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.

US customers email us for dollar price list

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.

US customers email us for dollar price list

45,00 €

  • 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. 

US customers email us for dollar price list

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

Comments: 7
  • #7

    Cyril F4HZB (Monday, 14 August 2023 15:05)

    I have built a MK2-ILER 40m kit (+ CW option) 2 years ago for my /P operations during holidays.
    It works fine, the feedback about audio from others ham is good, stability during QSO is quite good also (SSB or CW), it is not ultra stable but comfortable.
    Good PCB quality and components well packed, nice brochure to built the kit with a lot of pictures.
    U can buy it !
    I use my transceiver from 2 years, it is robust and reliable.
    Thanks and 73s to Javier EA3GCY from F4HZB.

  • #6

    Alfons, EA3BFL (Saturday, 27 August 2022 13:52)

    I asked for the cw extension. It arrived two weeks ago, it is very easy to assemble following the instructions, the automatic keyer is extremely easy to configure with a single button and the orders given with the paddle key. I am already making CW contacts all over Europe with ease. Good job Xavier

  • #5

    Alfons, EA3BFL (Friday, 05 August 2022 17:54)

    I have built the DB4020, without any problem following the instructions in the manual. I have successfully made contacts on ssb. But now I'm waiting for the option to operate on CW. Thanks Xavier, good job!

  • #4

    Jean-Paul David (Thursday, 28 April 2022 09:54)

    I have enjoyed like never before. I have big modern equipment but the DB4020 is now my favourite. Good job Xavier!!

  • #3

    Richard DL9OBU (Friday, 08 April 2022 12:35)

    Hello yls and om, and hello Javier EA3GCY,

    This is the fourth EA3GCY Kit I have built and operate.
    I built the 20M and 40M Iler, then bought the 20m DSB kit.

    Now this week i build the DB4020 with case and cw option.
    A wonderfull rig, all EA3GCY kits work well
    I was surprised on how good the audio quality was! Nice Display and Software.
    Receive good audio reports and the radio sounds fine on RX.

    Javier has done a great job with this kit.
    This is the real HAM radio feeling!!!! Homemade TX/RX !!! The best qso feeling an happyness

    I strongly recommend the TKEY-1 Keyer, DL-A1 DummyLoad and the Ilertenna antenna circuit !!!

    Thanks for the case option Javier ;-))

    vy 73 DL9OBU Ric

  • #2

    Frank ON6UU (Tuesday, 05 April 2022 11:36)

    Made the DB4020 some time ago, followed the building manual Javier wrote and all came together without problems. Power out is as described.
    I also added the CW option which gave me the radio I want for going to SOTA, GMA, POTA.

    This is not a newby kit but it is not really difficult either. It is great operating a radio you build yourself.

  • #1

    EA3GCY (Wednesday, 30 March 2022 13:55)

    Here you can leave your comments (started April 1, 2022)
    Thank you, 73 Javier EA3GCY