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


  • Frequency coverage:   7.0 – 7.2 MHz on 40m ;  14.0 – 14.35 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 (USB for FT8 etc. digital modes) on 40m, USB on 20m, (CW Interface optional).
  • 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: 8 W on 40m, 4W 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.

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

Choose SSB only or SSB and CW option:

160,00 €

150,00 €

  • 0,35 kg
  • Available
  • Ships within 3-5 days

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.

40,00 €

  • 0,15 kg
  • Available
  • Ships within 3-5 days