Category: QRP

Backpack SDR: A modular QRP SDR Transceiver

Today I wanted to post about a new SDR project called “Backpack SDR” that’s taking shape. Since August, Keith Myles, VE3IFT has been sharing pictures of his Backpack SDR transceiver project on the Amateur QRP Radio group on Facebook: What is the Backpack SDR? The Backpack SDR is an HF transceiver project that is based …

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The QCX Mini: A truly Miniature QRP CW Transceiver

In May 2020 the QCX was killed off in favor of the larger, easier to assemble QCX+, and as a result, Hans over at QRP Labs found himself in a bit of a quandry! A lot of people loved the new radio, but a surprisingly large contingent of hams said “It’s too big!” Their primary …

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uSDX (SSB with a QCX) Update

Earlier this year I wrote about a modification/hack to the the QRP Labs QCX called uSDX that turns a normal CW only QCX into a SSB capable radio. It uses the Atmega 328p chip as an SDR, and uses a high end technology call EER to modulate SSB out of an amplifier made for CW. …

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BITX40 Rebuild Part 1: Mistakes, Planning and Teardown

Things have been pretty busy around MiscDotGeek, and we’ve barely had time for Radio Related things. As I mentioned in the July 2020 update, my BITX40 quit transmitting while sitting stationary on my desk, dutifully doing its job as a JS8 radio, it quit transmitting. I put the uSDX in its place, only to have …

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Experimental Methods in RF Design is on Clearance

Hey everyone, just a short post to let you know that Experimental Methods in RF Design (EMFRD) is now on clearance at the ARRL’s store for just $20. This is an incredible deal for anybody who’s the least bit interested in Amateur Radio home brewing. Where to get EMFRD You can get it right now …

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QRP Labs HQ Tour and QCX Mini!

Just a quick post today to point you in the direction of an exciting announcement from Hans Summers over at QRP Labs. When he discontinued the QCX in favor of the QCX+, there was a strong contingent of hams who cried out in unison: “It’s too big!” and expressed that they wanted a small version …

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SSB and Digital with… a QCX?

In January 2019, a ham named Guido, PE1NNZ posted to the QRP Labs groups.io group. The title of the post was “QCX-SSB: SSB with your QCX transceiver“.If you’re familiar with the QCX, then you’ll realize that this is a profound statement! The QCX is a high performance 5w CW transceiver. So how on earth did …

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Goodbye QCX, Hello QCX+!

Today in the QRP Labs Groups.io group, Hans Summers announced an updated replacement for the QCX, which he’s calling the QCX+. It’ll be $6 more than the old QCX, but there’s some wonderful improvements. It’s designed specifically to fit a case a lot more easily, and the PCB itself is 2.2x bigger than before, which …

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Salvaging old CB’s for QRP Parts: Part 4

In the previous three installments, we tore down two old CB’s and an even older tube based CB linear amplifier. Those teardowns were a lot of fun and a great way to look at the way things used to be done before frequency synthesis took over. In this final CB teardown, we’re going to look …

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Easy Bitx: More details, Tentative Pricing and Release Date

Update 5/11/2020: Article updated to reflect correct information regarding band availability Ever since HF Signals discontinued the BITX40, there’s been a gap in the available SSB QRP kits out there. Sure, there’s the uBITX, but that’s more complicated multi-band radio. For a beginner, a single band radio is easier to build and understand. Thankfully, the …

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