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Tucnak 4.71, published by OK1ZIA, is a cross-platform logging application purpose-built for VHF and HF amateur-radio contesting, offering operators a consolidated environment for recording contacts, tracking multipliers, and generating Cabrillo and ADIF exports required by major ham-radio event committees. Originally created to serve the Czech contest community, the program has evolved through six major releases to support international rulesets, including VHF, UHF, and microwave bands, and now runs natively on Windows, Linux, and macOS without additional emulation layers. The interface presents a streamlined entry grid that automatically populates gridsquare, distance, and bearing data when a callsign is typed, while real-time dupe checking and serial-number assignment reduce operating errors during high-rate activity. Built-in networking allows multiple stations to share a single log over LAN or Internet, enabling multi-operator or multi-transmitter categories, and integrated rotator and CAT control streamline antenna pointing and frequency tracking. Post-contest tools provide scoring summaries, band breakdowns, and customizable certificates, and the logger can export logs in formats accepted by the ARRL, IARU, and national VHF contests. Because the source code is open, experienced users can adapt the database schema or add new contest definitions without waiting for vendor updates. Tucnak is available for free on get.nero.com, with downloads supplied through trusted Windows package sources such as winget, always delivering the latest version and supporting batch installation of multiple applications.
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