SI4732 FPC Mod Module for Quansheng UV-K5 / K6 Radio

SI4732 Chip & Crystal Oscillator FPC Modification Module for Quansheng UV-K5 / K6

Unlock the full potential of your Quansheng UV-K5 or UV-K6 handheld radio with this precision-engineered SI4732 modification module. Designed as a drop-in FPC (Flexible Printed Circuit) soft board upgrade, this kit adds HF shortwave full-band reception and SSB (Single Sideband) reception capabilities — transforming your radio into a truly versatile multi-band receiver. Compatible with both single-antenna and dual-antenna configurations.

Made in Mainland China.

What's Upgraded in This Module?

• Enhanced Audio Amplifier: Adds a dedicated audio amplifier stage to significantly boost SSB single sideband audio output — a noticeable improvement over stock volume levels.
• Redesigned FM & HF Bandpass Filters: Improved filter topology for cleaner signal separation and better out-of-band rejection across FM and HF bands.
• ESD Protection at Input Terminal: An ESD protection diode guards the antenna input against electrostatic discharge and strong signal overload, especially important during UV-band transmission in dual-antenna setups.
• Ultra-Thin 0.12mm FPC Soft Board: The flexible PCB design is just 0.12mm thick — safe, reliable, short-circuit resistant, and installs without pressing on the internal speaker.
• High-Quality Wire-Wound Chip Inductors: Features high-Q, low-resistance, high-frequency inductors for superior filtering selectivity and signal integrity.
• Extra Bandpass Filtering (Dual-Antenna): In dual-antenna configurations, an additional bandpass filter stage is added to the antenna input for enhanced HF performance. Includes a feeder and SMA connector for a dedicated HF antenna routed from the LED port — no impact on original UV performance.
• Double-Sided FPC Pads: Double-sided solder pads on the soft board make installation connections straightforward and reliable.

Specifications

• Compatible Models: Quansheng UV-K5, UV-K6 (FPC / V2 version)
• Chip: SI4732
• Board Thickness: 0.12mm FPC soft board
• Antenna Support: Single antenna & dual antenna
• Reception Modes Added: HF shortwave full-band, SSB single sideband
• Package Includes: 1 × Walkie-talkie modification board set

Why Upgrade with This Module?

Stock UV-K5/K6 radios have limited HF and SSB reception. This SI4732-based FPC module is the go-to hardware mod for amateur radio enthusiasts and hobbyists looking to expand their listening range without replacing their radio. The thoughtful design — from ESD protection to the ultra-thin board profile — ensures a clean, professional-grade installation.

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Further Reading

For guidance on amateur radio regulations and best practices, visit the FCC (Federal Communications Commission). For electronics safety standards and component testing, refer to resources at NIST (National Institute of Standards and Technology).

Frequently Asked Questions

Q: Is this SI4732 FPC module compatible with both the UV-K5 and UV-K6 models?

A: Yes. This modification module is designed specifically for the Quansheng UV-K5 and UV-K6 radios, supporting both the FPC/V2 board version in single-antenna and dual-antenna configurations.

Q: What new reception capabilities does the SI4732 chip add to my radio?

A: After installing this module, your Quansheng UV-K5 or UV-K6 gains HF shortwave full-band reception as well as SSB (Single Sideband) reception — greatly expanding the range of frequencies and signal types you can monitor.

Q: Will installing this module affect the original UV performance of my radio?

A: No. In the dual-antenna configuration, the HF independent antenna is routed via a dedicated feeder and SMA connector from the LED port, keeping the original UV band performance fully intact.

Q: Does the 0.12mm FPC board pose any risk of short-circuiting internal components?

A: The ultra-thin 0.12mm FPC soft board is specifically designed to avoid pressing on or shorting the internal speaker or other components, and the double-sided pad layout simplifies soldering for a safe, reliable installation.