[linux-dvb] Diseqc tuning - dvbtune vs scan vs szap

Steven Ellis mail_lists at stevencherie.net
Fri Dec 15 03:01:43 CET 2006


Ok I have 4 satellites connected to my Diseqc switch and I'm having some
issues tuning to the various channels. The switch inputs are as follows

1 - Universal LNB pointing at Optus B1/D1
2 - 11300 LO LNB pointing at NSS5
3 - 11300 LO LNB pointing at AMC23
4 - 11300 LO LNB pointing at Optus B3

The card I'm using is a SkyStar 2, and the switch is supposed to support
command sets upto Diseqc 2.0

Now I can tune to all of the satellites using dvbtune version 0.5,
allowing for the LNB offet as follows

dvbtune -t 1 -f 1883000 -s 22500 -D 1 -p v -m
dvbtune  -t 1 -f 1312000 -s 28352 -D 2 -p v  -m
dvbtune -t 1 -f 1392000 -s 6510 -D 3 -p v -m
dvbtune -t 1 -f 1225000 -s 30000 -D 4 -p v -m

Now using dvbscan/scan and an appropriate config file I can scan B1 and
NSS5 but not AMC23 or B3. I'm wondering if the switch is working correctly.

scan -s 0 B1
-----
# Optus B1 satellite 160E
# freq pol sr fec
S 12483000 V 22500000 3/4
-----

 scan -s 1 -l 11300 NSS5
------
# NSS5 satellite
# freq pol sr fec
S 12612000 V 28352000 3/4
------

scan -s 2 -l 11300 AMC23
scanning AMC23
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
initial transponder 12692000 V 6510000 3
>>> tune to: 12692:v:2:6510
WARNING: >>> tuning failed!!!

------
# AMC23 satellite  172.0E
# freq pol sr fec
S 12692000 V 6510000 3/4
------

scan -s 3 -l 11300 B3
-----
# Optus B3 satellite
# freq pol sr fec
S 12525000 V 30000000 3/4
-----

So any ideas what the problem is with scan as this also means szap
doesn't work which makes changing channels across the switches very hard.

Also does anyone know a way to embed the offset in the szap
channels.conf file for the LNB type, or should I just adjust the numbers
to pretend I have a 10600 LOF LNB.

These problems mean I can't get MythTV to handle the diseqc correctly.

Steve



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