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 to learn about my IOT garden and photography. You may also visit my QRZ.com page for my Ham Radio profile.

Interested in learning more about Me?

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

Dan Koellen AI6XG

Jun 27, 20248 min read

The QMX from QRP Labs is modified for operation from 40 to 10 meters. A perfect SOTA rig when matched to a 40 meter EFHW

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Dan Koellen AI6XG

May 9, 20249 min read

In an earlier post I described the modifications I made to the KD1JV designed TriBander to make it more useful for SOTA. The...

293 views

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Dan Koellen AI6XG

Jul 18, 202311 min read

This post outlines the modifications made to reduce receive current consumption, reduce weight and size, and change the controls and readout

819 views

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Dan Koellen AI6XG

May 2, 20236 min read

The high voltage supply for the vacuum tube transmitter needs to be low noise in the 40 meter band, efficient for battery operation and...

432 views

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Dan Koellen AI6XG

May 2, 20236 min read

A Modified QCX and TR Switch for Vacuum Tube SOTA transmitter

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Dan Koellen AI6XG

May 2, 202316 min read

A single tube transmitter is developed for portable and Summits on the Air (SOTA) use. The SOTA transmitter had to be relatively...

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