problems receiving RTL4 and RTL5

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i have a nokia 9302 rceiver and i can´t seem to tune in RTL 4 and 5 i don´t think its the dish and lnb as i have tried another receiver and all the channels come in and i have tried my receiver on another dish setup, what could be the problem, i live in the south of spain, and the size of dish is 85cm.