RF measuring tools HAM radio equipment Arduino shields  RF transmitters RF loads Custom projects engflag
New product!!!




Automatic Antenna Tuner
Mfr. No: KT-005
Ultra portable QRP ATU
(expected availability: end Q2 2024)

(Last update: 27 February 2024) 
Mfr. No: KT-001K (kit)
New tool for RF experiments with Arduino Uno board
RF Dummy Load
Mfr. No: KT-002K (kit) or KT-002A (assembled)
Cost effective HF + 6 m band 50R RF dummy load

KT-001 picture
  • Higly integrated QRP HF band SWR bridge up to 20 W
  • Full compatibility with Arduino™ Uno board
  • Tandem Match configuration for best directivity
  • Only THT components for easy assembly
  • Easy access to measured values (P fwd  and P ref ) from
    ANALOG_IN input section
  • Germanium diodes for best sensitivity
  • Optional trimmers for precise adjusting
  • SMA connectors for size critical applications (optional
    also BNC connectors)
  • Equipped with ISP connector (2x3 pin header)  
  • Only passive components; no current consumption 

Mechanical Characteristics
  • Full mechanical and electrical compatibility with
      Arduino™ Uno Board and LCD 2x16 shields
  • Double-layer PCB
  • Double-sided connectors for Arduino 
  • Compact design: 68 x 54 x 12 mm  

KT-002 picture

  • Cost-effective HF + 6 m band 50R RF dummy load
  • 100 W continuous power handling
  • 300 W peak power handling capability
  • Low VSWR levels up to 54 MHz
  • UC-1 (PL-259) RF input connector
  • Built-in fan for reliable continuous operation
  • 2,1x5,5 DC input connector for the fan supply
  • THT components for easy assembly

Mechanical Characteristics
  • Compact design: 80 × 80 x 75 mm (with fan)
  • One layer PCB for easy components assembly
  • Solid aluminum baseplate for the input connector

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NCDXF/IARU Beacon Monitor
Mfr. No: KT-003K (kit) or KT-003A (assembled)
Useful tool for monitoring NCDXF/IARU beacons

KT-003 picture
Available from June 2023!


    • Usefull tool for quick HF propagation condition check
    • Time synchronized with built-in GPS receiver
    • SYNC LED for monitoring synchronization state
CTRL button for band change
    • External DC_IN connector
    • Optional battery operation: 3x AAA (holes for a battery holder)
    • Current consumption: 60 mA @ 9.0 V
    • Input voltage range: 5.5-18.0 VDC
    • THT components only for easy assembly

Mechanical Characteristics

    • Metalised front panel with set of LEDs and CTRL switch
    • Dimensions: 140 x 90 x 25 mm 
    • Two layers PCB
    • Wooden case available (sold separately)


    • Useful tool for easy HF propagation monitoring
    • Part of the radio shack 

NCDXF/IARU Beacon Monitor
Mfr. No: KT-003AB
Assembled version of KT-003 in wooden enclosure

    • Laser cut wooden housing (3 mm thickness) with mounting holes and spacers 
    • Ready to use device
CWduino QRP HF CW Transmitter
Mfr. No: KT-004K (kit)
Superportable CW transmitter for Arduino Uno board with keyer input



    • Highly integrated CW transmitter compatible with Arduino Uno board
    • HF band coverage: 80, 40 and 20 m (depends on version)
    • Class-E topology for high efficiency
    • Built-in 2nd harmonic notch filter to meet CFR requirements (-43 dBc)
    • 500 mW RF output power from 5 VDC Arduino’s power supply rail
    • 2000 mW RF output power at 9 VDC
    • Transmitter keying available from pin PD4 (IOL group)
    • Precise frequency adjustment via trimmer
    • Keyer input connector (mini-jack)
    • Equipped with SMA connector for size critical applications
    • Equipped with ISP connector (2x3 pin header) 
    • Most components are THT for easy assembly
    • Example projects for Arduino: CW Beacon and CW keyer available free for download
Mechanical Characteristics

    • Fully mechanical and electrical compliance with Arduino™ Uno board
    • Double-layer PCB
    • Compact design: 68 × 54 x 12 mm


    • Board for experiments with class E amplifier
    • Experimental CW  transmitter controlled from Arduino
    • Automatic keyer with integrated TX stage
    • Part of Arduino's controlled beacon (in CW mode)
    • Battery supplied experimental TX module
    • Part of a portable CW transceiver

Buy these products NOW on:        allegro.pl    or     ebay.com

>> For any technical questions please use a contact form on eBay and Allegro.

Products under development:


Antenna Impedance Monitor (KT-014)
Novel real-time antenna impedance monitor
(available Q3 2024)


Q: Is the printed manual attached with the kit?
A: Yes, every kit is shipped with printed assembly manual.

Q: How are the sets secured during transport?
A: Each set is packed in a cardboard box. We do not ship in bubble envelopes.

Q: Did you offer assembled boards?
A: For kits which are the most popular we offer an assembled version.

KT-001 SWRduino

Example file for the Arduino Uno and SWRduino board available in the Application Example document -->
PDF FileKT-001 datasheet [ENG version] 

PDF FileKT-001 SWRduino - Przyklad aplikacyjny [POL version]
KT-002 RF Dummy Load PDF FileKT-002 datasheet [POL version]
PDF FileKT-002 datasheet [ENG version]
KT-003 CW Beacon Monitor
==> available June 2023 !!!
PDF FileKT-003 datasheet [ENG version]
KT-004 CWduino

Example files for the Arduino Uno board available for free download:
- CW beacon
- CW keyer

Start your own project with ease!
PDF FileKT-004 datasheet [ENG version]
PDF FileKT-004 datasheet [POL version]  

KT-004 example files for Arduino
KT-005 Automatic Antenna  Tuner (ATU)
(under development)
KT-014 Antenna Impedance Monitor
(under development)


All products are proudly designed
and manufactured in Poland.

RF measuring tools HAM radio equipment Arduino shields
RF transmitters RF loads Custom projects
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