isfirstturned on,it
automaticallyadjuststhe
sensitivity
andrangeselection,
andtheword "AUTO" willbe
displayednearthelop ofthe
screen, Bypressingthe
AUTO
key,you can take control ofthe
Z-6100,makingmanuel
adjuslmenlsasdesired,When
theZ-B100isIntheautomatic
mode, theword "AUTO"willbe
displayed
near the
lopofthe
disploy.
LOOM JRJ
[OFF if ON.1
MADE IN U.S.A.
Figure3
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OPERATION LIGHT
Whenthe Z-6100is firstturned on, itautomatically
findsand displays
thebottom
depth,setsthe sensitivitylevel, and much more. Ifdesired,
the
Z-6100canbeleft
in thisautomatic modeandUsed
forfindingfish and
the
waterand bottomconditionsthey prefer. However,
virtuallyevery
functionoftheZ-6100can bemanualliàdjiijted
sothat
"fine.tuhiñi"
of
the
unittothe
surroundingconditionscanbemade.
ON LONI
TheON key islocatedin thelower
right
cornerof.thekeyboard.Itis
placed in this locationsothat itcanbeeasilyfound—evenatnightTo
turnthe
Z-6100 on, presstheONkey.Anaudiblebepwill beheard
signifjing theZ-6100knowsthatakeyhasbeenpressed;
Thechart
lightswillbeginflashing,
thenstop afterskseconds.Thechartwillbegin
scrolling acrossthe
display
andthe number"0" willflash.
Thisnumberis
thedigitalbottomdepthdisplay.
Aftertheunithasfoundthe
bottom,
the
depthwillbedisplayed.
OFF [oFF]
ToturntheZ-6100
off,press
and HOLD theOFFkeyuntilthedisplayis
erased.
[AUTOH
AUTO
WhentheZ-6100isfirst
turnedon,theautomaticmode ison.To
switch itintothemanualmode, presstheAUTOkeywhichislocated
abovetheONkey. Theword AUTO atthe
topofthedisplaywillbe
erased,
auto sensitivity
andauto ranging will bothbecancelled,plusthe
digitaldisplaywillbeturnedoffand youwill havecomplete manual
control ofthe
Z-6100.TheZ-6100canbereturnedtothe
automaticmode
atanytime
bysimplypressing
theAUTO keyagain.
7
Alight isprovided foroperationoftheZ-6100atnight.
Whentheunitis
firstturned on,thelightswill flash for6seconds.Thesensitivitykeysare
usedtoturnthelightsQifand on. Toturnthe
lightson, simplypress
both
theleft
and right arrowkeysatthesametime
andthelights willstayon.
Toturnthelightsoff
pressboth arrow keys atthesametimeagaih. The
lightswill alsogooutwhen theZ-6100isturnedoff.
TRANSDUCERS
AND CONEANGLES
Thesoundwavesfromthetransducerspreadoutintothewaterin a
cone shapedbeam,
much likethebeam
fromaflashlight The
angle
betweentheoutsideedgesof
thecone iscalledtheconeangle.
Depth coneAngle I
Diameter
gpI
I
50 71¾. lOft.
100 14 35
I
150 21 3
Figure13
SO'
100'
150'
200'
8°at3db
16
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As longasthe "ZONEALARM"signalisdisplayed,
thealarmis
engaged.
If
youwishtoviewthezone alarmbar, simplypress eitherthe
SHALLOWSETor DEEPSET keys and the barwillbedisplayedforsix
seconds.
Ifthe zonealarm issetoffby
afish orthe
bottom,
thealarmwill sound
andtheword"ALARM"willbeseen atthe bottomofthedisplay.
Ifthe rangeischanged,
thezone alarmmayneedtobechangedsince
itdoes nottrackrange settings. Thus,its usewith the
automaticmodeis
possiblebutnot recommended.
NOTE:Ifthedigitalison, the chartbarmayinterferewith thedigital
displaywhile the shallowordeepalarmsare beingadjusted.
Thedigital
displaywill returntonormalafterthezonealarm bardisappearsandthe
bottomsignalchangesdepth.
CLEARINGTHEZONE
ALARM
ToturntheZoneAlarmoff, pressboth theSHALLOW
SETand the
DEEPSETkeys
atthesametime.
TheZoneAlarmsettings
will remainin
memoryuntilthe Z-6100isturned off. Pressingeithershallowordeepset
keyswillturntheZoneAlarmbackonwith theprevioussettings.
DIG
ITAL
Acompletedigitalsonarisbuilt insidetheZ-6100.Itautomatically
discriminates
betweenthevalid bottomechoesandfalseechoesfrom
fish,
thermoclines,
orothersignals.
Thedigitaldisplaywillshow only
the
bottomdepth.
WhentheZ-6100isfirstturnedon,thedigitalwillflash
"0"until ithas"lockedon" tothebottomsignal.
Onceithasacquiredthe
bottom
depth, itwill display
thedepthin the lowerleftofthedisplay.
Although itisnotnecessary in normaluse,toget
the
maximum
performanceout of
yourdigitalsonar, stop thechart
bypressingboth
arrowkeysin the
chartsectionofthekeyboard. This turnsthe
Z-6100
intoadigitalsonaronly
and allows it tobettertrackthebottomsignal.
Onereasontousethe
digitalin this manner would beifyouaregoingto
travelathigh speedfromonepartofalake
toanoherandyoujustwant
toknowthem bottom
depth.
The
digitalisturnedoffwhenever theZ-6100 istaken outofthe
automaticmode.
SENSITIVITY k==1
Whenfirst
turned on, theZ-6100 isin theAUTOSEARCH mode.This
meansthesensitivity
and rangeareautomaticallyadjustedby
themicro-
computertofind and lock ontothebottom.Thesensitivity
canbeleftin
theautomaticmodeoritcan bemanuallyadjustedtosuitconditions.
Thesensitivity
level isdisplayedby
a
horizontalbar atthe
topofthe
display.Whenthesensitivity
isatminimum,
thebarisvery short.As
sensitivity
isincreased,
the bar will traveltotheright,increasingin length
correspondingly.
Whenthe sensitivity
issettomaximum,
thebarwill
extendacrossthe
top
ofthedisplay.
sENsITIVITY
BAR
To manuallyadjustthesensitivity, press
theAUTOkey once,and auto
sensitivity
willbeturnedoff.Theword
AUTOatthetopofthe
displaywill
disappear,
signifying
thattheZ-6100 isin themanualmode.Toincrease
thesensitivity, pressand holdthe right arrow keyuntilthesensitivity
isat
thedesired level.Theleftarrowdecreasessensitivity
inthesame
mannerNotice howthe
sensitivity
barmovesasyou changesettings.
Whenyou press therightarrowkey,thebarmovestotheright,indicating
anincrease in sensitivity. Pressing
theleft
arrow keymovesthebartothe
left, indicatingthe
sensitivity
hasdecreasedaccordingly.
You'llalsosee
thechange onthedisplay.
Simulated
Plclure
Figure4
15 8
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Figure5demonstratesagraphwithtoolittlesensitivity, whileonthe I
right,thesensitivity
isadjustedproperly; fisharevisible, the
surface
clutterismorepronounced, and the bottom
signalhaswidened. —4 4,
- SHALLOWSET DEEPSET
ZONE ALARM
TheZoneAlarmcanalso bethought ofasafish alarm.Itwillsound
TOOLIULE whenan echo isdetectedinsideitswindow.
SENSITLVITY PROPERLY TosettheZoneAlarm presstheSHALLOWSET
key in the ZONE
ALARMsection ofthekeyboard. ThewordsZONEALARMwill be
displayedin thelower leftcornerofthescreen.Avertical barwillbe
displayedonthe leftside ofthescreen.This istheZoneAlarm's
"window".Any echothat appearsbetweenthetop and bottomofthisbar
will sound thealarm.Boththeshallowanddeependsofthis barcanbe
adjustedtomakeasmalleror largeralarm"window".
Toadjusttheshallow(top) alarm, press theSHALLOWSETkey, then
presstheuparrow keytomove
the
topofthealarmwindow up, orthe
downarrow key tomovethe topofthezonedeeper. Thebottomofthe
zone canbesetinthesamemanner
usingtheDEEP SET key. Waitfor
thezone
alarmbartodisappear,press
theDEEP SET key,the zone alarm
barwillreappear, thenpress eitherthe uparrowkeytomakethebottom
partofthewindow moveshallower,
orpressthe down arrowkeytomove
thebottomofthe
windowdeeper. Afterthekeys are released, thebarwill
remainonthescreenforsixseconds, and thendisappear.
Figure5 Figure6
ZONE
ALARM S¼iulated
SAR P!CiUIE
Whenthehorizontalbar reachesthefarrighthand sideofthe
screen,
thesensitivity levelisatmsximum Ifhighsensitivity
settingsareused a
secondbottom echomayappear. This isnormal and iscausedby the
returningsignalreflecting
offthesurfaceofthe
water,makingasecond
trip
tothebottom andbackagain. Thisiscalled "second echo".
Toturn
AutQ Sensitivity
backon, press theAUTOkey. Remember, both Figure12
automatic
sensitivity
controland autoranging functionsareturnedoff
and on atany timebypressing theAUTOkey.The
two controlscannot
beturned offoronseparatelybypressing theAUTOkey.
9 . 14
sNsTVITYL
—
Sfmu/aiedPciutes
- -SENSITIVITY
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