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

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

Dan Koellen AI6XG

Jun 27, 20248 min read

1,795 views

1 comment

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

Dan Koellen AI6XG

May 9, 20249 min read

294 views

1 comment

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

Dan Koellen AI6XG

Jul 18, 202311 min read

823 views

0 comments

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

Dan Koellen AI6XG

May 2, 20236 min read

439 views

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A Modified QCX and TR Switch for Vacuum Tube SOTA transmitter

Dan Koellen AI6XG

May 2, 20236 min read

372 views

0 comments

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

Dan Koellen AI6XG

May 2, 202316 min read

570 views

0 comments