Shortwave Standing Wavemeter Product Description This Shortwave Standing Wavemeter, built upon the G8GYW open-source foundation, is a perfect tool for shortwave radio enthusiasts. It features a built-in large capacity battery ensuring extended usage, making it an ideal companion for those who need longevity in performance. Experience reliable power and standing wave measurements with this robust device. Key Features Developed using G8GYW open-source design specifically for shortwave radio. Compact and portable design for easy transport and storage. Equipped with a large capacity lithium battery offering over 30 hours of usage. Supports serial communication, serial calibration, and USB firmware upgrades. Allows user-generated firmware and host computer programs, with expandable alarm output. Accurate power and standing wave measurements to one decimal place with data communication detailed to two decimal places. Specifications Frequency Range: 1.6MHz-30MHz Power Measurement Range: 0.1W-11W Accuracy: Better than ±5% (at 22°C; varies with temperature changes) Standing Wave Range: 1.0-19.9 Interface Type: SMA (external screw and inner hole) Communication & Charging: USB Type-C Dimensions: 63mm x 46mm x 19mm (excluding protrusions) Battery Capacity: 400mAh Usage Instructions When charging, the red light indicates charging and turns off when fully charged. Upon startup, version and battery voltage information display, transitioning to the power standing wave measurement interface after 2 seconds with battery level shown on the bottom right. Firmware upgrades for standard versions require a programmer. Package Includes 1 x Main Unit 1 x USB Type-C Data Cable 2 x SMA to BNC Adapters