A 40 - 10 meter QMX
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
A 40 - 10 meter QMX
LCD Display for the KD1JV TriBander
Making the KD1JV Tri-Bander More SOTA Friendly
QRP Tube: High Voltage DC to DC Supply Evaluation
QRP Tube: T/R Switch and QCX Interface and Modification
QRP Tube: Single Tube SOTA Transmitter
QRP Tube: Vacuum Tube, Battery, Lightweight, Compact, Portable: Can They Coexist?
All Wound Up About EFHW Transformer Winding
Evaluating efficiency, transformer and mismatch losses in toroid transformers - some observations.
Reactive Component Measurement With the NanoVNA
Toroid Transformers - How Hot Will It Get?
Leg Benchmark W7Y/EW-017 Activation - An Alternative Route From the West
Don't Fear the Smith Chart