AMRT Amateur Radio RF Toolkit

Ham antenna & VSWR calculators

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Antenna lengths, VSWR, coax loss, Smith chart, resistor codes & Maidenhead grid — 26 amateur-radio calculators and references, all fully offline. Your amateur-radio bench, in your pocket — and it works completely offline. AMRT brings the calculators and references hams reach for most into one fast, ad-free app. From cutting a dipole in the field to checking SWR in the shack, every answer shows the formula and assumptions behind it. ANTENNAS • Dipole, inverted-V, end-fed half-wave, vertical, J-pole, Yagi, cubical quad, full-wave loop & small magnetic loop • Lengths in metres, feet or fractional inches, with cut lists and diagrams RF & FEEDLINE • VSWR, return loss & mismatch loss • Coax cable loss and power at the antenna • Smith chart impedance matching • dB to power/voltage ELECTRONICS • Ohm's law, reactance, LC resonance, voltage divider • Series / parallel networks • Resistor, capacitor & SMD codes, AWG wire gauge LOCATION • Maidenhead grid square, distance & bearing • Look up your grid from GPS REFERENCE • Q-codes, RST, NATO phonetic alphabet, Morse, band plans MORE • Save calculations into projects and share results instantly • Home-screen widget: your callsign, home grid & UTC clock • Imperial and metric units throughout 100% offline. No account. No ads. Just the tools. Free to use the Dipole calculator — unlock every tool with a single one-time PRO purchase. No subscription. 73!

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In-App Purchases

The developer, APPRICODE SOFTWARE CONSULTANCY LTD., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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    Information

    Seller
    • APPRICODE SOFTWARE CONSULTANCY LTD.
    Size
    • 16.3 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Appricode Software Consultancy Ltd.
  • Developer Website
  • Privacy Policy

    • More by APPRICODE SOFTWARE CONSULTANCY LTD.

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