1. Add an audio amplifier to resolve the difficulty of extremely low volume of SSB unmarried sideband, and the impression is obvious. 2. Redesign FM and HF bandpass filters 3. An ESD tube is added to the input terminal for electrostatic protection and strong sign protection when transmitting in the UV part of twin antennas. 4. Use FPC gentle board, the board thickness is 0, secure and reliable without brief circuit, and the establish would not assist the speaker. 5. Use high quality high-frequency wire-wound chip inductors with immoderate Q value, small inner resistance, and strong filtering selectivity. In the dual-antenna solution, an extra point of band-pass filtering is added to the antenna input end, and a feeder and SMA head are used to an HF autonomous antenna from the LED, which does not impression the UV functionality of the machine. The FPC comfortable board makes use of a double-sided disk, which is easier to connect to the machine. Applicable models:For Quansheng uv k5/k6 Due to diversified batches, there might even be differences in product appearance, color, and printed text, which will not impression the use. Colour:Orange Material:PCB Package Contents: 1x SI4732 Board 1x 2M Expansion Chip Only the above package content, assorted merchandise usually are not included. Note: Light reflection and diversified reveals may cause the colour of the object within the picture slightly various from the real thing. The dimension allowed error is +/- 1-3cm.