1240 S9+20 alarm siren recording, 20 sec cycles, played in a loop
https://voca.ro/1cvWZZK6pHwy 1308 "tennis rocket" sound
-I remember this channel as RU Mil - are they warning about some combat action from Ukraine?
Their other "beacon" channels emit a typical digital hum, except 6828 (S7) that played in the
loop song Katjusha, up to 1303.