Update 11.7.22: The portable Mk2 build page is about done: The V2 Portable Build

Update 28.6.22: Portable build based on the Mk2 design is now about done (besides making a plastic mask to go inside the box lid to hide the Disco board). I have identified the cause of the buzz that can be heard when the tuning knob is turned quickly - this comes from the TUN_CH1 line and is some appalling PCB routing on my part. This can be solved with a simple cut and strap on the underside of the radio PCB - see the portable build page (work in progress) for details.

Update 17.6.22: Now that pressures at work have dropped from insane to high, I have begun a last push to get my Mk2 receiver assembled into the Hammond RP1175C box, something that I started more than a year ago!! I will shortly be adding a sub page for this with some pictures and assembly notes.

Older updates

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.

Kits comprising the majority of the parts required to build the radio PCB are available. However, given the degree to which global component shortages is ongoing, I suggest you begin by emailing me for a BOM listing (moc.dlrowltn@321ylbmit (reversed) or via qrz.com) so that you can make sure you can get hold of (or already have) the non-kitted parts needed to complete the receiver.