back in the late 80's and early 90's I'd heard this on the HF sats that downlinked on 10M, but not on 2M.
While looking at future satellite plots I had the receiver tuned to the mid band of the AO7 downlink and I'm hearing CW (145.948 MHz). There are no amateur satellites above my horizon, anywhere. It was very clear, sounded like someone listening for their output, long dashes, bursts of CW, pauses, more of the same. I thought that I'd recorded it, but I didn't press the record button long enough and have nothing to show for it. GPredict, at about 21:12 UTC had the azimuth of AO7 at 327 deg with an elevation of -54. It lasted a few minutes and the followed the Doppler correction as shown on GPredict. When I pointed my antenna to the GPredict azimuth for AO7 the signal strength noticeably increased.
Does this also happen on 2M?
Ron VE8RT