DR-4020DUALBANDQRPDIGITALRADIO
Manual
DR4020isa40m/20mdual-bandradiofordigitalmodesthatrequiresacomputerwithspecific
applicationstouse.ItcanbeusedinthepopularFT8,FT4,JT65,aswellasPSK31,SSTVand
othermodes.
Specifications:
Dimensions88*38*124mm（buttonsareexcluded）
Weights320G
Operating
Voltage10-14VDC
Current50Ma@RX，700-800mA（12V）@TX
Frequency7.0-7.2MHz。14-14.35MHz
FilterBWUSB400-2800Hz
Output4-5W（12V）
Memory5memoriespereachband,userdefined
TXmethodVOX，Controlaudiovoltage：lessthan30mVp，fullpower：70mVp@40m，
120mVp@20m。
Thesignalinputsandoutputshavea1:1isolationtransformertoelectricallyisolatetheradiofrom
thecomputerandreduceinterference.
Connectingtocomputer
Externalpowersupply
Any10-14VDCsupplyorbatterypackwithacurrentgreaterthan1Acanbeconnectedviaanexternal
powerconnector.Polarityprotectioncircuitavailableinsidetheradio.
Antenna
Anyresonantantennacanbedirectlyconnectedtotheantennainterface(ANTENNA)withaBNC
connector,andanantennatunershouldbeconnectedbetweentheantennainterfaceandtheantennafora
non-resonantantenna.
3.5mmstereosocket(DATAIN/OUTonDR4020)
DR4020canbeusedwithPC,LaptoporRaspberryPi.
1,Whileusingalaptop,andifthereisonlyonecombinedAF/MIC
jack,pleasepayattentiontothedifferentwiringsofthe
computeraudiojacksbelow:
2,AnexternalUSBsoundcardmayberequiredifyouuse
RaspberryPitoconnecttoDR4020.
Operating
Powerswitch
PowerswitchPWROntheleftsideofthepanel,pressPWRtopoweron,pressPWR
againtoturnoff.
BandandFrequencyselection
ShortpresstherightVFOknobofthepaneltoselectbetween40metersand20meters.
RotateVF