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WSPR Transceiver — ELEC3607 Assignment 1

Group assignment modifying the WSPR-SDR platform to add a transmit path and redesigning the PCB as a full transceiver.

Overview

Part A — Software Transmitter
Drives the Si5351's CLK2 output to generate a WSPR-encoded signal, looped back to the receiver input at RF. A C program encodes callsign, Maidenhead locator, and power level into the WSPR protocol and controls CLK2 via I²C.

Part B — PCB Redesign
Modifies the WSPR-SDR KiCad layout to add a 0.1 W PA stage and GPIO-controlled T/R switch sharing the existing bandpass filter. Components from element14 AU. JLCPCB 2-layer spec.

Repository Structure

wspr-transceiver/
├── software/               # Part A — C transmitter
│   ├── wspr_transmit.c
│   ├── wspr_encode.c/h
│   └── Makefile
├── hardware/               # Part B — KiCad project
│   ├── bbb/
│       ├── bbb.kicad_pro     # Kicad project
│       ├── bbb.kicad_sch     # schematic
│       ├── bbb.kicad_pcb     # pcb layout
│       ├── Kicad_libs        # contains symbols and footprints of new components
│       ├── *.gbr             # Gerbers
│       ├── *.drl             # drill files
│       ├── *.net             # netlist
│       └── *.csv             # BOM
├── report/                 # IEEE-format PDF report
└── README.md

Part A — Build & Run

cd software && make
./wspr_transmit VK2AAX QF56 3
# args: <callsign> <grid_locator> <power_dBm>

Targets /dev/i2c-3, address 0x60 (Si5351). Fit loopback jumper before running.

Part B — KiCad

Open hardware/bbb/bbb.kicad_pro in KiCad 8.x. Upstream reference: phwl/elec3607-lab pcb_2026.

Hardware Target

• BeagleBone / PetaLinux
• Si5351: CLK0/CLK1 → Tayloe detector, CLK2 → TX
• I²C: /dev/i2c-3, 0x60

Team

University of Sydney — ELEC3607, Semester 1 2026.