Category: HamRadio

Measure a capacitor using an oscilloscope

In my last article, I showed how to measure an inductor using a known capacitor. This method could be used to measure a capacitor using a known inductor. This post will demonstrate a better and more accurate way to measure a capacitor using an oscilloscope. Usually, a capacitor's value is …


Measure an inductance or capacitance using an oscilloscope

Resistors, inductors, and capacitors are passive components used in every electronic circuit. Usually, the value is marked on the resistor or capacitor, either as a color code or a number. Often, inductors have no markings, especially those with a ferrite core or an air core. To measure their value, professionals …


How to power your radio

People think that all wires are the same and that any cable should be OK to power their rig. This is far from true, especially when you want to power your radio using a battery. This article focuses on installing a mobile radio or installing a battery backup for your …


Antenna modeling software

I gave a presentation on antenna modeling software to a couple of clubs in California and Oregon. From the physical antenna design to the matching network, we designed the antenna live with the participants. Here is a little more about the talk: During the first part of the talk, we …


Mini APRS Weather Station

A year ago, I installed a system based on a Raspberry Pi Zero to manage my backyard lights. Since the system is installed outside in a weatherproof box, I have decided to install a DS1820 temperature sensor, send the data to APRS1, and use the APRS infrastructure to monitor …


Digital Voice Presentation

Every Thursday, the Portland Amateur Radio Club (PARC) organizes a series of conferences called Beginning Ham Radio. These conferences aim to teach new hams all the aspects that ham radio has to offer. This week, the club invited me to talk about the latest and popular Digital Voice modes. The …


Learning CW

The Wordsworth method After watching George Allison's (K1IG) talk on QSO-Today describing his methodology to "head copy" Morse code, I have decided to give another shot to learning Morse code, often called CW in the ham radio word. According to George, high-speed operators who copy in their heads at speeds …


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