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Before the time of change I had a difference of about 0.1 dB in favour of TP-1. Now I'm measuring a difference of about 0.7 dB also in favour of TP1.
I can only account numbers reliably as from April last, because then the dish had to be realigned after the storm earlier in the year.
If I take the max SNR levels as reference: April was TP1= 15.5 and TP2= 15.4 dB. Current situation TP1=15.9 and TP2= 15.2 dB (these numbers are taken from the link margin graph plus 9.3 dB).
Of course you are in a more marginal region of the satellite's footprint, but as my TP1 went up considerably (at the expense of TP2) it is strange that yours went down instead. I can't explain it but it looks as if the focus of the footprint has changed a bit?