I tested some PWM values for my Siemens DVB-C card. The old value was 0x12, which gave me ves1820: AFC (9) -60645Hz I changend PWM to 0x0c and the result was ves1820: AFC (0) 0Hz But when I checked the BER, I found out that on higher frequencies the BER value was higher than with the old PWM. On 426 MHz I always had a BER of 550-650. With the "optimized" (?) PWM I now have about 850. But why? And what should I do? What is better: a low BER or a low AFC value ?