[linux-dvb] Re: Tuning problems with TT DVB-C 1500 (saa7146
+stv0297) and QAM128
tonilind.ml at nic.fi
Mon Aug 22 13:06:04 CEST 2005
On Sunday, August 21, 2005 9:29 PM,
Patrick Boettcher <patrick.boettcher at desy.de> wrote:
> Toni, don't case about the signal and snr values as longas ber and
> unc is 0. Most of the signal and snr calculation stuff need
> floating-point-operations which can't be done in a kernel module,
> this the signal and snr values depend on the modulation-driver and
> are most of the time "incorrect".
> Besides the long time it takes for to get a lock the reception looks
> good to me. Do you still have problems when watching video?
Well, if I can get it to lock to a channel, then there are no problems.
Picture and sound are OK. But it's really occasional to get a lock...
Sometimes it takes maybe 5 seconds but sometimes it can take several minutes
(depending on what channel I'm trying).
I put the card again into my Windows machine and checked how things are with
TT's software. Tuning usually takes about 1-2 seconds, sometimes a few
seconds longer - seems to be OK. Signal quality is always 100 % and signal
level is changing between about 60-70 %. I tried to use an antenna amplifier
but that didn't make any notable difference in those levels (the label on
the device says VHF/UHF/FM Amplifier, freq. 40-862 MHz, gain 20 dB, gain
control -12 dB, noise figure 5 dB, max. output 85 dBuV). BTW, if I unplug
the antenna cable the signal level shown is about 87 %. ;-)
My friend (who is a programmer) is going to try to make your stv0297 code
working with the current CVS code. He doesn't have access to a network with
QAM128 modulation or a DVB-C adapter with stv0297 but he'll use my linux box
Toni Lindroos <tonilind.ml@*NOSPAM*nic.fi>
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