[linux-dvb] Re: how to determine signal strength under linux ?

[Johannes Stezenbach <js@convergence.de>]

Adi Pop wrote:
> 
> >From: "Martin Hoffmann" <ma.hoff@t-online.de>
> >is there a way to determine the signal strength of the broadcast ?

> Here you have an app. called sdb - maybe it helps (I didn't try it myself)
> http://www.panteltje.demon.nl/satellite/
> Unfortunately I think that it's working just with the old driver (version <=0.8)  :-(

The attached piece of code does it with the new API.

However, the VES1893 data sheet says "NEST[7:0] is the current value
of the noise power estimation. It gives an estimation of signal quality
and can be useful to point a dish."

So you might want to use the FE_READ_SNR ioctl instead of
FE_READ_SIGNAL_STRENGTH. Or both.
The scaling factors in my code are derived from Jan Pantelje'sdb, but
one day the driver might adhere to the docs and give us the
correct values directly...
http://www.linuxtv.org/developer/dvb_api/frontend.xml


Regards,
Johannes

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