0x9900


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

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 …


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 entry-level radio. The ID-4100 has the same features as the ID-5100, with a smaller screen and only one VFO. Clear display …


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 a camera to take beautiful pictures of Earth. The tracking device is used to follow the airship on a map but also to retrieve the payload. Ham radio …


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 power connector. This board is suitable to turn any 7Ah, 9Ah SLA or Lithium battery into a convenient power source for indoor or portable operation. For …


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 using modes such as Olivia, Contestia, Domino, PSK31, etc. To make these contacts I use a software called Fldigi. I think I have made at least one …


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. You can find the complete list of cross mode capabilities on your Pi-Star configuration page.


Field Day 2019

Since I got my ham radio license, I have participated in Field Day with the PAARA radio club in Palo Alto. PAARA is one of the area's large regional clubs. Their Field Day setup is one of the most impressive of the San Francisco Bay Area.


Page 5 / 11