Dan Koellen AI6XGJul 18, 202311 minMaking the KD1JV Tri-Bander More SOTA FriendlyThis post outlines the modifications made to reduce receive current consumption, reduce weight and size, and change the controls and readout
Dan Koellen AI6XGMay 2, 20236 minQRP Tube: High Voltage DC to DC Supply EvaluationThe 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 AI6XGMay 2, 20236 minQRP Tube: T/R Switch and QCX Interface and ModificationA Modified QCX and TR Switch for Vacuum Tube SOTA transmitter
Dan Koellen AI6XGMay 2, 202315 minQRP Tube: Single Tube SOTA TransmitterA single tube transmitter is developed for portable and Summits on the Air (SOTA) use. The SOTA transmitter had to be relatively...