[linux-dvb] Low symbol rates on FF DVB cards

Anssi Hannula anssi.hannula at gmail.com
Sat Dec 3 14:42:44 CET 2005


Klaus Schmidinger wrote:
> Full featured DVB cards (Siemens/Technotrend AV7110 design)
> apparently have trouble with receiving channels at very low
> symbol rates. An example is
> 
>   TVS Teleport
> Bonn;DMV:11535:vC34:S1.0W:5632:308+8190:256=eng,257=eng:0:2:1:65535:1:0
> 
> with a symbol rate of 5632 (that transponder isn't always on, though).
> My FF DVB card can't receive this channel, so I have to receive it
> with a budget card, which is able to handle this symbol rate.
> 

> Unfortunately both my FF card and my budget card report the same
> minimum symbol rate:

>   symbol_rate_min 1000000

> 
> So I'm afraid I can't use this to make that decision.
> 
> Is there anything else I could use, or do I just have to
> check for the existence of a video and audio device (which
> indicates that there is an MPEG decoder) and in that case
> refuse to switch to a channel with a symbol rate of, say,
> less than 10000 (in VDR's channels.conf notation)?

I can't help with your actual problem, but here it appears some FF cards
support rates 1-8, some cards do not:
http://www.linuxtv.org/wiki/index.php/PCI_devices_DVB-S

-- 
Anssi Hannula




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