Key benefits Three mode choices ISB, USB, and CW for versatile operation across different workflows. 0 to 55 MHz continuous tuning with 1 Hz step provides precise, repeatable frequency setting. Six bands mapped to common HF ranges for quick access: 3.8 MHz, 7 MHz, 9 MHz, 14 MHz, 18 or 21 MHz, and 27 or 29 MHz. 12 V input is intended for shorttime testing; prolonged use may cause board heating, helping prevent damage. Technical highlights Fine resolution at 1 Hz increments across the full 055 MHz range. Bandbased organization reduces tuning time during operation. Practical applications Ham radio bench work for receiver/transmitter alignment and experimentation. HF signal testing and calibration in a workshop or lab. Training and demonstrations on mode selection and band coverage for operators. Safety and operating notes Do not run the device on 12 V continuously; use briefly for testing to avoid overheating.