[HCDX]: Strange sound on 1630 Khz?

["Gary J. Wilt" <stormwarn@xxxxxxxxxxxxxxxx>]

Last night from 0230-0345 UTC I heard a low rumbling sound on 1630,
no audio, just this strange sound. Signal was strongest from the
W according to my loop. Any ideas anyone?

Thanks,
Gary Wilt
Wood Ridge, NJ
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