AW: [vdr] Problems receiving couple of german channels DVB-S

martin martin at air-maxx.net
Mon Jan 29 17:05:46 CET 2007


Okay, 

we need to put then an eye on your hardware setup - this is a problem before
the DVB-S cards. You where talking about 3 DVB-S cards, but how many LNB's
do you have? How have you wired the system? We have: horizontal / vertical
polarization and then lower and upper band! This makes 2x2 = 4 possible
areas. So, if you go with more than 2 cards - 3 or 4 or more, you need a
quad LNB with maybe some additional hardware. 


       Martin
       
       
-----Ursprüngliche Nachricht-----
Von: vdr-bounces at linuxtv.org [mailto:vdr-bounces at linuxtv.org] Im Auftrag von
Peer Oliver Schmidt
Gesendet: Montag, 29. Januar 2007 15:31
An: VDR Mailing List
Betreff: Re: [vdr] Problems receiving couple of german channels DVB-S

Hello list,

> I have problems receiving some channels (ARD, ZDF,N3, DMAX) in good
> quality. Receiving other channels (SAT.1, RTL, Pro7, Das Vierte) works
> just fine.

I've tried using szap to see if I can find the problem in one of my
DVB-S cards. Unfortunately, no matter which card I use, I have bad
reception for a couple of channels, and good reception for others.

Here is an excerpt from the szap log:

Bad reception (ZDF):

vdr:~# szap -a 0 -n 2
reading channels from file '/root/.szap/channels.conf'
zapping to 2 'ZDF':
sat 0, frequency = 11954 MHz H, symbolrate 27500000, vpid = 0x006e,
apid = 0x0078
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
status 00 | signal b9b9 | snr fffe | ber 00000003 | unc 00000003 |
status 01 | signal b9b9 | snr fffe | ber 00000003 | unc 00000003 |
status 00 | signal b9b9 | snr fffe | ber 00000003 | unc 00000003 |
status 1f | signal b9b9 | snr fffe | ber 0000e668 | unc 0000e668 |
FE_HAS_LOCK
status 1f | signal baba | snr fffe | ber 0000000c | unc 0000000c |
FE_HAS_LOCK
status 1f | signal b9b9 | snr fffe | ber 0000000b | unc 0000000b |
FE_HAS_LOCK
status 1f | signal b9b9 | snr fffe | ber 0000001d | unc 0000001d |
FE_HAS_LOCK
status 1f | signal b9b9 | snr fffe | ber 00000021 | unc 00000021 |
FE_HAS_LOCK



Good reception (RTL):
vdr:~# szap -a 0 -n 5
reading channels from file '/root/.szap/channels.conf'
zapping to 5 'RTL':
sat 0, frequency = 12188 MHz H, symbolrate 27500000, vpid = 0x00a3,
apid = 0x0068
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
status 01 | signal b8b8 | snr fffe | ber 0000001a | unc 0000001a |
status 1f | signal b7b7 | snr fffe | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal b9b9 | snr fffe | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal b8b8 | snr fffe | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal b9b9 | snr fffe | ber 00000000 | unc 00000000 |
FE_HAS_LOCK
status 1f | signal b9b9 | snr fffe | ber 00000000 | unc 00000000 |
FE_HAS_LOCK

The interrupts:

vdr:~# cat /proc/interrupts
           CPU0
  0: 2373754725    IO-APIC-edge  timer
  1:          9    IO-APIC-edge  i8042
  8:          1    IO-APIC-edge  rtc
  9:          0   IO-APIC-level  acpi
 14:    4835536    IO-APIC-edge  ide0
 15:        219    IO-APIC-edge  ide1
 50:          0   IO-APIC-level  ohci_hcd:usb1
 58:          0   IO-APIC-level  ehci_hcd:usb2
 66:  441811465   IO-APIC-level  eth0
217:  298617322   IO-APIC-level  saa7146 (0)
225:  265391314   IO-APIC-level  saa7146 (1)
233:  271195814   IO-APIC-level  saa7146 (2)
NMI:          0
LOC: 2373832282
ERR:          0
MIS:          0

lshw Information for one of the cards (all identical):

        *-multimedia:0
             description: Multimedia controller
             product: SAA7146
             vendor: Philips Semiconductors
             physical id: 6
             bus info: pci at 05:06.0
             version: 01
             width: 32 bits
             clock: 33MHz
             capabilities: bus_master
             configuration: driver=budget dvb
             resources: iomemory:da000000-da0001ff irq:217

Any and help is greatly appreciated.
-- 
Best regards

Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA


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