Broadcom 3510 was Re: [linux-dvb] Question regarding Air2PC r3 (Nxt2002 based)...answer may have implications for Nxt200x driver

Boleslaw Ciesielski bolek-mythtv at curl.com
Tue Nov 29 17:11:47 CET 2005


Patrick Boettcher wrote:
>>> Anyways, the r3 does demodulate QAM -- you can read about some user 
>>> experiences here: http://www.avsforum.com/avs-vb/showthread.php?t=509869
>>>
>>
>> In regards to the Broadcom 3510 based Air2PC r0.2 card still selling 
>> on ebay, it appears from the Broadcom product brief 
>> (http://www.broadcom.com/collateral/pb/3510-PB05-R.pdf ) that it 
>> should be able to handle demodulation of a QAM source.  Anyone know of 
>> any show stoppers that might prevent that from being realized? (Patrick?)
> 
> 
> Maybe it is working with QAM64, I just tested it with QAM256 and there 
> was a unreasonable high error rate.
> 
> BBTI told me that there are some hardware problems (either in the demod 
> or in the tuner not being able to shift QAM-signals correctly to IF) 
> which prevent the device from being used with QAM.

Yes, and this also applies to the nxt2002 based Air2PC. See

http://www.gossamer-threads.com/lists/mythtv/dev/120371

There are some people who have it working but that's a small minority. 
For most people QAM is a no go and it does seem like a hardware issue. 
(Could it be QAM64 vs QAM256?)

OTOH, the new lgdt3303 based card works beautifully with QAM.

Bolek



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