Amateur Radio Utility Workbench

Calculate half-wave dipole dimensions from frequency

Suggested element lengths and spacing for multi-element yagis

Key dimensions for a J-Pole antenna

Quarter-wave vertical and radial dimensions

Resonance and efficiency for a single-turn loop

Circumference, side length and boom spacing suggestions

Equilateral loop height and wire length estimates

Driver/reflector lengths and element spacing overview

Wire length, counterpoise and 49:1 transformer suggestions

Two-element rectangle dimensions with fold-back spacing

Element schedule for broadband directional LPDA

Angle-aware inverted-V length calculator

Half-wave and quarter-wave sloper geometry

Recommended Beverage lengths and termination

Coils or capacitive hats for shortened antennas

Component values for L / Pi / T matches

Quarter-wave shorted stub length

Compute Turns ratio, required Inductance, and target Reactance.

Impedance transformer using a λ/4 section

Estimate gamma rod ratio and tuning capacitance

Shunt hairpin inductance and stub length

Single-layer solenoid inductance

Butterworth low/high/band-pass ladders up to 7th order for 50 Ω

Voltage-divider bias suggestion for small-signal stages

Friis equation with equivalent noise temperature

AL-based ferrite and iron powder core calculator

Solve one value from frequency, inductance, and capacitance.

Inverting, non-inverting and active low-pass gain

Astable and monostable 555 timing calculator

Calculate Pi and T Attenuator pad Resistors values for a target Attenuation.

Interactive Smith chart with SWR, Γ and impedance visualisation

Resistor colours, capacitor codes and series/parallel totals

Effective radiated power and EIRP conversion

Calculate safe separation distance from EIRP and regulatory limits

Estimate path loss from frequency and distance

Interactive VOACAP shortwave coverage view

Take-off angle, MUF and dipole height guidance

Great-circle distance and azimuth presets for VOACAP

Visualise twilight terminator for HF paths

Assess auroral propagation potential from Kp

Convert grid, latitude/longitude and distance

Estimate average current, runtime and battery packs for field radios

Recommended levels, gain and processing for common digital modes

Randomised amateur radio theory questions

Printable contact sheet with configurable columns

Play CW audio and practise quick copy

Track QSOs, multipliers and live score

Classic Q-signals with bilingual meanings

Regional allocations for HF/VHF amateur bands

Compare HF/VHF band availability by country

Look up ITU call sign prefixes by region

Lookup prefix entities with CQ/ITU zones

Structured response guide for amateur deployments

Convert frequency to free-space and coax electrical lengths

Convert SWR from power or impedance measurements

Insertion loss of common coax at a target frequency

Configure a home grid, preferred units and default callsign

Convert between dBm, watts and volts

Convert power, voltage, length, temperature and wavelength