There’s an odd signal coming in here during the evenings audible on 1640 khz, a series of “dashes” at approximately 72 per second. The signal is centered at 1639.7 khz and best heard on 1640 lower sideband when phasing out WKSH. Since the signal fades in and out, I assume that it’s some distance away from me. Here’s what it looks like on the waterfall display:
Here’s an audio clip tuned to 1640 khz AM mode:
The “dasher” first came to my attention the other night while receiving an UNID TIS station on 1640 relaying NOAA weather, though I have no idea if the two signals are related, but I thought it was interesting. I wonder if anyone else is hearing this and where this is originating from?