For the past few weeks many 144MHz meteor scatter enthusiasts have been complaining of interference from AFSK packet transmissions. As a 144MHz DX
enthusiast, in addition to being VHF manager I took an interest and started monitoring.
The transmissions on 144.390MHz FM AFSK occur at regular intervals, mostly on Northerly headings from my location near Saxmundham in Suffolk. The
transmissions fill about 15KHz of spectrum on the waterfall display of my SDR receiver.
The impact the satellite signals on narrowband MS users can be seen from this video from GM4JJJ
Because of the inclined orbit Northern European amateurs get a longer pass than those in the US which means that there is a burst every minute for a
pass lasting up to about 12 minutes, repeating every 110 minutes orbit time. Whilst that is not continuous QRM one pass is enough to cause a meteor
scatter QSO on 144.390 +/- 6KHz to fail if they coincide.