Three mode choices ISB USB CW Precise frequency control Supports 0 to 55 MHz continuous adjustment with 1 Hz steps for fine tuning and repeatable settings Six selectable frequency bands Band 1: 3.8 MHz Band 2: 7 MHz Band 3: 9 MHz Band 4: 14 MHz Band 5: 18 or 21 MHz Band 6: 27 or 29 MHz Power and usage caution Input voltage of 12 V can only be used for short time testing; prolonged use may cause heat to the board Key benefits Flexible operation with three modes to cover common RF testing and signal generation needs Wide frequency range with precise 1 Hz stepping enables accurate calibration and fine adjustment Clear band selection simplifies quick setup across HF bands Use scenarios RF hobby and ham radio projects: select a mode and band to generate or test signals across 3.8 to 29 MHz for receivers, antennas, or filters Bench calibration and equipment testing: use 055 MHz with 1 Hz resolution to verify frequency accuracy and stepping performance Educational demonstrations: illustrate mode operation, band selection, and precise frequency control in a classroom or lab setting Compatibility and performance Supports ISB, USB, and CW modes for versatile signal handling Designed for precise, repeatable frequency control across six defined bands Suitable for compact bench setups and RF experimentation within the specified limits Note For safety and board longevity, do not run on 12 V continuously; limit use to shorttime testing as indicated