Hi, Folks
Peter D. wrote:
On Sunday 17 September 2006 16:18, Philip Shead wrote:
Hartmut Hackmann wrote:
Hi,
Peter D. wrote:
On Friday 15 September 2006 06:16, Hartmut Hackmann wrote:
Hi, Peter
Peter D. wrote:
Hi,
I have an MSI TV@nywhere A/D that mostly works when "saa7134
card=94" is in /etc/modprobe.preload. One of the interesting
quirks is that it does not recognize digital channel 7. (I
think that that is transmitted on physical channel 6.) It can
find and display all of the other channels, digital and
analogue, in the local area (Melbourne Australia). Signal
strength should be O.K. My other dvb-t card can receive all of
the local channels, including ch 7.
Any clues?
> >>> This can easily be a problem in your channels.conf file. There
are 2 possible causes:
- some onf the conding parameters like FEC or GI are wrong.
Some channel decoder ignore them, the driver for the tda10046
does not. - In some countries, the transmitters are +/- 167kHz
off the center frequencies. With the current driver, the
tda10046 can't lock with this offset,you need to correct the
center frequency.
How do you determine what the correct center frequency is?
Trial and error edits to /etc/dvb/channels.conf-dvbt-australia?
Or do I just wait until the driver evolves to the standard of
the driver for the Kworld with its cx8800?
Try and error or search for appropriate information.
I will change the locking algorithm some time. But this is a
difficult change and definitely not be there within few days.
Well I'm bemused by this. I have had the same card in my desktop
box (with no other pci card in it) and I had perfect service
on all 5 channels (working off the same frequencies as Peter D).
But today I pulled it out of that machine and stuck it in
my mythbox (with a Visionplus branded Twinhan card (dvb-bt8xx)
and a Kworld DVB-T card (using cx88-dvb)) and I am now
suffering the exact same problem with Channel 7 being unable
to tune. This machine has a much better antenna input (being
a short better shielded cable from a wall socket v 3 cables
strung together over 10m) and even skipping the passthrough
on the kworld and putting the antenna into the msi card by
itself Channel 7 is not visible.
So, when the signal goes from the wall socket to the Kworld DVB-T card
in the first computer, out of the Kworld, across the room, into the
MSI in a different computer it can tune to channel 7. But when the
signal goes directly from the wall socket to the MSI it can not tune
to channel 7. This is interesting.
On both machines I have a
very old version of kaxtv (0.23) (config file copied from one
to the other) and on one the card could receive the missing
channel but on other it does not work.
My other card is a Kworld V-Stream Xpert DTV DVB-T with Connexant
chips and a Zarlink tuner.
Something is interacting badly with something else. It could be that
each component behaves by itself but the system is unstable, or maybe
one (or more) component is broken in such a way that a simple system
can cope but a complex one can not.
Maybe the signal strength is too strong. I'll try attenuating it
later.
This is possible with this tuner type. It has no sharp preselection,
so a very strong transmitter in the same band can distrb another.
An attenuator might help.
Maybe EMF from one card is interfering with the other. I might try
putting an insulated sheet of metal between the cards. That could be
rather nasty if I short things out.
Other people are running multiple tuner cards, so I guess it is
unlikely that one driver is interfering with the other - unless there
is something really odd about the MSI.
Is the tuner of the MSI card shielded ?
Hartmut
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