Category: Geeky Stuff

Building a Direct Conversion Receiver: Part 4

We last left off with having built the Diode Ring Mixer portion of the DC40 direct conversion receiver that we started on in Part 1. As was discussed, the Diode Ring Mixer accepts input from two sources: The antenna (through a Band Pass Filter) and the VFO. Now it’s time to examine these two critical …

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Building a Direct Conversion Receiver: Part 3

In the first installment, we talked about choosing a Direct Conversion receiver design to build and getting started with the most basic parts. Part 2 dove into Manhattan construction and building the amplification stages. For this third installment, we’re going to discuss the functions of the Diode Ring Mixer, Band Pass Filter, and VFO stages. …

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Building QRP Labs Band Pass Filters: 3 Tips you should know!

QRP Labs Band Pass Filters are these wonderful little kits that largely take all the question of building a filter. They use a proven design, the kit includes the inductors and wires, and the build instructions are top notch.  One thing I love about the QRP Labs Band Pass (and Low Pass) filter kits is that …

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Building a Direct Conversion Receiver: Part 2

In the first installment of this series, we discussed why we’re building a Direct Conversion receiver and talked about some basic ideas. In this installment, we explore what it takes to make the leap from a printed schematic to something physical that works. Follow along! Schematic Semantics The DC40 was originally designed by Ashhar Farhan …

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Building a Direct Conversion Receiver: Part 1

QRP Labs VFO, bare PCB with just the audio amplifier stage and a power strip to the left side of the board.

In this series of posts I’m going to take you on a journey. We’re going to explore the Direct Conversion receiver together, and I’m going to show you every bit of the journey that I can. Let’s get started! Why build a Direct Conversion receiver? When I restarted in ham radio in December 2016, it …

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