Looking over Donner Lake

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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.

Dan Koellen AI6XG

Oct 4
8 min

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

Jun 29
7 min

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

Jun 6
4 min

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) ...

796 views 1 comment

Dan Koellen AI6XG

May 27
3 min

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...

885 views 1 comment

Dan Koellen AI6XG

Apr 5
3 min

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

Feb 9
9 min

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

Jan 12
3 min

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

Jan 12
4 min

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

Jan 11
2 min

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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Dan Koellen AI6XG

Jan 11
2 min

Signal Hill (7751) W6/NS-393 Activation

Looking east from Signal Hill, Donner Lake is in the background and Lake Angela in the foreground Summit Trip Summary Distance: ~ 2 mi on...

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