Microphone Pre-Amplifier For The Irwell HF Transceiver

Back in October 2022, I posted details on the blog of a "High Performance AM, CW & SSB Modulator for the G6LBQ Irwell HF Transceiver" this module was somewhat experimental and, for me, a practical introduction to the MC1496 modulator IC. The module contained no microphone amplifier stages, as it was my intention to add these as a separate module at a later date.

  To view my 2022 Modulator blog post article, click here.

In this blog post, I get to grips with the microphone preamplifier and share some of my design methods and thought processes along the way.  Note it is not my intention to provide a step-by-step guide to the design but more of an insight and reference.

The success of this module is crucial in order that I can continue the development of the final transmit stages and achieve finished project status.

A VHF & UHF RF Multicoupler.

Here at the G6LBQ ham shack, I have various receivers and radio scanners that I use for monitoring the VHF/UHF ham bands and other RF signals that interest me. In an ideal world, each receiver would have its own dedicated antenna but that is not practical for me so I have decided to design and build an RF Multicoupler.

The main application of an RF Multicoupler is to enable multiple receivers to share a common antenna and it does this by splitting the incoming signal into a number of output ports, as illustrated in the image below.