Apache Labs ANDROMEDA ANAN-7000DLE MKII - 6.6 Split Frequency Operation; 6.7 Puresignal; 6.7.1 Setting Up Puresignal

ANDROMEDAManual Page31of56
RXIndependentTuning:theencodershiftsthereceiverupordowninfrequencyfromtheVFO
setting,leavingtheTXunchanged.PressingtheencoderbuttonclearstheRIToffset.
TXIndependentTuning:theencodershiftsthetransmitterupordowninfrequencyfromtheVFO
setting,leavingtheRXunchanged.Pressing
theencoderbuttonclearstheRIToffset.
6.6 SplitFrequencyOperation
SplitfrequencyoperationisenablesusingtheSPLITbutton.Anindicatoronthedisplayisactivated
whenSPLITisenabled.
IfRX2isdisabled: VFOAwillbeusedforRX,andVFOBwillbeusedforTX
IfRX2isenabled: VFOAprovidesboth.TheRXfrequencyis
displayedasnormal;theTX
frequencyisdisplayedinthebandsegmentdisplay.
6.7 Puresignal
Puresignalprovidesanalgorithmtocorrectthenon‐linearity.Itdoesthatbymeasuringthe
differencebetweentheactualoutputandtheintendedou tput,andcorrectingtheTXsamplesto
allowforthedifference.ThisalgorithmwasdesignedbyWarrenPrattNR0VandleadstoTXsignals
20‐30dB“cleaner”than
thosewithnocorrection.Thisallhappensinthebackground,onceithas
beeninitialised.
PuresignaltakesasampleoftheTXsignalafterthehighpoweramplifier.ANDROMEDAincludesa
suitablesignalcoupler.Ifyouuseanexternallinearampl ifier,then youwillneedaddasuitable
coupler(which
couldbebuiltintoyouramplifier).
6.7.1 SettingUpPuresignal
1. Followtheguidancetosetupyourmicrophone,drive,antennaandfilterselectionfor
“normal”TX.
2. SelecttheMenu>Linearityform.ThePuresignalControlformwillbeshown.
3. ClicktheAmpViewbutton.YouwillseetheAmpViewform,readytoshowlinearity
corrections.
4. UsetheDriveencodertoselectthepowerlevelyouwanttooperateat.
5. Connectadummyloadwithappropriatepowerratingtoyourantennaconnector(ANT1,
unlessyouhaveselectedadifferent
antenna).
6. ClicktheleftmenubuttonuntilSetupisdisplayed.SetDuplextoon.
7. ClickTheconsoledisplayzoom2Xbutton
ClicktheTwo‐tonebuttononthefrontpanel.YouwillseeyourTXsignalastwotonesinthe
panadapterdisplayarea.Puresignalwillrapidlyadaptthesignaltoreduceintermodulationtomuch
lowervalues.
8. AfterafewsecondstheTX
displayshouldbestable.ClickTwo‐tonetoofftocompletethe
calibrationtest.
9. TheAmpViewbuttonwillhaveupdatedtoshowtheamplitudeandphasebehaviourofthe
amplifier,andthecorrectionthathasbeenmade.