Looking over Donner Lake

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Interested in learning more about Me?

Ham Radio, Summits On The Air (SOTA), Making and Hacking and Vintage Electronics are hobbies that I enjoy. This website covers my activities in these hobbies. See my personal website for less technical activities. You may also visit my QRZ.com page for my Ham Radio profile.

Listen to the Hamdom Thoughts podcast by AD6DM interviewing me about Ham Radio, Making, Hacking and SOTA

Dan Koellen AI6XG

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Wishing You a Very Random Christmas

Being the holiday season I decided to post this article from the December 2014 issue of Nuts & Volts magazine www.nutsvolts.com that I wr...

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Dan Koellen AI6XG

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Trapped 20/30/40 Meter EFHW Antenna

An End Fed Half Wave (EFHW) antenna for operation on 20, 30 and 40 meters was built for SOTA operation. By using traps, the antenna work...

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Dan Koellen AI6XG

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Big Font Clock Update: Dimmer-Interface PCB and Setup Instructions.

A prior post described the development and build of a clock to display time and date for UTC and Local. The clock characters are large, ...

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Dan Koellen AI6XG

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End Fed Half Wave Antennas: More About the Primary Capacitor

I recently posted a blog claiming that a capacitor in the primary of the matching transformer is not needed for end fed half wave (EFHW) ...

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Dan Koellen AI6XG

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End Fed Half Wave Antennas: Is a Primary Capacitor Really Needed?

In my research on End Fed Half Wave (EFHW) antennas I found that nearly all have a capacitor in the primary (rig) side of the transformer...

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Dan Koellen AI6XG

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Auto Run for your Raspberry Pi - how to have your Rpi boot up in the desired configuration.

The Raspberry Pi (Rpi) is a great single board computer (SBC) that can be used in many projects and comes in different configurations. I...

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Dan Koellen AI6XG

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Big Font Clock - Relieve for Old Eyes

Recently the Maker Space that I frequent received a number of 4 line 40 character (4 x 40) LCD displays. They asked me to figure out how...

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Dan Koellen AI6XG

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Castle Peak W6/SN-038 Activation

Operating Position on Castle Peak Looking Southwest Summit Trip Summary Distance: ~ 3.5 mi one way Transport: Hiking Elevation Gain: 19...

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Dan Koellen AI6XG

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Sand Ridge W6/NS-155 Activation

Operating Position Looking South From Sand Ridge Summit Trip Summary Distance: ~ 6.5 mi one way Transport: Hiking Elevation Gain: 1200 ...

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Dan Koellen AI6XG

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Mount Lincoln W6/NS-149 Activation

Looking east from Mt. Lincoln, Tinker Knob W6/NS-121 is hiding behind Anderson Peak Summit Trip Summary Distance: ~ 3 mi one way Transpor...

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