Tuning issue with DViCO FusionHDTV DVB-T Plus (ZL10353)

[Aaron Sedgmen <six_stitcher (at) yahoo.com.au>]

Rob Browne wrote:
> Hi,
> Have the same card, using 2.6.17-rc1. In Melbourne, ABC, 7 and 10 are ok.
> Nine cannot get FE lock, SBS the lock fluctuates.
> 
> Previously using bttv DVB card, and all channels were ok.
> 
> Rob.
> 
> 
> On 5/11/06, Aaron Sedgmen <sedgmen (at) netspeed.com.au> wrote:
>> 
>> Greetings,
>>
>> I am wondering if someone can help with a problem I'm having getting my
>> DVICO FusionHDTV DVB-T Plus PCI card (ZL10353 chip) to tune to one
>> particular network here in Canberra, Australia.  The card will tune to
>> all available networks without a problem, except for ABC on 205625000
>> Hz.
>>
>> When using the scan utility to generate the channels.conf, tuning the
>> ABC channels on 205625000 will often fail, and can sometimes take four
>> or five attempts.  I'm using the au-canberra file provided with scan.
>>
>> Using tzap with the resulting channels.conf file gives the following
>> output:
>>
>> [mythtv (at) localhost ~]$ /usr/src/dvico/linuxtv-dvb-apps-1.1.0/util/szap/tzap
>> "ABC TV"
>> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
>> tuning to 205625000 Hz
>> video pid 0x0200, audio pid 0x028a
>> status 00 | signal 4d70 | snr 7a7a | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr 5353 | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr 5353 | ber 0804a0e0 | unc 00820ff4 |
>> .
>> .
>> status 07 | signal 4d70 | snr 5353 | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr 5353 | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr 4f4f | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr 5353 | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr 5a5a | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr 5a5a | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr 5d5d | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr f1f1 | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr f6f6 | ber 0804a0e0 | unc 00820ff4 |
>> status 1f | signal 4d70 | snr f5f5 | ber 0804a0e0 | unc 00820ff4 |
>> FE_HAS_LOCK
>> status 1f | signal 4d70 | snr fafa | ber 0804a0e0 | unc 00820ff4 |
>> FE_HAS_LOCK
>> status 1f | signal 4d70 | snr fafa | ber 0804a0e0 | unc 00820ff4 |
>> FE_HAS_LOCK
>> status 07 | signal 4d70 | snr fafa | ber 0804a0e0 | unc 00820ff4 |
>> status 1f | signal 4d70 | snr dada | ber 0804a0e0 | unc 00820ff4 |
>> FE_HAS_LOCK
>> status 1f | signal 4d70 | snr d9d9 | ber 0804a0e0 | unc 00820ff4 |
>> FE_HAS_LOCK
>> status 07 | signal 4d70 | snr dada | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr 0000 | ber 0804a0e0 | unc 00820ff4 |
>> status 07 | signal 4d70 | snr 0000 | ber 0804a0e0 | unc 00820ff4 |
>> status 05 | signal 4d70 | snr 0000 | ber 0804a0e0 | unc 00820ff4 |
>> .
>> .
>>
>> The pattern is consistent for each tzap attempt.  snr values will
>> initially sit around 5353 for about 20 cycles then rise into the f
>> values and a lock will be achieved for 3-5 cycles.  snr values then drop
>> off to 0000 and stay there.
>>
>> I've tested the card on a Windows system and have no problems tuning to
>> ABC channels.  I've been testing with rabbit ears and a roof mounted
>> aerial with pretty much identical results.
>>
>> The fact that I can tune ABC in Windows suggests that the card and
>> reception are OK, so I'm wondering if it's an issue with the driver.
>> I'm using Fedora Core 5 (kernel 2.6.16-1.2111_FC5), and have built the
>> v4l-dvb modules from v4l mercurial to get the ZL10353 support.
>>
>> This is one of the last problems to resolve in my mythTV system, and any
>> help would be much appreciated.
>>
>> Cheers,
>>
>> Aaron.
>>
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I have since discovered via another forum that the current Linux driver for 
the ZL10353 chip does not support channels operating on an offset frequency, 
as is the case with the station I am having the problem with.  The driver 
author does not yet have sufficient documentation from the chip manufacturer 
to be able to implement support for offset frequencies.

http://forums.whirlpool.net.au/forum-replies.cfm?t=521910 contains the 
relevant thread.

Aaron.
  






		
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