[linux-dvb] TT Budget C-1500 PCI bad signal?

Rutger ter Borg rutger at terborg.net
Sun Nov 18 11:59:19 CET 2007

Dear Linux DVB developers,

I've been trying to get DVB working on a system. I have been trying to get it 
working with a KNC1 TV station, which is RMA now. Currently I'm trying to get 
it working with a Technotrend C-1500 PCI + CI. The CAM is an alphacrypt with 
firmware version 3.11. All channels are scambled. The CAM is known to be able 
to decrypt irdeto, used by nl-Casema, so that should work.

Although I got rid of the CAM inserted/ejected loop (mentioned in an earlier 
post of mine):

kernel: Linux video capture interface: v2.00
kernel: saa7146: register extension 'budget_av'.
kernel: saa7146: register extension 'budget_ci dvb'.
kernel: PCI: Enabling device 0000:00:08.0 (0000 -> 0002)
kernel: ACPI: PCI Interrupt 0000:00:08.0[A] -> GSI 19 (level, low) -> IRQ 201
kernel: saa7146: found saa7146 @ mem ffffc2000006ae00 (revision 1, irq 201) 
kernel: saa7146 (0): dma buffer size 192512
kernel: DVB: registering new adapter (TT-Budget-C-CI PCI).
kernel: adapter has MAC addr = 00:d0:5c:68:3b:35
kernel: input: Budget-CI dvb ir receiver saa7146 (0) as /class/input/input2
kernel: budget_ci: CI interface initialised
kernel: DVB: registering frontend 0 (ST STV0297 DVB-C)...
kernel: dvb_ca adapter 0: DVB CAM detected and initialised successfully

tuning to channels is something different with this card, the signal and snr 
is very bad:

using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
234 Nederland 2:388000000:INVERSION_AUTO:6875000:FEC_NONE:QAM_64:181:182:8005
234 Nederland 2: f 388000000, s 6875000, i 2, fec 0, qam 3, v 0xb5, a 0xb6
status 00 | signal 01ff | snr 0a88 | ber 00000000 | unc 00000000 |
status 1f | signal 0316 | snr 0cd2 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal 0316 | snr 0dc5 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal 0316 | snr 0d63 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal 0315 | snr 0cde | ber 00000000 | unc 00000000 | FE_HAS_LOCK

whereas the KNC1 had good reception:
status 1f | signal d2d2 | snr f3f3 | ber 00000000 | unc 00000000 | FE_HAS_LOCK

The result is the same with or without CAM inserted with the Technotrend card. 
I have tried the following applications:
* czap
* kafffeine
* mythtv-backend

however without success. Tuning usually works, EIT works, the CAM is 
successfully recognized (by mythtv), but the signal strength is bad for the 
Technotrend card (with and w/o CAM). I haven't seen any picture yet, from any 
of the two cards. 

It seems that it is known by Technotrend, recently mentioned in the following 


altough I'm not sure whether this is connected to this problem. 

If you would have hints, suggestions, or pointers on how to proceede, I would 
greatly appreciate it. Many thanks in advance, 

Kind regards,

Rutger ter Borg

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