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
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