HF Underground was reporting that Dave Valko heard a station on 9025 kHz that was playing a repeating clip of a Calvin Coolidge speech. On Sunday, the station was logged by a number of listeners on 9025 with the same clip repeating.
The last time that I heard something like this, it was the Aggressive Policeman station, which played the short audio clip for hours.
These types of stations tend to disappear quickly & no one logged Coolidge in the past two days, so I thought I missed it. I remembered to turn on the radio this morning before work & I let the recorder run. Just checked the recording. Around 1300, the Coolidge clips started to come through & lasted for about an hour before fading out. The mast of my inverted V got taken out in the first Nor'easter this month, so I'm sure it's not working optimally. Signal was fair at best.
I assume that whoever identified this station must have typed in some phrases that matched up the correct speech. Or maybe someone's a huge Calvin Coolidge fan and has been listening to his old speeches in the car when commuting.
Skipmuck posted a link to what he believes is the exact audio source used for the file. I didn't hear it well enough to verify if this is it but it could well be.
Lots of people have speculated about these types of stations, going back to at least the Yosemite Sam station from 2004 and 2005. But the databurst and use of multiple frequencies in DSB were tip offs that this was a military operation of some sort. Aggressive Policeman & Calvin Coolidge seem less like military stations, but they could well be.
The great thing is that they're all complete mysteries with odd, random "programming."