Update 17.9.21: I have ordered a bunch of Si5351A's from AliExpress. Hopefully these will be genuine SiLabs/Skyworks parts, as I have read on furums about people having problems with low-quality Chinese parts having high jitter / dropping out of lock. There is also the 'official' Chinese copy, the MS5351M; by all accounts these appear to work as expected. If the AliExpress parts are bad I will try these next!

Update 19.8.21: Don't worry, this project is not dead! I am maxed-out at work currently, plus there are increasing problems with component availablility. Currently I have ~5 kits available to ship without the Si5351A-B-GT.

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Mk 2 Home-Brew HF SDR Receiver by Tim Howe, G0ETP

A complete, multi-mode HF + 6m SDR receiver as an easy, plug-on 'shield' for the STM32F429I Discovery Board

G0ETP V2 SDR Board connected to STM32F429I-DISC1 Discovery

Key Features compared to the V1.2 Receiver

  • Plug-on 'shield' for the STM32F429I Discovery board
  • Single board design with everything required to make a receiver, including the memory backup battery and audio amplifier
  • The software is branched from the V1.2 design and therefore the look & feel, plus all all functions are pretty much identical
  • Provision has been made for the direct connection of an HA8LFK bandpass filter board
  • Pin mapping of the ARM device has been completely redone. There is now access to 2 serial ports (UARTS)
  • Full CAT control via one of the UART interfaces has been implemented (being 'beta-tested')
  • As a result of the new pin mapping, new features (including CAT) will eventually be available for builds based on the V1.2 PCB, however this will require various signal to be re-wired.
  • This project still requires soldering of 0603-size SMD components and a couple of fine-pitched ICs. It now includes a QFN-20 RF IC which is not too difficult with the correct soldering technique.

    Notes/advice on QFN soldering.

    Limited numbers of kits are available now, however, global component shortages mean that these kits do not include the Si5351A.

    Screen-Dumps Illustrating the User Interface

    G0ETP V2 SDR - 40m CW G0ETP V2 SDR - 60m SSB G0ETP V2 SDR - 20m PSK31 decoding G0ETP V2 SDR - ARRL CW Contest 21-2-2021 12:05UTC

    Additional Pictures of the Assembly

    V2 Receiver PCB - Component Side View: G0ETP V2 SDR Board - Top View V2 Receiver PCB - Underside View showing connectors that mate with the STM32 board: G0ETP V2 SDR Board - Bottom View V2 Receiver board attached to the STM32 Discovery: G0ETP V2 SDR Assembly - Edge View Early picture of V2 Receiver in operation: G0ETP STM32 HF SDR Rx V2 working for the first time

    The PCB can be seen here

    Now with the 7-band preselector filter fitted:

    G0ETP STM32 HF SDR Rx V2 assembly with HA8LFK filter board

    Video clips

    Video 1: Sample of 80m SSB, 26.2.2021

    Video 2: Tuning around 20m SSB + using the notch filters, 7.3.2021

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    Last updated: 17.9.2021