Category: DIY

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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QRP L-Match Tuner Build

In this post we’re going to build an L-Match tuner for your QRP wire antenna. But you might ask: Why do I need a box between a bit of wire and my transmitter? That’s a good question! Amateur radios are constructed in such a way that they have an impedance of 50 ohms. For portable use …

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9800 Miles on 200mw with WSPR

Yes, you read the title right- 9800 miles (15772km) on 200mw of power using WSPR. Read on to find out how this was done, and why it was even possible to begin with. Equipment used The equipment is simple. At the top is my QRP Labs U3S as shown in a previous post, the Bread …

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The QRP Labs U3S WSPR Beacon

In September of 2017 I built a QRP Labs U3S and posted my initial review of it on This Blog.  That was over a year ago though, and since then a lot has changed. So lets catch up and re-review the U3S and talk about what it can do, and how you can get the …

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