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Fred's Blog about Ham Radio, Python, Unix and more...

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 ...

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 ...

D-Star with an Icom ID-4100

A couple of weeks ago I got a new D-Star mobile radio. The radio is an Icom ID-4100, VHF/UHV. According to Icom, this rig is a D-Star1 ...

High Altitude Weather Balloon.

A few months ago, I watched YouTube videos about ham radio operators launching high altitude balloons. They carry a tracking device and ...

Battery board with protection cut-off

A couple of months ago I designed a convenient Battery Monitor board with a voltmeter, one Andeson PowerPole connector as well as a USB ...

Logging on MacLoggerDX with FLDigi

One of my favorite activities on the radio is making contacts using digital modes. I'm not talking about FT8. I mean real conversations ...

YSF to DMR Cross mode on Pi-Star

The Pi-Star has the capability of working across digital modes. This means you can use a C4FM (YSF) radio to talk on DMR and vice-versa. ...


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