1970–1980[]
Logo with wordmark 
Japanese wordmark
Circle variant
QSL card (1977)
1980–2000[]
Japanese wordmark 
2000–present (corporate)[]
Variant with the wordmark
Japanese wordmark
2000–2019[]
Variant with the Station's Mascot Utty
2019, 2024–present[]
English wordmark
2020–2023[]
Logo with mascot
Horizontal variant