[linux-dvb] Re: DVB-C QAM128 errors and signal strength

[Jaakko Hyvätti <jaakko@hyvatti.iki.fi>]

  Hi Jarkko,

  I have Hauppage DVB-C in HTV network, and for the past year we have
been tuning the ves1820 frontend code in DVB driver to fit both
Siemens and Hauppage cards.  The current driver as released is
blindingly fast and good with Hauppage.  Now to make sure the
compatibility with Siemens has not been sacrificed, could you check
a few things that have been changed during that year:

1. How much is the automatic frequency correction (AFC) adjusting the
frequency with QAM64 and QAM128 channels?  Use the getfrontend.c from
http://www.iki.fi/hyvatti/dvb/ to read the tuned value, or enable
debugging in ves1820.c and read the values from syslog.

2. This patch was added at one point to the driver:

ves1820.c:

 	static const u8 reg0x00 [] = { 0x00, 0x04, 0x08, 0x0c, 0x10 };
-	static const u8 reg0x01 [] = {  140,  140,  106,  120,   92 };
+	static const u8 reg0x01 [] = {  140,  140,  106,  100,   92 };
 	static const u8 reg0x05 [] = {  135,  100,   70,   54,   38 };
 	static const u8 reg0x08 [] = {  162,  116,   67,   52,   35 };
 	static const u8 reg0x09 [] = {  145,  150,  106,  126,  107 };

So you see one value 120 which is documented in ves1820 datasheet was
changed to 100, that gave a lot better tuning on some cards.  Maybe you
should try the original 120 again?

Jaakko

-- 
Foreca Ltd                                           Jaakko.Hyvatti@foreca.com
Pursimiehenkatu 29-31 B, FIN-00150 Helsinki, Finland     http://www.foreca.com


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