RF / SwitchingIn progress
01
Manual antenna switching
A completely physical one-radio, three-antenna switch covering HF through 2 meters.
Project file →Field-built / Bench-tested
K4DIA
Practical radio projects, small applications, and notes from the workbench to the field.
From the bench
Current projects
Useful builds documented plainly: the idea, the tradeoffs, the parts, and what actually worked.
Field / GroundConcept
02
Rapid-deploy radial system
A compact counterpoise designed to deploy and pack up quickly enough to get used every time.
Project file →Portable / StationNotes
03
Field station planning
Portable layouts, antenna choices, cable management, and lessons carried forward from each setup.
Read notes →Built for operators
Small tools.
Useful answers.
Lightweight applications for radio work, written to be understandable, downloadable, and useful offline.
Python utilities
Calculators, planners, and bench helpers.
Reference sheets
Printable field references and checklists.
Source code
Public code with installation notes and change history.
Take it with you
Downloads
What survived contact with reality
Field notes
Short write-ups on installations, portable operations, component choices, test results, failures, and the fixes worth remembering.
Read the notebook →