Category: HamRadio

I just got my Tech License

This article was also posted on the San Mateo Radio Club monthly news letter. In California, the majority of new hams come from an EmComm1 group. In this article, I am not going to talk about EmComm. It is a vast subject and your EmComm group is better suited …


Ham Radio Jargon for beginner

If you are a new ham checking into a repeater or someone listening to the ham radio band with a scanner, you will discover a lot of the jargon. In the following table, you will find the most common lingo you will hear on the amateur band and, more specifically …


DMR D-Star cross-mode

In my last article, I wrote about working DMR+ using the DMRGateway module of your Pi-Star hotspot. In this article, I'm going to explain how to use the same DMRGateway module to talk to D-Star networks using your DMR radio. What is cross-mode? When you talk on digital radio, the …


DMR+ with Pi-Star

When it comes to DMR, especially in North America, people think of BrandMeister. There is another network of interconnected repeaters and talk-groups called DMR+. Pi-Star hotspot. DMR+ was the first network that developed tools to interconnect ETSI Tier 2 DMR repeaters. It started in Europe and has grown in popularity …


APRS Telemetry

I wrote a little python program to send my iGate telemetry through APRS. The metrics include the temperature of the Raspberry-Pi, the load average, the amount of free memory, and network traffic. Sending the iGate metrics through APRS allows me to use the graph tools offered by aprs.fi or …


Common mode current and chokes

Tech day in Sacramento This Friday, I was invited to Sacramento to give my presentation on common mode current, what it is, and how to block or prevent it using common mode chokes. Once a month, Jeff (AK6OK) and Craig (N6YUV) organize a meetup they call ham tech day. A …


Measuring Toroid Attenuation

I needed to remove some RF noise from an air filter in the next room. When the fan turns on, the background noise raises my radio S meter by 2 S units. Like most of you, I tend to collect ferrite cores from random places. Unfortunately, the ferrite cores I …


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