PhaseLoom v1.0 (Hand fixed, assembled)

Bring the magic of Software Defined Radio to your retro-inspired projects with the PhaseLoom SDR Shield – a quadrature sampling detector SDR frontend designed to work with the 6502-based 65uino (and any microcontroller with I²C support).

This assembled board gives you a head start on experimenting with SDR, IQ sampling, and radio-frequency design — all without the hassle of soldering fine-pitch components.

⚠️ Note: Pin headers are not mounted or included, giving you flexibility to choose the orientation and connector style that fits your project. Also, this is not a standalone project, you need an Uno-style microcontroller like the 6502-based 65uino (software available) or write your own software.

Features

• Quadrature Sampling Detector Frontend
  Tayloe-style commutating mixer with improved noise immunity and differential signal handling.

• SI5351 Clock Generator
  3-channel programmable oscillator with 90° phase offset capability. Controlled via I²C.

• HF Coverage
  Works from audio frequencies up to ~150 MHz (depending on filtering). Great for experimenting with ham bands, shortwave listening, and SDR fundamentals.

• 65uino Compatible
  Designed as an Arduino-style shield for the 6502-based 65uino, but also works with Arduino, ESP32, STM32, and other I²C-capable hosts.

• Open Hardware
  Schematics, firmware, and support resources are freely available — build on it, hack it, or extend it.

What’s Included

• 1 × PhaseLoom SDR Shield (fully assembled SMT parts)

• Gold-plated copper RF traces

• 6 x Mounted SMA connectors

• Preloaded SI5351 ready to be configured via I²C

What’s NOT Included

• Pin headers (mount your own straight, angled, or stacking headers as needed)

• Antenna, bandpass filters, or ADC — you’ll want these for real-world reception

• 65uino or other host board

Perfect For

• Retro computing fans who want to push the 6502 into modern RF territory

• Amateur radio experimenters looking for a compact SDR frontend

• Electronics hobbyists who want a ready-made platform for exploring IQ sampling, aliasing, and GNURadio

Notes

• This is a prototype development board — performance may vary, and experimentation is encouraged!

• All boards sold have been hand-corrected for early-phase pinout errors.

• Open-source hardware files and firmware are on GitHub.

📻 The PhaseLoom makes it possible to hear the airwaves with 1970s silicon at the core. Grab yours today and start exploring the spectrum!

Source code, software and instructions are on Github: https://github.com/AndersBNielsen/PhaseLoom

Video

The video that introduced PhaseLoom — how the SDR frontend works, from IQ sampling and the mixer circuit through to receiving real HF signals with it.