A search of the days activity indicated that by chance , it had been mlatted a couple of times and checking the location
placed it within the Aberporth range . The SSR in use was 4542 , a range code.
The days log showed the a/c active from sea level to 10,000 feet but suggested it had loitered at the upper level for some time.
At one point there was also a Valley Hawk close by.
All this coincided with NOTAM info which confirmed UAV / jamming trials.
This turned out to be the first logging of a Watchkeeper UAV , using a bogus hex.
Its thought that the UAV was sending Mode-S as part of the jamming trials
