Part 5 Of A Digital VFO For The G6LBQ Irwell HF Transceiver

For part 1 of the Digital VFO click here.

For part 2 of the Digital VFO click here.

For part 3 of the Digital VFO click here.

For part 4 of the Digital VFO click here.

Digital VFO I/O Expander Module

"For The G6LBQ Irwell HF Transceiver"

Welcome to part 5 of my blog post series covering the Digital VFO developed for use with my “Irwell HF Transceiver project”.

In this concluding article I present the I/O expander module which interfaces to the STM32 micro-controllers I2C bus, it's job is to extends the number of digital outputs available and provide switched logic outputs to drive my BPF and LPF transceiver modules.

Illustration of the I/O expander

 

 

 

Band Pass Filtering For The G6LBQ Irwell HF Transceiver Part 3

 For part 1 of the BPF module click here.

For part 2 of the BPF module click here.

HF Transceiver - Band Pass Filter Module

"High Performance RF Band Pass Filtering For The G6LBQ Irwell HF Transceiver"

In this blog post I conclude the development of my high performance RF Band Pass Filter suitable for the Irwell HF Transceiver as well as SDR receivers and other transceiver builds.