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TAPRX-888

A simplified, HF-only software-defined radio (SDR) receiver based on the RX-888 — a proof-of-concept on a larger 6-layer board with improved thermal and RF layout.

Highlights

• HF-only (no VHF up/down converter)
• 6-layer PCB, 0603 passives, no bottom-side components
• Bypassable RF input filtering
• External reference-clock input with auto-switching
• Attenuated filter-bypass injector port (for timesync)
• SPI boot PROM: USB boot, SPI boot, or SPI boot with USB fallback

Core devices

Function	Part
ADC	LTC2208 (16-bit)
Clock generator	Si5351
USB3 controller	EZ-USB FX3 (CYUSB301x)
SPI boot flash	MX25L3233F

Pages

• Reference Documents — device datasheets and RX888 reference material.
• Contributing — how we collaborate: workflow, branches, and the design "baton".

Source

The KiCad design lives in the main repository.