Applicable to Quansheng K5/Quansheng K6 with S14732 soft board FPC, dual filtering (pre-selected frequency/bandpass) + dual amplification (high-frequency/audio) Upgrade content: 1. Add audio amplifier to solve the problem of extremely low SSB single-sideband volume, with obvious effect. 2. Redesign FM and HF bandpass filters, FPC board with IPEX interface, simpler installation 3. Add ESD tube at the input end for electrostatic protection and strong signal protection during dual-antenna UV segment transmission. 4. Use FPC soft board with a thickness of 0.12mm, safe and reliable without short circuit, and installation does not support speakers. 5. Use high-quality high-frequency winding chip inductors with high Q value, low internal resistance and strong filtering selectivity. 6. Dual antenna solution, add an additional level of bandpass filtering at the antenna input 7. The FPC soft board uses a double-sided disk, which is more convenient to connect to the original machine. Applicable models: Applicable to Quansheng UV K5/K6 Includes: Walkie-talkie modification board*1