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

Keeping your AllStar node cool

In a previous article I describe how I built a mobile Allstar node. I carry this node me with when I go to a meeting, or on a trip, leaving the node running in my car. California is a sunny state, and the inside of a car can get hot …


Going digital with the FT-70D

The FT-70D is a great little radio that I always recommend for new hams as well as for experienced hams who want to try digital voice. It is simple to use and well priced for the quality and performance you get.


Battery Monitor for QRP operations

I often use small 7 or 9 Ah lead acid batteries because they are convenient and inexpensive. For example my AllStar node at home is plugged to one of these batteries, which allows me to continue transmitting even when there is a power outage.


Clamp-on RF current probe

One of the useful tools a ham radio operator can easily and cheaply build is a clamp-on RF current probe. For example, this probe can help you check if you have common mode current on speaker wire or on a power cord. It can also help you find where the …


Mobile Allstar node

AllStar is a network of analog repeaters or nodes linked through the internet. It is based on a modified version of Asterisk, an open-source PBX software. Like for the telephone, numbers are assigned to users/node. This allows them to ‘dial-up’ other nodes and create temporary or permanent ‘conferences’. In …


DMR or C4FM Simplex Frequencies.

To work simplex with your DMR or C4FM radio please do not use the FM analog national call frequencies 2m (146.520 MHz) or 70cm (446.000 MHz). Do not use these frequencies for any digital work. Below are the recommended simplex frequencies to be used with DMR in the …


Parachute Mobile for AllStar users.

Parachute mobile is all about the fun of jumping off a perfectly working airplane and share our thrill with our ham friends. Parachute mobile is also about tinkering with electronics and experimentations. Over the years we went from simple VHF contacts to HF contacts, APRS, video, and digital communication. Our …


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