Ham Engineering

Ham Engineering is the engineering bench for amateur radio — antenna and feedline maths, circuit design, propagation and a deep reference library, all completely offline. No account, no ads, no tracking, and not a single network call.

ANTENNAS

• Half-wave dipole with adjustable k (velocity) factor, quarter-wave and 5/8-wave verticals, ground-plane radials, end-fed half-wave, random wire, full-wave loop and a 3-element Yagi estimator

• Matching: L-network, Pi-network, quarter-wave transformer, balun/unun ratios and stub matching

• Antenna Lab — a live elevation radiation-pattern plot with directivity, realized gain, takeoff angle, beamwidth, front-to-back, mismatch loss, feedline loss and system gain, each explained

• Grid Compass that rotates with your phone, showing beam bearing and distance from your grid to a target grid

• Antenna gallery — every common type drawn as scalable vector art, with what it is, what it is for and what to watch out for

FEEDLINES & RF

• Coax loss by cable type, frequency and run length; velocity-factor electrical length

• SWR from forward/reflected power, plus return loss and mismatch loss

• Antenna A/B comparison and receiver noise-floor estimation

• RF power conversions: dBm, watts, ERP and EIRP

• Propagation: free-space path loss, radio horizon and Fresnel-zone clearance

• NanoVNA and tinySA quick-start guides, and a coax + connector gallery

CIRCUITS

• Ohm's law, series/parallel resistance, voltage dividers, RC and RL time constants

• Reactance, LC resonance, Q and bandwidth, stored energy

• RC and LC filter cutoffs, a constant-k Pi/T filter designer, a bandpass/notch calculator and a Butterworth low-pass designer

• Resistor, capacitor and inductor code decoders, an AWG wire table and a 555 timer calculator

• A live RLC resonance lab and a 50-part component gallery

REFERENCE & EXTRA

• Filterable amateur band plan for ITU Regions 1, 2 and 3

• Unit converters including watts, dBm and microvolts

• Comparison tables for coax, connectors, antennas and batteries

• Tools-and-gear and rig-controls galleries — what every knob and button is called across manufacturers

• Maidenhead grid tools and great-circle beam headings

• 300+ searchable tips, 40+ formulas, a rich glossary and a constants reference

• Curated external links to major retailers, brands and references

BUILT FOR THE BENCH

• Nearly 200 illustrations drawn as scalable vector art — nothing to download, everything sharp at any size

• Works fully offline. The app makes no network calls at all

• Export any panel or diagram as a theme-aware image to share or file

• An (i) explanation on every panel — this is a tool and a guide, not a quiz

• Light and dark themes, adjustable font size, weekly tips and in-app version history

• Your callsign, grid and email stay on your device and are never transmitted

PERFECT FOR

• Licensed operators designing, building and tuning antennas

• Anyone putting up a first dipole or vertical and wanting the numbers right

• Homebrewers and kit builders working with filters, matching and components

• SWLs and newcomers who want the reference material without the exam drill

• Club elmers and anyone teaching antenna and RF fundamentals

PRIVACY

• Your callsign, grid and email are stored only on your device.

• No account, no sign-up, no ads, no analytics SDKs, no advertising ID and no tracking of any kind.

73 de A41UX

Yousuf AL Balushi — Unixeer, Oman