[linux-dvb] Re: FE SIGNAL AND SIGNAL STRENGTH

[Holger Waechtler <holger@convergence.de>]

Antonio Mosquera Quindimil wrote:
> I have a WinTv Hauppauge card under RedHat 7.3. I have
> installed it in Windows where I can watch TV without
> problems.Now, I have installed it in Linux.
> I have run some simple code about the frontend and it
> seems to be ok.
> But my problems are that when I have to check if the
> frontend has signal(first example of API), sometimes
> it says that it has signal, but sometimes it says FE
> HAS NO SIGNAL??. 
> I have also tried to set a section filter and read
> some data, but the length of the reading is -1( I
> can't read anything)??.Could you give me an idea of
> the problem??
> Which is a normal value for the signal strength when
> you use FE_READ_SIGNAL_STRENGTH??
Take a look on szap.c/czap.c/tzap.c in DVB/apps/szap/. These example 
aplpications are a good starting point to write your own zapping 
application.

Good SNR and signal strength values are in the range of 55-90% of the 
max. value 65536 (== 0xffff)

Holger



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