[linux-dvb] Re: Pinnacle PCTV Sat, locking problems

[Holger Waechtler <holger@convergence.de>]

Holger Spielmann wrote:
> Am Mo, den 01.12.2003 schrieb Holger Waechtler um 11:54:
>
> > You can use szap also for non-TV channels too, just set audio and video 
> > PID for your data transponder to 0 or 0x1fff. Since szap is much more 
> > verbose in case of troubles than dvbtune I'd suggest you to use this 
> > tool for debugging - as soon you have a reliable stream you can start to 
> > configure your network connection.
>
> After had a glance at szap.c I assume I understood the config file
> format. BTW, the szap I use comes from the Debian package dvb-utils,
> version 1.0.1-6
> I made the following line in channels.conf:
>
> T-DSLviaSat:10773:h:1:22000:0:0:1:251
>
> Hope this is it. :-/
No, you should set the PID to 0 or 0x1fff.


> - tune with szap to "Das Erste":
> # szap -x -n 1
> reading channels from file '/root/.szap/channels.conf'
> zapping to 'Das Erste':
> sat 0, frequency = 11837 MHz H, symbolrate 27500000, vpid = 0x0065, apid
> = 0x0066
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> status 07 | signal cdcd | snr 125d | ber 0000ffff | unc 0804fc24 |
> status 01 | signal d5d5 | snr 02ca | ber 0000ffff | unc 08040000 |
> status 01 | signal ffff | snr 0000 | ber 0000ffff | unc 08040000 |
> status 01 | signal ffff | snr 0000 | ber 0000ffff | unc 08040000 |
> status 07 | signal 7c7c | snr 2ad2 | ber 0000ffff | unc 08040000 |
> status 04 | signal ecec | snr 2cd4 | ber 0000ffff | unc 08040000 |
> status 05 | signal d8d8 | snr 2e24 | ber 0000ffff | unc 08040000 |
> status 05 | signal e0e0 | snr 2c14 | ber 0000ffff | unc 08040000 |
> status 07 | signal ecec | snr 291e | ber 0000ffff | unc 08040000 |
> status 07 | signal c1c1 | snr 0000 | ber 0000ffff | unc 08040000 |
>
> No error messages at least. Exit code is zero.
>
> - tune with szap to "T-DSL via Satellit", using the abovementioned
> entry:
> # szap -x -n 227
> reading channels from file '/root/.szap/channels.conf'
> zapping to 'T-DSLviaSat':
> sat 1, frequency = 10773 MHz H, symbolrate 22000000, vpid = 0x0000, apid
> = 0x0000
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> status 07 | signal bfbf | snr 1b1c | ber 0000ffff | unc 08049b50 |
> status 03 | signal 9090 | snr 249c | ber 0000ffff | unc 08040000 |
> status 01 | signal 6767 | snr 1e72 | ber 0000ffff | unc 08040000 |
> status 01 | signal 6767 | snr 31c2 | ber 0000ffff | unc 08040000 |
> status 01 | signal 6a6a | snr 3996 | ber 0000ffff | unc 08040000 |
> status 03 | signal 6b6b | snr 349c | ber 0000ffff | unc 08040000 |
> status 01 | signal 6767 | snr 3142 | ber 0000ffff | unc 08040000 |
> status 05 | signal d2d2 | snr 17f1 | ber 0000ffff | unc 08040000 |
> status 01 | signal 6262 | snr 197b | ber 0000ffff | unc 08040000 |
> status 05 | signal d4d4 | snr 26f5 | ber 0000ffff | unc 08040000 |
>
> Ditto.
>
> I don't know how to interpret the output by szap.
> Could somebody please help me and give me a hint what needs to be fixed?
Status is the bitfield of the frontend status flags, see the fe_status_t 
defines in include/linux/dvb/frontend.h.

signal is the signal strength value, snr the signal noise ratio. Both 
are 16bit values, they usually need to be about 60% of the full value 
(0xffff) to ensure reliable operation.

ber is the continous bit error rate, unc the number of uncorrectable 
blocks after the forward error correction unit.

In your case I'd check the antenna installation, the cable and try 
whether another receiver on this cable is operating properly. If that's 
the case I'd check whether the card is not broken, try e.g. the windows 
driver.

Holger



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