Noob here, trying to figure out what I heard this morning. As ISS passed over, on the FM voice downlink, I heard repeating tones that sounded kinda like "dadadee dadadee dadadee dadadee..."

Is that coming from ISS? Is it something from another ham on Earth that ISS was repeating? At the apex of the pass, it was strong enough to break squelch (Baofeng HT with handheld Yagi-Uda)...

Sorry for the noob question. Just trying to figure this stuff out in my very limited free time...

73,
Jeff, W5JEF