Petri Helin wrote:
Thomas Kaiser wrote:
Petri Helin wrote:
Thomas Kaiser wrote:
Petri Helin wrote:
Thomas Kaiser wrote:
Suur Karu wrote:
Thomas Kaiser wrote:
Suur Karu wrote:
> My Technotrend Connect C-1200 USB DVB-C adapter have problem
> to tunning to 170MHz (no signal at all), but instead of it I
found missing channels on frequency 178MHz (not listed in NIT
table), but with big disturbance in picture and not stable LOCK
(not usable).
>
> dmesg:
> ttusb_init_controller: unknown STC version V 2.5, please report!
> ttusb_init_controller: dsp-version: 0.0
> DVB: registering new adapter (Technotrend/Hauppauge Nova-USB).
> DVB: registering frontend 1 (ST STV0297 DVB-C)...
> usbcore: registered new driver ttusb
If your device is using the philips tda1316 tuner, i think there
is a problem in setting the correct Band. 162 MHz and above
should be band 2 (Mid-Band). But in
dvbc_philips_tdm1316l_tuner_set_params band 1 is set for
frequencies below 200 MHz:
// determine charge pump
tuner_frequency = params->frequency;
if (tuner_frequency < 87000000) {return -EINVAL;}
else if (tuner_frequency < 130000000) {cp = 3; band = 1;}
else if (tuner_frequency < 160000000) {cp = 5; band = 1;}
else if (tuner_frequency < 200000000) {cp = 6; band = 1;} <<==
else if (tuner_frequency < 290000000) {cp = 3; band = 2;}
else if (tuner_frequency < 420000000) {cp = 5; band = 2;}
else if (tuner_frequency < 480000000) {cp = 6; band = 2;}
else if (tuner_frequency < 620000000) {cp = 3; band = 4;}
else if (tuner_frequency < 830000000) {cp = 5; band = 4;}
else if (tuner_frequency < 895000000) {cp = 7; band = 4;}
else {return -EINVAL;}
Try to change to 2:
else if (tuner_frequency < 200000000) {cp = 6; band = 2;}
Yes! This fixed tuning problem. Thank You!
Regards,
SK
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Andrew, can you please add this small change to the official sources?
Thank you, Thomas
Just to let you all know, in case you didn't see an earlier post
about tuning problems with TechnoTrend's C1500 card, the above
change broke tuning on those cards with frequencies under 160MHz.
-Petri
The above change should only affect frequencies between 160MHz and
200MHz. Can you explain why it affects tunning on frequencies
_under_ 160MHz?
Thomas
I can only guess, maybe someone else can explain this. But I noticed
that there is a suspicious line just above the changed part of the
code. An amount of 36.125 MHz is added to the frequency before band
is defined:
// determine charge pump
tuner_frequency = params->frequency + 36125000;
if (tuner_frequency < 87000000)
return -EINVAL;
else if (tuner_frequency < 130000000) {
cp = 3;
band = 1;
} else if (tuner_frequency < 160000000) {
cp = 5;
band = 1;
} else if (tuner_frequency < 200000000) {
cp = 6;
-Petri
Hello Petri
You refer to the wrong change.
The code change above suggested by me is for the USB device.
It is in
v4l-dvb/linux/drivers/media/dvb/ttusb-budget/dvb-ttusb-budget.c and
got positive feedback.
I think your code snip is from
v4l-dvb/linux/drivers/media/dvb/ttpci/budget-ci.c
and I don't know why this frequency offset is needed for the PCI device?
Anyway, it is not needed for the USB device.
You could start a new thread on the mail list and ask for what these
offset is needed.
Hope this helps.
Thomas
Hi,
I refer to this change in budget-ci.c:
http://linuxtv.org/hg/v4l-dvb?cmd=changeset;node=e7c424bbf9aa;style=gitweb
----- The change log ----------
Fix TD1316 tuner for DVBC
committer Andrew de Quincey <adq_dvb@xxxxxxxxxxxxx>
Wed Nov 22 21:15:19 2006 +0000 (5 months ago)
changeset e7c424bbf9aa
tree 77784ed2ef1c
parent fbd952a3bd91
child 36f10656f43f
Fix TD1316 tuner for DVBC
From: Thomas Kaiser <linux-dvb@xxxxxxxxxxxxxxx>
If your device is using the philips tda1316 tuner, i think there is a
problem in setting the correct Band. 162 MHz and above should be band 2
(Mid-Band). But in dvbc_philips_tdm1316l_tuner_set_params band 1 is set
for frequencies below 200 MHz.
Signed-off-by: Thomas Kaiser <linux-dvb@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew de Quincey <adq_dvb@xxxxxxxxxxxxx>
linux/drivers/media/dvb/ttpci/budget-ci.c file | revisions
--- a/linux/drivers/media/dvb/ttpci/budget-ci.c Wed Nov 22 21:02:58 2006
+0000
+++ b/linux/drivers/media/dvb/ttpci/budget-ci.c Wed Nov 22 21:15:19 2006
+0000
@@ -952,7 +952,7 @@ static int dvbc_philips_tdm1316l_tuner_s
band = 1;
} else if (tuner_frequency < 200000000) {
cp = 6;
- band = 1;
+ band = 2;
} else if (tuner_frequency < 290000000) {
cp = 3;
band = 2;
--------------------------------------
Has the change been applied to budget-ci.c in error? At least it looks
like the change has not been applied to dvb-ttusb-budget.c.
-Petri
Yes, it looks like. I never checked, because I don't own this USB device
and just made the driver work for a friend some time ago. But he don't
use these frequencies.
Anyway, looks like a misunderstanding between me and Andrew, the change
should be for the USB device.
My fault, I did not provide a patch. Just a note by mail :-(
I will try to work this out.
Thanks for the hint.
Thomas
--
http://www.kaiser-linux.li
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