[linux-dvb] [PATCH] DiSEqC support for cx24123 based cards

Steve Toth stoth at hauppauge.com
Mon Dec 5 16:11:05 CET 2005

Vadim Catana wrote:
> Signed-off-by: Vadim Catana <skystar at moldova.cc>
> Hi,
> The first patch adds DiSEqC support for cards based on cx24123
> demodulator.
Excellent. Many thanks Vadim.
> The second patch changes the frequency ranges used to select
> the local oscilator of the cx24109 tuner. With the current
> settings I can not tune to some channels. This patch was tested
> only with KWorld DVB-S 100 card and needs to be tested with
> Hauppauge cards before applying to CVS.
I noticed that the bands in the datasheet DO NOT match field testing. I 
moved three of them but did not have enough coverage here to test them 
all. It's good that you also noticed/fixed the issue. I noticed issues 
at the 'edge' of bands. I thought field tester may find more. :)

> There is also another problem. The card does not tune to
> channels with low symbol rates, althow it works well in Windows XP
> in the same computer. I tryed different settings of the cx24123,
> but no success. I noticed that the cx24123 datasheet provided by
> Steve Toth does not contain some needed data. For example, the
> description for
I mentioned the symbol rate issues in the original patch email.

I've have seen the same problem with 5MSps channels. Is this not a basic 
table/data problem, based on a symbol rate lookup?

> Steve, could you complete the datasheet please ? Do the Hauppauge
> cards also have problems with channels with low symbol rates ?

If it's not in the cx24123 or 24109 datasheets then Conexant have not 
documented it. I asked for as much as possible but I spent weeks 
negotiating what we have. No more information is available.

Yes. I've just never looked into the problem. I assume the table is wrong.

I take it that someone send you the datasheet then?



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