Under what conditions is an amateur station authorized to transmit music using a phone emission?
When incidental to an authorized retransmission of manned spacecraft communications✓Правильный ответ
When the music produces no spurious emissions
When transmissions are limited to less than three minutes per hour
When the music is transmitted above 1280 MHz
Объяснение
Music by phone emission is prohibited except where the rules provide otherwise, and the one case that applies here is music that happens to be part of an authorized retransmission of manned spacecraft communications. Clean emissions, short duration or high frequency do not make music permissible.