# RF Engineer Toolkit — 45 RF & antenna calculators > RF and antenna calculators for engineers, technicians, and radio amateurs. (iPhone/iPad app by Vladislav Zhirnov.) - Source: https://appshunter.io/ios/app/rf-engineer-toolkit/id6745524609 (this page in markdown: same URL + `.md`) - Developer: [Vladislav Zhirnov](https://appshunter.io/developer/1476188065) - Category: Utilities, Reference - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 17.6 · 12 MB - Languages: American English, Arabic, Croatian, Czech, Danish, Dutch, Finnish, French (France), German (Germany), Greek and 21 more - Released: 2025-05-06 - Data updated: 2026-11-05 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/rf-engineer-toolkit/id6745524609/reviews.md ## What is RF Engineer Toolkit? RF Engineer Toolkit is the calculator set RF engineers, tower and DAS technicians, PCB designers, and radio amateurs reach for every day. 45 calculators, every formula unit-tested against Pozar, Balanis, ICNIRP 2020, FCC OET-65, and manufacturer cable data — with live results, locale-aware input, and no ads. FIELD AND SITE • VSWR, return loss, reflection coefficient, and mismatch loss from any one value or a wattmeter reading. • Cable loss with manufacturer coefficients (LMR, RG, Heliax, 9913), SWR loss, and ERP. • Link budget with FSPL, cable losses, gains, sensitivity, and margin. • Antenna downtilt and coverage, radio horizon, Fresnel zone with earth bulge and clearance. • RF exposure against FCC and ICNIRP limits, with safe distance for public and occupational exposure. • Antenna separation and co-site isolation, including required spacing. • Dipole, helical, and parabolic dish design, near-field boundaries, and Doppler shift. DESIGN AND LAB • Smith chart with series and shunt elements, lines and stubs, exportable as an image. • Impedance matching networks (L, Pi, T) with Q and bandwidth. • Attenuators (Pi, Tee, bridged-T, L-pad) with E24 and E96 values and real achieved attenuation. • LC filter designer: Butterworth and Chebyshev, low-pass, high-pass, band-pass, and band-stop. • Receiver chain: cascaded gain, noise figure, IP3, noise floor, and SFDR. • Amplifier linearity: P1dB, IP3, back-off, IM3, and PAE. • Microstrip, stripline, coplanar, and differential-pair impedance with synthesis and substrate presets. • Coax impedance, cable delay and phase, quarter-wave transformers, and skin depth. • Power dividers and directional couplers, S-parameter conversion, and intermodulation products. • Rectangular and circular waveguides with WR tables, cutoff, and guide wavelength. EVERYDAY CALCULATORS • dBm, dBW, W, V, dBV, dBµV, dBu, and dBi/dBd conversion. • Wavelength, reactance, resonance, time constants, Ohm's law, dividers, series and parallel circuits. FREE AND PRO 16 calculators are free, and every Pro calculator can be previewed. RF Toolkit Pro unlocks: • All 45 RF calculators. • Searchable calculation history with saved inputs. • PDF exports of calculation result sheets. • Custom cable and substrate libraries. Choose the plan that works for you: • Yearly subscription with a 7-day free trial. • Monthly subscription. • One-time lifetime purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the current period ends. You can manage subscriptions in your Apple Account settings. PRIVACY No accounts. No analytics. No ads. No tracking. Your calculation history stays on your device. Privacy Policy: https://zhsystems.me/privacy-rf-engineer-toolkit-privacy-policy-terms-of-use/ Terms of Use: https://zhsystems.me/turms-rf-engineer-toolkit-terms-of-use/ ## Key features - 45 RF and antenna calculators - Unit-tested formulas against industry standards - Field and site calculations (VSWR, link budget, RF exposure) - Design and lab calculations (Smith chart, impedance matching, filters) - Everyday RF conversions (dBm, W, V) - Free version with 16 calculators - Pro version with full access and advanced features ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Full version / year | $4.99 | per year | | Full version / monthly | $0.99 | per month | **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Remove ADS | $9.99 | one-time | ## Is RF Engineer Toolkit safe? Not enough ratings yet to assess RF Engineer Toolkit. ## Is RF Engineer Toolkit legit? RF Engineer Toolkit appears to be a legitimate app. The AppsHunter Legitimacy Score for RF Engineer Toolkit is 83 out of 100 points across 7 verification signals from App Store and developer data. ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/rf-engineer-toolkit/id6745524609/reviews.md ### 1/5 — dbm不能输入负值 *2025-11-20* 如何解决单位换算输入- 值付值 ## Frequently asked questions about RF Engineer Toolkit ### What is RF Engineer Toolkit? RF Engineer Toolkit is a mobile application that offers a collection of 45 calculators specifically designed for RF engineers, tower technicians, and radio amateurs. It covers a wide range of calculations for field, site, and lab applications. ### How many calculators are included in RF Engineer Toolkit? The app provides a total of 45 RF and antenna calculators. 16 of these are available for free, while the Pro version unlocks all 45 calculators. ### Are the formulas in RF Engineer Toolkit accurate? Yes, all formulas in RF Engineer Toolkit have been unit-tested against reputable sources like Pozar, Balanis, ICNIRP 2020, FCC OET-65, and manufacturer cable data to ensure accuracy. ### Does RF Engineer Toolkit have ads? No, RF Engineer Toolkit is ad-free. The developers have stated 'No ads' in the app's description, ensuring an uninterrupted user experience. ### What are the subscription options for RF Engineer Toolkit Pro? RF Engineer Toolkit Pro offers a yearly subscription with a 7-day free trial, a monthly subscription, and a one-time lifetime purchase option. Subscriptions automatically renew unless cancelled. ### Can I export calculations from RF Engineer Toolkit? Yes, the Pro version of RF Engineer Toolkit allows for PDF exports of calculation result sheets. This feature is not available in the free version. ### Is my calculation history saved in RF Engineer Toolkit? Your calculation history stays on your device and is searchable with saved inputs in the Pro version of RF Engineer Toolkit. There are no accounts, analytics, or tracking involved. ### What devices is RF Engineer Toolkit available on? RF Engineer Toolkit is available on iPhone and iPad devices, as indicated by its supported devices list. ## Version history (last 5 releases) ### 6 — 2026-11-04 6.0 is a rebuild. Every calculator now shows results as you type, accepts comma or point decimals, and every formula is unit-tested against published references. Ads are gone. New: Smith chart, impedance matching networks, attenuator designer, LC filter designer, receiver chain (NF, IP3, SFDR), amplifier linearity, antenna separation and isolation, power dividers and couplers, VSWR and return loss. New Pro features: calculation history with search and notes, PDF and text export, custom cable and substrate library, favourites. Fixed: RF exposure limits, Fresnel radius, cable loss coefficients, coax cutoff, CPW impedance, radar range, dB unit conversions and waveguide tables returned wrong values in earlier versions. All corrected and covered by tests. Existing "Remove Ads" purchasers: your purchase now unlocks RF Toolkit Pro for life. Thank you. ### 5 — 2025-10-16 Reduced ads + navigation bug fixed ### 4 — 2025-07-26 UI bugs fixed ### 3 — 2025-05-16 Some UI bugs fixed ### 2 — 2025-05-12 UI bugs fixed, rewarded sections fixed ## Apps similar to RF Engineer Toolkit | App | Rating | Price | Category | | --- | --- | --- | --- | | [Amateur Radio Toolkit 2025](https://appshunter.io/ios/app/amateur-radio-toolkit-2025/id6737146858) | 3.4 (16) | Free | Utilities | | [RF Toolbox: Ham Radio Tools](https://appshunter.io/ios/app/rf-toolbox-ham-radio-tools/id6774183334) | — | Free | Utilities | | [Cantennator](https://appshunter.io/ios/app/cantennator/id6752595083) | 5.0 (6) | Free | Utilities | | [Dipole calculator](https://appshunter.io/ios/app/dipole-calculator/id6753586053) | 4.3 (7) | Free | Utilities | | [Antenna Tools](https://appshunter.io/ios/app/antenna-tools/id6759701783) | 4.7 (21) | Free | Utilities | | [RF Tools](https://appshunter.io/ios/app/rf-tools/id525678686) | 3.0 (3) | Free | Utilities | ## More apps by Vladislav Zhirnov - [Facefitness - face exercise](https://appshunter.io/ios/app/facefitness-face-exercise/id1476188216) - [Neon Bleep Test PRO](https://appshunter.io/ios/app/neon-bleep-test-pro/id1487695486) - [Ideas fast log](https://appshunter.io/ios/app/ideas-fast-log/id1491519557) - [Concentrate and guess color](https://appshunter.io/ios/app/concentrate-and-guess-color/id1491661397) - [Postage stamps: all countries](https://appshunter.io/ios/app/postage-stamps-all-countries/id1497958107) - [Road signs: all countries](https://appshunter.io/ios/app/road-signs-all-countries/id1500810663) All apps by Vladislav Zhirnov: https://appshunter.io/developer/1476188065 ## Related topics [rf calculators](https://appshunter.io/ios/topics/rf-calculators) · [amateur radio toolkit](https://appshunter.io/ios/topics/amateur-radio-toolkit) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-05.*