Portable 40m Direct-conversion Transceiver Design
Having finished my master’s degree over a year ago now, I’ve started to see my thesis show up on various academic web sites. I decided I should probably link it
200 kHz Arduino Clock Generator
Someone contacted me recently about using an ATMega328 to generate a 200 kHz clock signal for a BBD analog delay chip. I finally had a few minutes today to sit
Amongst Projects: Therematron
Here’s an beautiful synth project I found by Steve Roberts at Amongst Projects that utilizes some work I did back in 2012 with my Arduino LFO. It’s always a pleasure
7MHz Transmitter with AVR Soft-keyer
In my last post, I went over the design of a Colpitts crystal oscillator design that put out a moderately clean 7 MHz signal. In order to match the output
7MHz Crystal Oscillator Design
After constructing a 40m wire dipole that works with my SDR setup, I needed to start working on a transmission system. At the heart of virtually any RF system lies
Testing a 40m Wire Dipole on Mt. Hood
Here’s a quick video showing how I deployed a DIY 40m dipole antenna on Mt. Hood a while back. Though not the most interesting video, I think it shows the
2m AM Exciter
Here’s a project that I’ve been working on for a class recently. This is a very basic 2m AM Transmitter that operates from 144.25 to 144.31 MHz. It does put
Basic Voltage-Controlled Amplifier
I’ve been looking at the theoretical principles that govern the voltage-controlled amplifier (VCA) recently and came across some simple VCA designs that caught my attention. A common technique involves a
The Cicada: a push-pull vacuum tube amplifier build
Well, 2017 is more than half over now. This means I should probably post something to get at least one post in for this year. I’ve been meaning to do