[linux-dvb] Re: How to determine the frequency of a channel

[Carsten Koch <Carsten.Koch@icem.de>]

Martin Neuditschko wrote:
...
> But the result is not which I wanted because the "FE_HAS_LOCK"
> appears very often but there is no audio or video.
> 
> Here a small example:
> Frequency: 377758000
> status 00 | signal 9090 | snr d6d6 | ber 00012eec | unc 0000007f |
> status 1f | signal ffff | snr eded | ber 00012eec | unc 0000007f | FE_HAS_LOCK
> status 1f | signal ffff | snr ecec | ber 0002c3d8 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal ffff | snr eded | ber 0002c3d8 | unc 00000003 | FE_HAS_LOCK
> status 1f | signal ffff | snr ebeb | ber 00013335 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal ffff | snr ecec | ber 00013451 | unc 00000002 | FE_HAS_LOCK
> status 1f | signal ffff | snr eded | ber 00013451 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal ffff | snr ecec | ber 00013057 | unc 00000000 | FE_HAS_LOCK
> status 1f | signal ffff | snr ecec | ber 00013057 | unc 00000004 | FE_HAS_LOCK
> status 1f | signal ffff | snr eeee | ber 00012f50 | unc 00000002 | FE_HAS_LOCK
> status 1f | signal ffff | snr ebeb | ber 0001316d | unc 00000001 | FE_HAS_LOCK
> status 1f | signal ffff | snr ecec | ber 0001316d | unc 00000001 | FE_HAS_LOCK
> status 1f | signal ffff | snr ecec | ber 0001345f | unc 00000000 | FE_HAS_LOCK
> status 1f | signal ffff | snr ecec | ber 0001345f | unc 00000001 | FE_HAS_LOCK
> status 1f | signal ffff | snr ecec | ber 0001318e | unc 00000000 | FE_HAS_LOCK
> status 1f | signal ffff | snr ebeb | ber 0001332a | unc 00000000 | FE_HAS_LOCK
> 
> How else could I try to determine the best frequency?
> Has someone an idea?

I'd say go for the one with the strongest signal an the
best signal to noise ratio. But apparently the signal 
strength indicator is at maximum already and the snr
does not vary much. I wonder if that can be improved in
the driver, so you get useful values?

Carsten.


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