DB4020 Dual-band 40 and 20M QRP SSB Transceiver Kit (CW Interface kit optional)


  • Frequency coverage:   7.0 – 7.3 MHz on 40m ;  14.0 – 14.5 MHz on 20m.
  • Note: You can tune a few hundred kHz below and above the bands, but downgrading the characteristics (SW broadcasting can be heard).
  • Tuning steps on two ranges: 10Hz-100Hz-1kHz and 10kHz-100kHz-1MHz.
  • Modes: LSB or USB (digital modes) on 40m, USB on 20m, CW Interface optionalVery robust against high SWR.
  • RIT function: without frequency limit
  • Power requirements: 12 – 14VDC 1-2A transmit, 0.15 – 0.4A receive.
  • Antenna impedance: 50 ohms.
  • Controls: Tuning-pushbutton. Volume.  RF attenuator.
  • Board dimensions: 180 x 140 mm.
  • Weight: (no enclosure): 0.3 kg.


  • Emissión: LSB/USB (CW optional).
  • RF output: 7 W on 40m, 3W on 20m (13.8V).
  • 2nd harmonic output: -45dB below the fundamental frequency.
  • Other spurious signals: -50dB or better below the fundamental frequency.
  • Carrier suppression: better than -40dB.
  • T/R switching: Relays.
  • Microphone type: Electret condenser (capsule included).  
  • Handheld Microphone/Speaker and connectors optional. See parts section, click here. 


  • Type: Superheterodyne. Balanced mixers.
  • Sensitivity: 0.2uV minimum discernible signal.
  • Selectivity: 4-pole crystal ladder filter, 2.4KHz nominal bandwidth (optional 500Hz narrow CW Filter).
  • IF frequency: 4.915MHz.
  • AGC: on the receive path according to the received audio.
  • Audio output: 250mW, 4-8 ohms.

Box not included. See below.

A medium experience level on radio and electronics assembly is required. It shouldn't be your first transceiver to build.

Choose SSB only or SSB and CW option.

155,00 €

  • 0,44 kg
  • Available
  • Ships within 3-7 workdays

CW Interface for DB4020

The "CW Interface" adds CW mode to the DB4020 transceiver kit. It is a complete circuit incorporates an automatic keyer with memories, side-tone monitor, TX / RX delay adjustment, independent signal power settings for 40 and 20m, switching for SSB / CW and the necessary control lines for the transceiver processor. A small board is included with the jack for the paddles key, the push button "CMD" and the “SSB/CW” switch.

The pack also includes an I.F. filter plug-in for CW. This filter has a narrow bandwidth about 500-600Hz which greatly improves the CW signals reception.


49,00 €

  • 0,15 kg
  • Available
  • Ships within 3-7 workdays


Box for DB4020 kit. Galvanized iron base and matt black painted aluminum top. 1mm metal of great robustness. Complete mechanization. Fully machined white front and back panels with black screen printing.

Download manual. 

Three different packages:

  • Complete: Base and Top. Front and Rear Panels. Knobs. Potentiometer on/off switch. PCB spacers. Screws. Mic. socket and plug. Wire. 50€
  • Semi: Base and Top. Front and Rear Panels. Screws. 40€ 
  • Panels: Front and Rear panel. 17€

50,00 €

  • 0,65 kg
  • Available
  • Ships within 3-7 workdays

If you want to make the enclosure, download the front and rear templates. 

Use the Sprint-Layout free viewer.

DB4020 PANELS.zip
Compressed Archive in ZIP Format 17.7 KB