The RF Explorer 4G COMBO+ is a compact, pocket-sized handheld spectrum analyzer offering continuous frequency coverage from 50 kHz to 4 GHz (expandable to 5.1 GHz via firmware), covering LF, MF, HF, VHF, and UHF — including all amateur radio HAM bands. Built into a robust metallic enclosure with a varnished finish, it features an internal LNA amplifier and selectable attenuator for excellent signal detection across a wide dynamic range, making it equally capable for indoor bench use and outdoor field measurements. Multiple spectrum analyser modes (Peak Max & Hold, Normal, Overwrite, Averaging) provide versatile signal analysis, while PRESET configuration and dedicated HELP/SET buttons ensure fast, intuitive operation. A high-capacity internal lithium battery delivers 10+ hours of runtime with USB recharging. Multi-platform software (Windows, Linux, macOS) and an Open Source API enable remote control, data logging, and high-resolution graphical display. Compatible with the RF Explorer Holder SLIM and Near Field Antenna Kit accessories. Key Features Frequency coverage: 50 kHz–4 GHz (expandable to 5.1 GHz via firmware) Covers LF / MF / HF / VHF / UHF — all HAM bands supported Internal LNA amplifier for high sensitivity Selectable attenuator for wide dynamic range Spectrum analyser modes: Peak Max & Hold, Normal, Overwrite, Averaging PRESET configuration & HELP/SET buttons for fast operation 10+ hour battery life (internal lithium, USB rechargeable) Multi-platform software: Windows, Linux, macOS Open Source API for remote control & data logging Robust metallic enclosure — pocket-sized & lightweight Compatible with RF Explorer Holder SLIM & Near Field Antenna Kit Technical Specifications Frequency range: 50 kHz–4 GHz (firmware expandable to 5.1 GHz) Coverage: LF / MF / HF / VHF / UHF Amplifier: Internal LNA Attenuator: Selectable Battery: High-capacity internal lithium, 10h+ runtime Charging: USB Software: Multi-platform (Windows / Linux / macOS), Open Source API Enclosure: Metallic, varnished finish
