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Message: <blockquote data-quote="s-band" data-source="post: 1113201" data-attributes="member: 407744">Something strange is being done to the beacon. It was down to <15dB in 10Hz and the polarisation has been changing. For a while I couldn't get a null at all, suggesting circular. Now the level's up and it has a 15dB null but seems to be slightly off vertical. I'd expect at least 25-30dB nulls on this set-up.In the time it took to write the above it's returned to 35dB in 10Hz and the full null is back. The skew seems to be all over the place.edit: few mins later back to poor null and lower levelEdit 2: I see the wide band noise as in [USER=175005]@John[/USER] plot 13.56-13.64V</blockquote>