Antiqa vs Ham Engineering

Identify antiques from a photo and explore what makes each piece special. Antiqa helps collectors and curious finders learn about vintage objects, their history and their possible value. SCAN & IDENTIFY Take a photo or choose one from your library. Get an AI identification with details such as the likely origin, period, materials and distinguishing features of the object. EXPLORE VALUE & CONDITION View an estimated value range and ask about wear, damage, care and factors that may affect value. Use clear photos and follow-up questions to explore an item in more detail. ASK THE AI ASSISTANT Chat about antique identification, historical context, signs of authenticity and preservation. Get practical explanations to guide your own research. SAVE YOUR FINDS Revisit scans in History and add selected pieces to your collection. Keep photos and item details together, browse your collection, and filter or sort your saved finds. BUILD YOUR KNOWLEDGE Browse articles about antique objects and works of art. Discover materials, craftsmanship and stories that can help you understand your next find. AI results and value estimates are for reference only. They are not a certified appraisal, authentication or guarantee of a sale price. Consult a qualified professional for important decisions. PREMIUM Some features require Antiqa Premium. Weekly and annual auto-renewing subscriptions are available. Prices and any trial eligibility are shown before purchase. Payment is charged to your Apple ID account. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Manage or cancel your subscription in your App Store account settings. Terms of Use: https://sites.google.com/view/antiqa-ai-antique-scanner/terms-conditions Privacy Policy: https://sites.google.com/view/antiqa-ai-antique-scanner/privacy-policy

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