Sounder files suddenly became 666 bytes long after the 18:54 UT
sounding on 9 April 2010. Also some files just before midnight
on that day had the date label 10 April 2010 !
Rebooting the DOS PC did not change this.

10 April 2010
-------------
21:10 UT switched of sounder PC remotely (via sentry) since there
are zero amplitudes recorded on all antennas since 18:54 UT
on 9 April. There must be some major hardware problem with the receiving
system.