Blue Hound (sound like) clg Sky Launch (?) for radio check.
Your search for 258.450 returned the following results.
Tags: APAC
258.450: Hill Climber 778 calling Hammerhead Main for satcom check.
Tags: APAC
258.450 PAC: Warfighter 76 requesting comms check in the clear.
Tags: APAC
Logged an unknown station on 258.450 calling what sounded like Anti X-ray for a radio check.
Tags: APAC
258.450 King 602 calling any station via the Pacific Ocean sat for a radio check.
Tags: APAC
258.450 PAC: Sunking 603 in comms w/ Sunking 602 for radio checks in the clear.
Tags: APAC
Male voice passing message with NATO style phonetics on 258.450. Unknown data blips covering them and making for tough copy.
Tags: APAC
Unidentified station doing some testing on 258.450 from the PAC region.
Tags: CONUS