Amateur Radio Engineering Tools
Essential calculators, Morse code auditory keyers, QSL card designers, and RF instruments designed by Dr. Mahtabur Rahman (S21AMF) for cadets, DXers, and antenna builders worldwide.
Interactive Morse Code Keyer & Auditory Trainer
Play real CW audio tones at customizable speeds (WPM) or practice straight-key sending
Manual Straight Key Pad
Click & hold below or press Spacebar to key the transmitter manually
🎧 Auditory Recognition Practice
Score: 0 / 0Listen to the randomly generated Morse character or callsign, then type what you heard to test your ear!
Official International Morse Code Chart (ITU-R M.1677)
Multi-Antenna Construction Calculator
Precision wire & tubing dimensions for Dipoles, Inverted-Vs, Verticals with Radials, EFHW, 3-Element Yagi, and J-Pole antennas
Interactive Ham Radio QSL Card Generator
Design, customize, and export high-resolution printable QSL confirmation cards for worldwide radio contacts
VSWR & Reflected Power Calculator
Calculate Voltage Standing Wave Ratio, Return Loss, and Transmitted Efficiency
Bi-Directional Maidenhead Grid Converter
Convert Lat/Long → Grid Square or Maidenhead Grid → Coordinates + Geographic Location
Coordinates → Maidenhead Locator
Maidenhead Grid → Coordinates & Location
Famous Ham Radio Stations & QTHs
Ohm's Law & Power Calculation Matrix
Enter any 2 parameters to calculate the remaining circuit values ($V = I \times R$, $P = V \times I$)
Live UTC Ham Clock & HF Band Forecast
Accurate UTC Zulu time for amateur radio logbooks, DX skeds, and ionospheric conditions