User Manual

JJ604
15
AddingFrSkytoaSpektrumDX8
15
UsingIt
1. FortheoriginalDX8DSM2/DSMXjustuseitasnormalleavingthenewpowerswitch
offandthejackunplugged.AbitofVelcroonthejackmakesahandystorage.
2. FortheFrSky,leavetheDX8off,pluginthejack,waittilltheDX8startsup
inSlave
modethenturnonthenewpowerswitch.BindtheFrSkyreceiverasusualusingthe
newpowerswitchandtheFrSkybindbutton.NeverturnontheDX8mainswitchif
youareinFrSkymode.
3. Notethatthemodelmemories arepartofthetransmitter,
notwhichmodeitis,in
soyoucanhavethesamemodelwithidenticallystoredsettingsuseeithera
DSM2/DSMXoranFrSkyreceiver.TheonlydifferencewillbethatModelMatchonly
workswiththeSpektrumsystem.
Thevoltageproblem
TheFrSkyDHTisspecifiedtooperatefrom6to13Volts.Thenormalbatteryinthe
SpektrumDX8isa4cellNiMHpackwithanominalvoltageof4.8V(unlikemanytransmitters
whichhavea7.2Vor9.6VbatteryandwhichworkfinewiththeDHT).Nothighenough.
So
whatisthesolution?
1. Thecheapandnastyapproach.
Bothvoltageratingsareabitconservative.MyDHToperatesproperlydownto
4.89Voltsatwhichpointitbeginscuttinginandoutandstopstransmitting.The
Spektrumbatteryactuallystaysabove5Vformuchofitsdischarge.The
DX8uses
justover70mAcurrentintrainermodewhiletheDHTplusFLD01usesjustunder
130mA.Totalcurrentdrainisthus200mA.Thegraphshowstheactualvoltage
curveofmyfullychargedSpektrum2000mAhNiMHpackwhendischargedata
constant200mA.
Ifyousetthe
DX8lowvoltagealarmto5.1V(greenline)youwill getabout100
minutesflyingtimeandstillstayatleast0.2abovetheFrSkyrequiredvoltage.A5
voltalarm(redline)willgiveyou200minutesbutonly0.1Vleeway.Besureto
checkthatyourDX8Tx
packvoltagereadingisreallyaccuratewithagoodquality
voltmeterbeforeyourelyonthismethodthough.Youwouldalsoneedtobesure
yourFrSkysystemwillworkat4.9volts.It’sriskyandnotforme.