[linux-dvb] Writing DVB Software - couple questions

Johannes Stezenbach js at linuxtv.org
Wed Feb 23 01:32:50 CET 2005


Please do not top-post!

Andrew Hakman wrote:
> Hmm, ok. Does anyone know what the BER number means for the stv0299
> frontend? It seems to actually be doing something somewhat meaningful
> because it's always changing. It would be extremely good to at least
> get one meaningfull number out to help with dish alignment or
> adjusting, and from talking to people that use commercial equipment,
> the BER seems to be the most important figure (which makes sense to me
> as well).

The problem is that is only defined when the frontend is locked,
so for dish pointing it is unusable. The signal strength is more
usable for dish pointing.

BER for stv0299 currently gives an absolute number of bit errors
after viterbi decoding (that are corrected by the reed solomon decoder),
which is reset each time when the FE_READ_BER ioctl is called (about one
second for szap).

Johannes




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