|Voice||Male and female, pre-recorded|
|Known counterpart stations|
The operating agency behind G20a is uncertain. G20a was a variant of G20 where a single group message without a header was transmitted.
|Piece of music, one of listed below||Achtung, Achtung||65049 65049||Ende, Ende|
|Single 5-figure paired group|
|Played for a few minutes||Repeated twice|
Various pieces of music were used. Partial list of them is given below.
- Schubert Serenade
- "Atlantis" by The Shadows
- "La Raspa" by Mariachi Arriba Juarez
- Bach's Toccata in D minor
- Brahms Waltz opus 39
- "We Get Ideas" by Louis Armstrong
- "Tango Tarragona"
- "Red Balloon" by The Dave Clark Five