Well, in accordance with my last tests (today went to the field and the tracker failed completely
) the problem was the 2nd batch of LM1881 chips I bought, they are unstable and change the bits from the right line to one or two lines above or below the pretended line.
Of course, the arduino Rx can not find any bits in the line it seeks for...
Tomorrow will try again in the rc field, but this time with the lm1881 chips from the batch#1.
Dennis, this could also explain why there are so many problems with the lm1881 version of opendiyosd.
I did change the Rset of the N(ational) Lm1881 without any good results.