Lowrance X-20A User manual

X-20A
INSTALLATION AND OPERATION
INSTRUCTIONS
LITHOINU.S.A. 988-0105-36 •LOWRANCE ELECTRONICS,INC. 12000E.SKELLYDR., TULSA,OK 74128
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26
TABLEOFCONTENTS
INTRODUCTION 1
INSTALLATION 1
POWER CONNECTIONS 2
KEYBOARD BASICS 3
OPERATION 5
SENSITIVITY 5
CHART
SPEED 7
RANGE 8
ZOOM 8
DIGITAL 9
FISH I.D. FEATURE 10
AUTO 11
ALARMS 11
CHARTALARM 12
FISH ALARM 13
SPEAKER 13
LIGHT 13
MODE 14
SIMULATOR 16
TRANSDUCERS ANDCONE ANGLES 17
SIGNAL INTERPRETATION 18
FISHARCHES 18
WATER TEMPERATURE ANDTHERMOCLINES 20
SURVEYING ALAKE 21
BAITFISH 22
SPECIFICATION 22
SERVICE
INFORMATION 23
TROUBLESHOOTING 23
Copyright© 1991,Lowrance Electronics, Inc.
Allrightsreserved.
Allfeatures
and specifications subject tochange withoutnotice.
Allscreensinthismanual aresimulated.
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4. Theboatmustbe
moving
at
aslowtrollingspeed
toseefisharches.Iftheboat
ismotionless, fish
stay
inthecone,
showing onthe
display
as
straight
horizontal
lines.
ELECTRICALNOISE
A
major
cause ofsonarproblems iselectricalnoise. This
usually
appears
onthe
sonar'sdisplayas random
patterns
ofdots orlines. In severe cases, itcan
completely
coverthescreen withblack
dots,orcausetheunit
operateerraticly,
ornotatall.
Toeliminateorminimize theeffectsofelectrical noise, firsttry
todeterminethe
cause,Withtheboatatrestinthewater, thefirst
thingyoushoulddoisturnall
electrical equipment ontheboatoff. Makecertaintheengine isoff,also. Turn
onthesonar
unit,
thenturnASPoff. Thereshouldbeasteady
bottom
signalon
the
display.Nowturnon each
pieceofelectrical equipmentontheboatandview
theeffectonthesonar's display.For
example,turnonthebilgepump
andview
thesonar
displayfor noise. Ifnonoise ispresent,
turnthepumpoff, thenturn
ontheVHFradioand
transmit. Keepdoing thisuntilallelectrical equipment has
beenturned
on,their
effectonthesonar
display
noted, thenturnedoff.
If
youfindnoiseinterference fromanelectrical instrument,trolling motor,
pump.
orradio, trytoisolatetheproblem. Youcan usually re-routethesonarunit's
powercable and transducercable away
fromthe wiring that is causing the
interference. VHFradioantenna
cablesradiate noisewhen
transmitting,
sobe
certaintokeep thesonar'swiresawayfrom
it. You may needtoroutethesonar
unit's
powercabledirectlyto
the
batteryto
isolate itfrom
otherwiring
ontheboat.
Ifno noisedisplaysonthe sonarunit fromelectrical equipment, then make
certain everythingexceptthe sonarunit Is turnedoff, then start the engine.
Increase theRPMwiththegearshift in neutral. Ifnoise
appears
onthe
display,
theproblem couldbeoneofthree
things;
sparkplugs, alternator, ortachometer
wiring. Tryusing resistorsparkplugs, alternatorfilters, or
routingthesonarunit's
power
cable
away
fromengine wiring. Again, routing thepowercabledirectly to
the
battery
helps
eliminatenoiseproblems. Makecertain tousethein-linefuse
supplied withthe unitwhenwiringthe power
cabletothebattery.
When nonoiseappears onthesonarunitafteralloftheabove
tests,thenthe
noise source Is probably cavitation. Many novices or persons with limited
experience makehasty
sonarinstallations which function perfectly
in shallow
water,
orwhentheboatisatrest. Innearly all
cases,
thecause of
themalfunction
will bethe locationand/or
angle
ofthetransducer. Thefaceofthetransducer
mustbe placed in alocation thathasasmooth flowofwateratallboat
speeds.
Read your transducerownersmanualforthe bestmounting position.
25
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Weakbottom echo,digitalreadingserratic,
ornofishsignals(cont4: INTRODUCTION
2.Electricalnoisefromtheboat'smotorcaninterferewlththesonar. This
causes
thesonartoautomatically increase itsDiscrimination ornoise
rejection feature.
Thiscancausetheunittoeliminate
weakersignals
such
as
fish
orevenstructure
fromthedisplay.
3. Thewater
maybedeeper
thanthesonar's ability tofindthebottom. ifthe
sonarcan'tfindthebottom
signalwhileit's inthe
automatic
mode,thedigital
will
flashcontinuously. Itmaychange therange tolimitsfargreaterthan
thewater
youarein. Ifthishappens, place
theunitinthemanualmode, thenchange
the
rangetoarealistic
one,
(forexample,0-100 feet)
andincreasethe
sensitivity.
As
youmoveIntoshallower
water, abottom
signal
shouldappear.
4. Check the batteryvoltage.ifthe voltagedrops, theunit'stransmitter
power
also
drops, reducing itsability
tofindthe bottomor
targets.
Bottom echodisappearsathighspeedsorerratic
dIgital
readingorweak
bottom echowhileboat Ismoving
1. Thetransducer
may
beinturbulentwater. Itmust bemounted in asmooth
flowofwaterin orderforthesonartoworkatallboatspeeds.Airbubblesinthe
water
disrupt
thesonar
signals,interfering with itsability
tofindthebottomor
other
targets. Thetechnical termforthis is'Cavitation'.
2.Electrical noisefromtheboat'smotorcanInterferewiththe
sonar. Thiscauses
thesonartoautomatically increase itsDiscrimination ornoiserejection
feature.
Thiscancausetheunittoeliminateweakersignals
suchasfishorevenstructure
fromthedisplay. Tryusingresistorsparkplugs orroutingthe
sonarunit's
power
andtransducercables away fromotherelectrical wiringontheboat.
Nofish
archeswhentheFish IDfeature Isoff:
1. Makecertaintransducerispointingstraight
down. Thisisthemostcommon
problem
ifapartial archisdisplayed. SeetheFish Archsectioninthismanual
formoreinformation.
2. Thesensitivitymay notbehighenough. inorderforthe unittodisplay
afish
arch,ithastobeabletoreceivethefish'sechofromthetimeitentersthecone
until
itleaves. ifthesensitivity isnothighenough, theunitdisplays thefishonly
whenitisinthe centerofthecone.
3. UsetheZoom feature, It ismucheasiertodisplay
fisharcheswhenzoomed
inonasmallrange ofwaterthanalarge one. Forexample, youwillhavemuch
betterluck
seeing
fisharches with
a30to60footrangethana0to60footrange.
This
enlarges thetargets,
allowing
thedisplay toshowmuchmore detail.
24
Welcome totheworldofsportfishing sonar. Your Lowrance X-20Ais
a highqualitysonardesigned forboth professional and novice users.
Thisunit has an automatic featurethat finds anddisplays
thebottom
depth,fish, andstructure. Asyoubecome
familiarwithyour
X-20A,you
can "fine tune"theunittothesurrounding
conditionsto getthemost
fromyoursonar.
Although
theX-20Ahasmanyfeaturesand functions,
thesimplekey-
board and operation modes makes it easy to use and understand.
Readthismanual andtakeitwithyouwhen
youuse
thisunit. itmakes
a
greatreferenceshould youneedit. Themoreyou knowwhen
youget
tothe
water,
themore
yourX-20Acan doforyou!
INSTALLATION
Mounting
installthe unitinany convenient location,provided thereis clearance
whentiltedforthebest
viewingangie. Holes inthebracket baseallow
woodscrew
or
through
boltmounting. Place a
piece
ofplywood onthe
backofthin panels tosecurethemounting hardware. Makecertain
there is enough room behind the unit to attach the power and
transducer
cables.
Youcanroute
the
power
andtransducercables
through
aoneinch hole
inthemountingsurface. First
passthetransducer
connectorand cable
upthrough
the hole. Thenpush thepowercable
wiredown
throughit.
After routing the cables, fill the hole with silicone rubber adhesive
(RTV). Offset
thebracket tocoverthehole. Routethecables through
theslotintherearofthe
bracket. Therearetwonotches inthebracket
thatcanbepunched out formore cables,ifnecessary.
NOTCIII
1
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PowerConnections
TheX-20A
operates
froma 12voltbattery system. Attachthepower
cable to an accessory or powerbuss. If you have problemswith
electrical interference, then attach thecable directlyto the battery.
Electrical interference shows as random dotsonthedisplaywhenever
theboat'sengine oranaccessory ison.
The powercablehas two wires, red is the positive lead and blackis
negative orground. Attachthein-linefuseholdertotheredwireonthe
power
cablewiththe
crimpconnector. Theotherendofthefuseholder
attaches to the batteryor accessory buss. If thecable is not long
enough, spliceordinary
#18
gauge
wireontoit. Becertain thatthefuse
holderis as closetothepowersource(battery or accessorybuss)as
possible. Thisprotects
thepower cableandyour
unitin theeventofa
short. Usea
3-ampfuse.
Thisunit has reverse polarityprotection. No damage willoccur ifthe
powerwiresare reversed. (However, the unit will not workuntilthe
wiresareattached
correctly.)
IMPORTANT
SERVICE INFORMATION!
If
your
unitisnot
working,
orif
youneedtechnical help, pleaseusethe following
troubleshooting
sectionbefore
contacting aservice centerorthe factorycus-
tonierservice
department.
It
maysaveyou
thetroubleof
returningyourunit.See
theHowToObtainServicesectionon page26ifyou need service.
SONARTROUBLESHOOTING
Unitwon'tturnon:
1. Checkthe
powercable'sconnection attheunit. Also checkthewiring.
2. Makecertainthe powercableiswiredproperly. Thered wireconnects
tothepositive
batteryterminal,
blacktonegative orground.
3. Checkthefuse.
4. Measurethe
batteryvoltageatthe
unit'spowerconnector. ltshould
beatleast
11volts. Itit
isn't,
the
wiring
totheunitis
defective,the
batteryterminalsorwiring
on theterminalsarecorroded,
orthe battery needscharging.
Unit
freezes,locksup,
oroperates erratIcally:
1. Electrical noisefromtheboat's
motor,
trolling
motor, oranaccessory maybe
interfering withthesonarunit.Re-routingthepowerand transducercables away
fromotherelectrical
wiring
ontheboat
mayhelp. Routethesonarunit's power
cabledirectly tothe
battery
insteadofthrough afuseblockor
ignition
switch
2. Inspect thetransducercableforbreaks,cuts,or
pinched
wires.
3. Checkboththetransducerandpower
connectors, Make certainbothare
securelyplugged
intothe unit.
Weakbottom
echo,digitalreadings erratic,ornofish signals:
1. Makecertaintransduceris pointing straightdown. Cleanthe face ofthe
transducer. Oil,dirt, andfuelcancause afilmtoformon
thetransducer,reducing
its effectiveness, Ifthe transduceris mounted inside thehull, besure it is
shootingthroughonly
onelayer of
fiberglass andthatitissecurely
bonded tothe
hull. Do NOTuseRNsiliconerubberadhesive orMarinete,e.
RED
FUSE
HOLDER
2 23
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thusmarked,youcan make your turnandcomebacktofishin exactly _.a1.J
theright spot. This is essential whenyou'refarfromshore on abig
lake. Unlessyoumarktheschool offishwhen
you're
over it, youmay
notbeabletofinditagain.
BAITFISH
Theimportanceofbaitfishto successful fishing can'tbe over-empha-
sized. They are theprincipal foodofallgame
fishinmostwaters.
Baitfish aretheplankton feedingforagefish, such as minnows and
shad. Baitfish canalso betheyoungofgamefish, suchas crappies,
bluegill,andbass.
Most baitfish concentrate withinfivefeetofthesurface wheresunlight
promotes the growth oftheplankton on which theyfeed. Onemethod
offishing istousetheunittofindthebaitfishfirst. Aschoolofbait
fish
willlook like a 'cloud" ontheunit's
display. Usually, gamefishwillbe
nearby,often directly
beneath theschool ofbaitfish.
SPECIFICATIONS
57/8"H x73/4"W
x37/16"D
1 3/4pounds
192kI-lz
275waifs
peaktopeak
34.4watts RMS
82db
temperature stabilized
200ma(lightsoff)
500ma(lightson)
9-15vdc
50x27
(verticalxhorizontal)
1350Total
.5"perminute(minimum)
32"perminute (maximum)
180 feet
KEYBOARDBASICS
This sectiongives a brief explanation of the keyboard. Read the
Operation
sectionforadetailed
description ofeachkey'soperation.
ON OFF
These
keys
turntheunit's
power
onandoff. Toturniton,
simplypress the ON key. Toturn itoff,press theOFF
key.
Pressing anykey generates atone or"beep." Thistells
youthattheunithasaccepted acommand.
flUPand DOWN ARROWS
Thesekeys are usedtoadjust
virtuallyevery featureand
function ontheunit. Usethesekeys
toadjust the
sensitiv-
ity, chart speed, range, zoomandchartalarm.
Dimensions
Weight
Transmitter frequency
Output Power (typical)
Receiver Sensitivity
OperatingCurrent
OperatingVoltage
Numberofpixels
DisplayScroll Speed
a
Maximum Chart Range
Maximum Digital Range 400feet a
22 3
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SENS.
Thiskeyand thearrow keys adjust
the
graph'ssensitivity.
-1 (The digital'ssensitivity is adjusted by theunit automati-
cally.) Thereceiverhas32steps
ofadjustment.
______ CHARTSPEED
IUIi'I Varythe speedofthe chart withthiskey andthearrow
- keys. Thereare5steps
ofchartspeed adjustment,
______ MODE
.Ip TheX-20Ahasfivedifferent"screens"ormodes ofopera-
tion. Usethiskeytoswitch between modes.
FISH l.D.
• Thiskeyturnsthe Fish 1.0.featureoffandon.
FISHALARM
Press both theFish1.0.andtheAUTO
key
at
"' the same time to
activatethe Fish Alarm.
Thisisanaudiblefishalarm.
AUTO
________ Turning the unit on enables the automatic mode. To
switchtothemanual mode, presstheAUTO
key. Youcan
return the unit to automatic at anytime by pressing the
AUTOkeyagain.
otherfisheventually
dieoutwhenstocked inlakesthatremaintoocold
during
thesummer. While some fish haveawider
temperature toler-
ancethanothers, eachhasacertainrange within which ittriestostay.
Schooling fish suspendedoverdeep
waterlieatthelevel thatprovides
this
temperature. We assume theyarethemostcomfortable here.
The temperature ofwaterin the lake is seldom constant from top to
bottom. Layers ofdifferenttemperatures form,andthejunctionof a
warmandcool layerofwateriscalled athermocline. Thedepth and
thicknessofthethermoclinecanvarywiththeseasonortimeofday. In
deep lakestheremaybetwoormoreatdifferent depths. Thermoclines
are important to fishermenbecause they are areas where fish are
active. Many timesbaitfish willbeabovethethermocline whilelarger
gamefishwill suspend inorjustbelow it.
TheX-20Acandetectthisinvisible
layer
inthe
water, butthe
sensitivity
willprobably havetobeturneduptoseeit.
SURVEYING A LAKE
Themostsuccessful anglers onanybody
ofwaterarethosewhofishit
dayafterdayandyearafter year. Eventually,theylearnthehotspots
that produce fish consistently. They discover through experience
where, andatwhatdepth,theycanexpect tofindthefish they wantat
any season. And they realizethat these productive areas change
throughout
theyeardepending onwaterlevel, temperature, food, and
otherfactors.
WiththeX-20A, anyone caneliminate guesswork andconcentrate on
the areas wherefish arelikely tobe. Even ifit'sthefirsttime onthe
lake!
Themost efficient
waytobecome acquaintedwitha
body
ofwateristo
survQy itwithyour unit. Startwith amapofthe lake, ifpossible, and
indicate
thepromising spots in relation tolandmarkson shore.
Asyougo aboutyoursurvey,your
unitwilltellyou the
depth
and
typeof
bottom. Itwillalsoreveal suspended fish.
Keepafewmarker buoys
intheboat, ready totossoverboard. When
theunit indicates aschool offish, throwthebuoy out. Withtheschool
4 21
RANGE
Thedepth rangeis changed with thiskeyand the arrow
•;hUtIa keys. Therangesvaryfrom0-5 feetto0-180feet.
(0-3metersto0-90meters -metricmodels)
CHARTALARM
Usingthis keyactivates thechartalarm. Abarappears on
the leftside of thedisplaywhenthe chart alarm is ad-
justed. Anytarget
that
appearsonthescreenbetweenthe
topandbottomofthechart alarm bartriggers
thealarm.
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WATERTEMPERATURE ANDTHERMOCLINES
Walertemperature has an important-if not controlling-influence upon
the activities of all fish. Fishare cold blooded and their bodiesare
always thetemperature ofthesurrounding waler. During lhewinter,
colderwaterslows down their metabolisrri. At this time,they need
aboutafourth asmuch foodastheyconsumein thesummer.
Most fish don't spawn unless thewatertemperalure
iswithin rather
narrow limits. Surfacetemperature meterssuchastheLDT-3000 helps
identify the desired surface waterspawning
temperatures forvarious
species. Troutcan'tsurviveinstreams
that geltoowarm. Bassand
OPERATION
SENSITIVITY
TheunitisintheAUTOSEARCH mode whenit'sfirst turnedon. The
micro-computer automatically adjusts
thesensitivity and rangetofind
andlockontothebottom. Thedigitaldepth
flashes"0"untilitfindsand
locksontothe bottom. You can leavethe sensitivity intheautomatic
mode ormanuallyadjust ittosuit conditions.
Youmay needtoincrease the
sensitivity
toshowfishsymbols when
the
unitisinautomatic. Todothis,firstpresstheSENS. key. Theletters
'SENS"willflashonthe
right
sideofthe
display. Averticalbarappears
ontheleftsideofthescreen. ( See below.) This indicates thesensi-
tivitylevel. Toincreasethesensitivity, pressand holdtheuparrow
key
until thesensitivity isat thedesired level. The downarrow key de-
creases
sensitivity in thesamemanner. Notice howthesensitivity bar
moves asyou change settings. It will move upwhenthesensitivity
is
increased. You'll also see the change on thedisplay. After you've
finished
settingthe sensitivity level,
theletters "SENS"andthe
sensitiv-
itybarwilldisappear aftereightseconds.
83°
7B°
SURFACE LAVER
ABSORBS HEAT
FROMTHESUN
EPILIMNION
770
760
75°
THERMOCLINE
SENSITIVITY
BAR
MostPRODUCTIVE
ZONEFOR FISHING
68°
VARIESINDEPTh
DUETO
WIND,
56°
50°
47°
20 5
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Withhighsensitivity settings,
asecondbottomecho(second echo) may
appear. Thisisnormal. It'scaused
bythe returning signal reflecting off
thesurface ofthewater. Thenitmakes asecondtrip tothebottomand
backagain.
Remember, whentheunit'sautomatic feature ison, thereceiver's sen-
sitivityautomatically adjusts
tothesurrounding conditions. The micro-
computerplacesitatalevel slightly
abovetheminimum required topick
upthebottomsignal. However, it'spossible tochange
thesensitivity
levelwhiletheunitisinautomatic. Thismay
bedesirable if thesensitiv-
itylevelisnothighenough
toshow
fishorothersmall detail. Theunit
willincrease thesensitivity topickupthebottom
signal, thenaddin
the
level
youprogrammed.
Toadjust thesensitivity whiletheunitis in automatic, simplypressthe
SENS. key. Thenpress eithertheuparrowkeytoincrease
it,orthe
down arrow key to decreaseit. As you press the arrow key, the
sensitivity bar moVes up or down, according to the sensitivitylevel
chosen.
Youcanadjust the
sensitivity
inthe
samemanner whentheunitisin the
manual mode.
Verysmallfishprobably
willnotarchatall. Medium sizedfishwillshow
a partial arch, or a shape similarto an arch ifthey'rein deep water.
Large
fishwill
arch, butturnthe
sensitivity upindeeperwatertoseethe
• arch. Because of water conditions, such as heavy surface clutter,
thermoclines, etc., the sensitivity sometimes cannot be increased
enough togetfisharches.
Oneofthebest ways to get fish arches is to expand or "zoom" a
segment ofthewater. For
example, from45to60feet. Thesmallerthe
segment, thebetterthescreen resolution willbe. Forthebestresults,
turnthe
sensitivityup
as highaspossiblewithout
gettingtoomuchnoise
onthe screen. Inmediumto deep water, this method should workto
display fish arches.
.—BOAT'SDIRECTION OFTRAVEL
U
AUTO
SENS
RANGE
20
SENSrnVITY
BARN I-
14.: FISH ID
4L
EU .
. U •: .
A B .
C
6 19
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Both 8 degree and20 degree transducers giveaccuratebottomread-
ings,even thoughthe bottomsignal is much wideron the 20degree
model. Thisisbecause
youare seeing
moreofthebottom. Remem-
ber,
theshallow edge ofthesignal shows
youthe
truedepth. Therest
ofthesignaltellsyouwhether
youareoverrocks, mud, etc.
SIGNALINTERPRETATION
Yourunit
gives
anaccurate
pictureofthebottomthat
your
boatispass-
ing. Abottomoffirm sand,gravel,shell, or hardclay returns a wide
bottom signal. Iftheautomatic featureisoffandthebottom signalnar-
rows, then it means that you have moved overamudbottom. Mud
absorbs thesound wave and returns a weak signal. Turn up the
sensitivitytoseeabetterbottom
signal.
Big rocksor stumps on a smooth bottom send back signals above
the bottom level signal. The height of the signal dependson the
target'sheight. Asyoupassoverapost, ftshould beclearly visibleas a
short line extending above
thebottom
signal.
A steep slope returns a wide signal, the steeper
the wider. Signals
returned fromahighunderwater cliff are usuallythewidest ofall.
Brushusually lies onthebottom
andshows upas clumpsrising
above
the bottom signal. Brush signals looksimilar to large rocks; however
theirsignal isnot asstrong
as rock.
FISH ARCHES
Fisharches arecreated
whenthe coneof sound passes
over afish.
Thedistance toafish whentheconefirststrikesitis shown as "A"on
the next page. When the center of thecone strikes the fish, the
distance isshorter, as shownin"B". As theconeleaves thefish, the
distance increases againas shown in "C".
Whenthe Fish l.D.featureisoff,thedepthofthewaterwill affectthe
sizeandshapeofthe fish arch duetotheconeangle diameter. For
example, if the cone passesover afish in shallow water,the signal
displayed ontheunitmaynot arch atall. Thisisduetothenarrow
cone
diameterandthe resolution limitations ofthedisplay!
CHART
SPEED
At
power
on,
thechartspeed scrolls atapresetspeed. Tochange
the
speed, pressthe
CHARTSPEED key. Theword"CHART"
willflashon
the right sideofthedisplay. Averticalbarwillalsoappearontheleft
sideofthescreen. This indicatesthecurrent
chartspeed. Next, press
the up arrow key ifyouwishto increase
the chart speed. Pressthe
downarrow keytodecreaseft. When the chart reachesthedesired
speed, release.the
key. Therearefivesteps
ofchart
speed. Whenthe
chart
speedreaches itsmaximum orminimum level,
theunitwillsound
atone.
Toviewthechart
speed
withoutchanging it, presstheCHART
SPEED
key. Thechart speed barwillappear
foreightseconds.
Attimes it is desirable to stopor "freeze"the displayto examine an
echobeforeitscrolls off
thescreen. Pressing theSENS. andCHART
SPEED keys atthesametimewillfreezethe
display. Pressthe
SENS.
and CHART SPEED keysagainto startthedisplaymoving atthelast
chartspeed selling. Ifthe
digitalsonarison,thebottom depthwillstill
be
displayed. Thedigital
doesnotstop
whenthechart isinthe
"freeze"
mode.
18 7
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RANGE TRANSDUCERS AND CONEANGLES
The range automatically changesto keep the bottom signal on the
displaywhentheunitisin automatic. Therangecannot bechanged
whentheunitis in the automatic mode. Therange can bechangedin
manual mode. There aresixranges
available: 0-5, 15,30,60,120, and
180 feet. (Metric units:
0-3,6, 15, 30, and 45meters.) To changethe
range, firstmakecertainthewordAUTO
isoff. Thenpress theRANGE
key. ThewordRANGEwillflashontherightsideofthescreen. Next,
press
the
up
arrow
keytoswitchtoashallower
rangeorpress
thedown
arrow keyfora
deeperrange. Therange annunciator willstopflashing
eightseconds afterthelast keywaspressed.
ZOOM
-Automatic
operation
UsetheZoomfeaturetoincreasethesize ofthe
targets
onthe
display.
It works by enlargingthe bottom half of the selected range. For
example, ifthe range is0 -60feet andthezoomkeyispressed,the
new range willbe30-60feet. Iftheunitisin automatic,thebottomwill
be
tracked inthis30footwindow. Therearetwoexceptionstothisnile:
1) If you'reonthe0-15'rangeandpressthezoom key,thenewrange
will be10-15'. 2) Thereis nozoomonthe0-5' range.
8
Thesound waves fromthetransducer
spread outinto the waterin a
cone shaped beam. Thislooks much likethebeam fromaflashlight.
Theangle between theoutside
edges oftheconeistheconeangle.
Lowrance offers achoiceoftransducers with either an8or20degree
coneangle. Typically, wideconeangle
transducers (20 degrees) are
idealforoperating in shallowtomediumwater depths. The20degree
coneangle allows
you
toseemoreoftheunderwater world. In15feet
ofwaterthe20degree conecoversanareaabout sixfeetacross. The
8
degree
transducer
covers
onlyabout atwofootcircle.
The20 degree transduceris almostalways the bestto use in fresh
water, the8
degreemostly
insaltwater. Ina
deep water
environment,
(300feet-fresh water,100 feet -saltwater)
the narrow coneangleis
moredesirable. Since the sound energy
is concentrated inasmaller
area, itcan penetrate tomuch deeperdepths.
17
50'
100'
150'
200'
8 Degrees
-
U
AUTO
RANGE
20
FISHID
Lw
30
AUTO
Lw
ZOOM
FISHID
50
EU
20Degrees
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MODE 5 - All chart, High
Speed Scroll.
Inthis mode thechartscrolls
at high speed. The chart
speed can be adjusted with
the CHART SPEED key if
desired.
a) Chartusesfull screen.
b) Nodigitaldepth indicator.
c) NoFASTRAK.
d) No automaticoperation
al-
lowed.
e) No Fish l.D. feature or
FishAlarm
f) Chart alarm isallowed.
SIMULATOR
Yourunithasabuilt-insimulator. Allthat isrequired forthesimulator
tooperate isa12voltD.C.source. Thetransducer doesn'thaveto
beconnectedtotheunit.
Tostartthesimulator, firstmakecertaintheunitisturnedoff. Now
press anykey,(except theOFFkey)andpress
theON keyatthe
same time. Theeasiest
waytodothis istopressand hold akey
down, thenpress theONkey. Theunitshould startscrolling achart
signal across thescreen andthedigital depth display should
showa
bottom depth.
None
oftheunit'sfeaturesareaccessible whentheunitisin the
simulator mode.
Toturnthesimulator
off,presstheOFFkey.
To change thezoom range, first presstheZOOM key. The word
"ZOOM" flashesonthe right side of the screen..Nowpresstheup
arrow orthe downarrow keyto increase ordecreasethezoom size.
Forexample, iftherange
is0-60feet, pressing theZOOM keychanges
therange to30-60feet. Whiletheword"ZOOM'isstill flashing,press
the
up
arrowkey. This
changes the
zoomrange from30feetto15
feet.
Presstheuparrow keyagain, andthezoom
rangechanges tofivefeet.
Toturnthezoom featureoff,simplypress theRANGE key
ZOOM -ManualMode
Zoomoperates differently whentheunitisinthemanual mode. First
press
theZOOM key. Thebottomhalfoftherangeisenlarged, justlike
the automatic zoomfeature. However, ifyoupress an arrowkey, the
rangeshifts inonefootincrements. Thedownarrow
key
toshiftsthe
rangedownin onefootincrements. Theup
arrowkey shiftstherange
upinonefootincrements. Forexample, if
the unitisonthe 0-60foot range, andthe _______________________
manual mode is on, pressing the zoom ________ _____
key, then the down arrow keyonce will
movethe30-60'
range
to31'-61'. Thebest AUTO
way to usethis feature is to changethe RANGE
range to a smallerone, then press the
zoomkey, shift therangeuntil theareais
displayed thatyouwantzoomed. Forex-
ample, ifthe bottom depth is50 feet, and
youwishto enlarge the areaimmediately
above it, first change the range to 0-30
feet. Nowpressthezoomkey. Finally,
pressthedownarrow keyuntilthebottom
appears. Now you have a fifteen foot
zoomwindow around thebottom
signal. _____________________
DIGITAL
Built inside the Fishl.D. II isacompletedigital sonar. Itautomatically
discriminates between thevalid bottomechoesandfalseechoes
from
fish,thermoclines, or othersignals. Thedigital display
willshow only
thebottomdepth. At
poweron,
the
digital
flashes"0"untilithas"locked
on"tothebottom.signal.
-. •10
AUTO
RANGE
20
___LID
ASH ID
Lw
Eu
16 9
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FISHI.D.
TheFish 1.0.featureisautomatically onwhentheunitisfirstturnedon.
Thecomputer insidethe
unitanalyzes allechoes,filtering outunwanted
signals. Ithelps
eliminatesurface clutter, thermoclines, andotherun-
desirable signals. The remaining suspendedtargetsareusuallyfish.
Targets
that are identifiedby theunit as fish are displayed as small,
medium,or large fish symbols on the display. These symbolsare
shown according totherelative sizeofthefish asseen by theunit. The
Fishl.D.featurecanonlybeusedin automatic. Ifyouwishtoturnitoff,
orbackon
again,press
theFISHI.D.key. If
youpress
the
FISH 1.0. key
whentheunitisinmanual, itwillputitin automatic andenabletheFish
1.0.feature.
Toshow fishsymbols, you mustbetraveling at a slowtrollingspeed.
Thereshouldbesomemovement ofthe _____________________
boat for theFish 1.0. featureto work ________ _____
properly. AUTO
Ifyouhavedifficultyshowing fishsym-
bols,tryincreasing thesensitivity.
FISH l.D.FEATURE ON
NOTE: TheFish1.0.featurecannot
distinguish between fishandother
suspended objects
suchas
turtles,treebranches, trotlines, submerged
floats,
orotherinanimate objects.Themicro-computer inthisunitisso-
phisticated, butitcanbefooled. Themostdifficult challenge isindivid-
ualtreebranches extending outfromgroups ofbranches. Thesecan
bemis-identified asfishbytheFish 1.0.feature. Also, large amountsof
noisecanfool the Fish ID.feature. Thisisusuallycaused
by a poor
transducer installation.
AlthoughtheFish1.0.featureisn'tperfect, itcanbeavaluableaidtothe
fisherman.
MODE 3-Bigdigital.
a) Thedigitaldepth numbers
usethelowerquarter of the
display. The depth is dis-
played in tenthsof a foot to
99.9feet, then it isdisplayed
inwhole numbers.
b) NoFASTRAK,
MODE 4
-Depth only
displayed inlarge digits.
Nochart display.
10 15
£1
AUTO
RANGE
Is
- RANGE
20 PIE
EQ 83'I
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TheX-20Ahasfivedifferentscreen modes. Tochange modes, press
theMODE key. Keep pressing the MODE keyuntilthedesiredscreen
appears. Asummary 01thedifferentscreen modes follows.
MODE 1 - This is thede-
fault mode used when the
unitisfirstturned on. Ithas
thefollowing features:
MODE 2 . Thisisthesame
as mode 1 except it has
FASTRAK. Thisdisplays on
the right side ofthe screen.
Itconverts allechoestohori-
zontal bars when they first
appear
onthescreen. This
gives arapid update ofcon-
ditions directly under the
boat. Echoes are also
scrolled normally across the
display. The Fish l.D. fea-
tureisnotavailable withthis
mode.
AUTO
When theunit isfirst turnedon, the automatic feature isenabled. It
works automatically tofind and
display
thebottom depth. Thesensitiv-
ityand range
arealso adjusted tokeepthe
bottom
signal onthescreen
atalltimes. To turntheautomaticfeatureoff, simply presstheAUTO
keyonce. Theword"AUTO"willdisappear fromthedisplay, signifying
theautomatic sensitivity and chart rangefeaturesare off. This also
turnstheFish l.D.featureoffatthesametime. Thedigitalremains
on.
Toreturn the unittotheautomatic mode,press theAUTO keyagain.
Thiswill resetthesensitivity, soyou maywishtoincreaseittoseefish
orotherdetail. ThiswillnotturntheFishl.D.featureon. Youwillhave
topress theFish l.D. keytoturn iton. -
AUTOMAI1C
MODEON
ALARMS
Theunithastwodifferent
alarms, achart alarm and fishalarm. The
chart alarmconsistsofabarthatdisplays ontheleftsideofthescreen.
The alarm "chirps" wheneverthe unit detects an echo inside the
boundaries ofthebar.
FishAlarm sounds an audible alarm whenfish or other suspended
objects
aredetected. Itworksinconjunction withthe Fish l.D.feature.
Toseparatethe
alarms, thefishalarm's
tonesoundsdifferentthanthe
chartalarm. Bothalarms maybeusedatthesametime.
MODE
-
a) Small digitaldepth dis-
play in lowerleft corner. It
does not show tenths of a
foot. Normalchartdisplay.
b) NoFASTRAK.
a
AUTO
RANGE
2f1
FISHID
60
-.
i0
AUTO
RANGE
20
—
_40
ISO
14 11
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CHARTALARM
TosettheChart
Alarm, press
theCHARTALARM keyonthe
keyboard.
Thewords
"ChartAlarm"flashesinthelower
rightcornerofthescreen.
Averticalbaralsodisplays
onthe leftsideofthescreen. Itwill stayon
thescreenfor
eightsecondsorforeight
secondsafter
you
havefinished
adjusting
it. ThisistheChartAlarm's"window."
Anyechothatappears
betweenthe
topandbottomofthis barwill sound thealarm. Adjust
deependofthisbartomake asmallerorlargeralarm "window." The
shallowend isautomatically adjusted bytheunitsoitwon'tbetriggered
by surface clutterorotherfalsesignals. Next, press thedownarrowto
move thebottomofthebardeeper, orpressthe up arrow to moveit
shallower. Eight secondsafterthelastbuttonis
pressed, thealarm bar
willdisappear.
When the"ChartAlarm"signalison,thealarm isactive. If
youwishto
viewtheChartAlarmbar,simplypresstheCHARTALARM key. The
barwill bedisplayed foreightseconds. Anytarget
thatappears onthe
leftsideofthescreen intheareacoveredby thechartalarm bar will
trigger
thealarm.
Iftherangeischanged, theChartAlarmmayneed tobechanged also
sinceitdoesnottrackrangesettings.
ToturntheChart Alarmoff,presstheCHARTALARM key, thenmove
thebottomofthebarallthe
waytoitsshallowest positionusingtheup
arrow key.
FISH ALARM
Use
theFISH ALARMforadistinctiveaudiblealarm whenfish orother
susupended objects
aredetected
by theFISH 1.0.feature. Press the
FiSH 1.0. and the AUTO keys at thesametime. Thewords "FISH
ALARM"
displays
atthebottomright side ofthescreen. Theaudible
alarm soundseachtimethe FishID. feature detectsa fish or other
suspended object.. Thereisadifferent toneforeach fish symbol
size.
ToturntheFishAlarmoff, press theFISH 1.0. and AUTOkeys atthe
sametime.
SPEAKER
(Audio)
Thespeakercan beturnedon and offbypressing the up and down
arrow keys atthesametime. Wheneverit is enabled, a note symbol
appears ontheright centersideofthe
display. Thespeaker isenabled
when
theunitisturned
on. NOTE: Thisapplies tothealarmsonly. The
unitwill still soundatone whena keyis pressed andthe speaker is
turnedoff.
LIGHT
Alight allows
operation oftheunitatnight. Turning theunitoncauses
the lightstoflashforsixseconds. Press theRANGE andZOOM keys
atthesametimeandthelightswillstayon. Toturnthelightsoff,
press
theRANGE and ZOOM keysagain. Thelightswillalsogo outwhenthe
unitisturnedoff.
1,
12 13
0
AUTO
RANGE
E 20
FISH ID
CHART
ALARM
60
C)
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