World QSL CollectionProtected viewerOpen station · signal intelligence · living archive
Connecting stories.Automating signals.
OA4EFZ brings together real operation, open knowledge, signal technology and radio memory from Peru to the world.
SYNCCountries
SYNCLive spots
OA4EFZLima · Peru
FEATURE 001
Featured Story
The beginning of a signal
La historia de OA4EFZ, contada desde la estación.
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Knowledge center
Global amateur-radio glossary
Clear definitions, operating examples and technical context in English, Spanish and Portuguese.
Global signal intelligence
Live world radio map
Activity, spots, prefixes and estimated paths from your location or from OA4EFZ.
Signal applications
OA4EFZ ecosystem
Independent tools to learn, practice, create, measure and operate better.
◉RadioDeckOperational intelligenceOpen tool →
⌁CW LabMorse code trainingOpen tool →
APhonetic LabInteractive phoneticsOpen tool →
▣SSTV StudioImage encoding and optimizationOpen tool →
◇QSL CreatorDesign and trace QSLsOpen tool →
⌇Signal LabTone and signal analysisOpen tool →
⌨Contest KeyerContest macros and keyingOpen tool →
◈Satellite CoachSatellite pass trainingOpen tool →
Living archive
QSL, memory and traceability
Verified contacts, radio objects, stories and documents preserved as a living heritage.
World QSL CollectionProtected viewer
Public activity
OA4EFZ in real time
Reels, posts, tests and records shared from the station.