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DR-4020 DUAL BAND QRP DIGITAL RADIO
Assemble Instructions
The kit consists of two PCBs, one for the control board and the other for the mainboard. All
components on the control board have been installed and tested. There are two integrated
circuits and four crystals on the main board are patch components, and the rest are common
leaded components. It is easy to install. There are only four inductors to be adjusted in the
kit. It can be worked as long as there is no error in the component soldering,and no components
issues.
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Summary of Contents for Venus DR-4020
- Page 1 DR-4020 DUAL BAND QRP DIGITAL RADIO Assemble Instructions The kit consists of two PCBs, one for the control board and the other for the mainboard. All components on the control board have been installed and tested. There are two integrated circuits and four crystals on the main board are patch components, and the rest are common leaded components.
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Page 2: Components List
Components List ITEM Part number Marks SA602 Polar IC1、IC2 Resistor R5、R6 Resistor Resistor Resistor 1.2K Resistor 2.2K R1、R2 Resistor R4、R10、R11 Resistor 2.2M diode 1N4148 Polar D2、D3、D4、D5 diode 1N5817 Polar NE5532 Polar Crystal 4.9152M X1、X2、X3、X4 Resistor row B06-222 Resistor row B08-223 Relay EA2-12NU Polar... - Page 3 Monolithic capacitor 150P（151） C3、C46 Monolithic capacitor 220P（221） Monolithic capacitor 330P（331） Monolithic capacitor 470P（471） Monolithic capacitor 1000P（102） C26、C50、C52 Ceramic capacitor 0.01（103） C22、C24、C39、C40、C45 Monolithic capacitor 0.1（104） C8、C9、C10、C17、C18、C20 C25、C27、C41、C42...
- Page 4 ITEM Part number Marks Electrolytic capacitor 10uF C23、C28 Polar Electrolytic capacitor 100uF C29、C30、C43 Polar Inductor 4.7uH L1、L2 Transistor DTC143ZSA Q1、Q2、Q3、Q4、Q5、Q6、Q7 Polar Transistor 2N4401 Q8、Q9、Q10 Polar Regulator 78L05 78L05 Polar Regulator 78L06 78L06 Polar AF transformer 600:600 T1、T2 Inductor 10uH Power switch PS-22F02 Toroid inductor T37-2 L8、L9...
- Page 5 The kit has three inductors that require the user to wind it first: The inductor L8 is wound with a yellow enamel wire 10 turns, and the inductor L9 is wound with a red enamel 12 turns, see photo. The T3 transformer is an 8:2 transformer with a primary red envelope wrapped around 8 turns, a secondary with a yellow enameled wire wound around 2 turns, and a primary (red wire) welded to the two pads near the front panel (near C39), secondary (Yellow) soldered to the two pads near the back panel (near 78L05).
- Page 6 After installing the components on the mainboard, mount the rear panel and fix the Q11, solder the Q11, and subtract the excess pins. The Q11 should be insulated from the panel with insulating pads and insulating particles. Please refer to the photo below.
- Page 7 Solder the control board and cut off the excess pin section to install the front panel. The photo of the installed kit is as follows:...
- Page 8 The current meter can not only see the brightness of the transmission indicator TX is roughly adjusted. Please refer to the instruction manual for adjustment and operation of the kit. Wuxi Venus Information Technology Co., Ltd...