Hi,
Ra.M. schrieb:
Hartmut Hackmann wrote:
Hm, the LNA has such a high gain... i dont think that a
additional
amplifier
will give improvement. Please do the following: set the
options debug=1
for
the modules tuner and tda827x. and send me the kernel log of
driver load
and tuning attempts.
The card i had in hands had no sensitivity problems. But is
was a
'early
sample' You might decide to play with the antenna switch
config
entry
in saa7134-dvb.c.
Hartmut
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I have enabled debug=1 for modules tuner and tda827x; this is the
kernel log:
----------------------- driver load ------------------------
Mar 17 02:28:34 darkstar kernel: tuner 2-004b: chip at addr 4b is
a tda8290
Mar 17 02:28:34 darkstar kernel: tuner 2-004b: Setting mode_mask
to 0x0e
Mar 17 02:28:34 darkstar kernel: tuner 2-004b: Calling
set_type_addr for
type=54, addr=0xff, mode=0x04, config=0x02
Mar 17 02:28:34 darkstar kernel: tuner 2-004b: set addr for type -1
Mar 17 02:28:34 darkstar kernel: tuner 2-004b: defining GPIO
callback
Mar 17 02:28:34 darkstar kernel: tuner 2-004b: saa7133[0] tuner
I2C addr
0x96 with type 54 used for 0x0e
Mar 17 02:28:34 darkstar kernel: tuner 2-004b: defining GPIO
callback
Mar 17 02:28:34 darkstar kernel: tuner 2-004b: saa7133[0] tuner
I2C addr
0x96 with type 54 used for 0x0e
Mar 17 02:28:34 darkstar kernel: tda827x: tda827x_attach:
Mar 17 02:28:34 darkstar kernel: tda827x: tda827xa tuner found
Mar 17 02:29:09 darkstar kernel: tuner 2-004b: Cmd VIDIOC_S_STD
accepted
for analog TV
Mar 17 02:29:09 darkstar kernel: tuner 2-004b: switching to v4l2
Mar 17 02:29:09 darkstar kernel: tuner 2-004b: tv freq set to
400.00
Mar 17 02:29:09 darkstar kernel: tuner 2-004b: setting tda8290 to
system B
Mar 17 02:29:09 darkstar kernel: tuner 2-004b: tda827xa config is
0x02
Mar 17 02:29:09 darkstar kernel: tuner 2-004b: setting LNA to high
gain
Mar 17 02:29:09 darkstar kernel: tuner 2-004b: AGC2 gain is: 0
Mar 17 02:29:09 darkstar kernel: tuner 2-004b: setting LNA to low
gain
Mar 17 02:29:09 darkstar kernel: tuner 2-004b: tda8290 not locked,
no
signal?
Mar 17 02:29:09 darkstar last message repeated 2 times
Mar 17 02:29:09 darkstar kernel: tuner 2-004b: adjust gain, step
1. Agc:
75, ADC stat: 0, lock: 0
Mar 17 02:29:10 darkstar kernel: tuner 2-004b: adjust gain, step
2. Agc:
231, lock: 0
Mar 17 02:29:10 darkstar kernel: tuner 2-004b: adjust gain, step
3. Agc: 75
Mar 17 02:29:10 darkstar kernel: tuner 2-004b: Cmd
TUNER_SET_STANDBY
accepted for analog TV
------------------------- tuning attempts
---------------------------
Mar 17 02:30:40 darkstar kernel: tda827x: tda8275a AGC2 gain is: 0
Mar 17 02:31:11 darkstar last message repeated 3 times
Mar 17 02:32:13 darkstar last message repeated 12 times
Mar 17 02:32:51 darkstar last message repeated 10 times
Mar 17 02:34:32 darkstar last message repeated 14 times
Mar 17 02:34:39 darkstar last message repeated 2 times
Mar 17 02:37:13 darkstar kernel: tda827x: tda8275a AGC2 gain is: 0
Mar 17 02:38:16 darkstar last message repeated 10 times
Last night, for about 5 minutes, some channels have become
perfectly
stable;
probably, signal fluctuation?
Maybe, but see below.
I just noticed that one of the changes i made is not good. It depends
on the module load order whether it works or not. On your board, it is
important that the "analog tuner" is in standby mode when
dvb-t is running.
In your case, it seems to have worked but i am not sure. So if in doubt,
please try to load an analog tv application before using DVB-T until i
found a better solution.
The other point: there is a high signal amplitude at the antenna input.
But due to its principle, the tuner "sees" strong
transmitters on other
frequencies. Do you have a strong transmitter nearby? Is your antenna
cable properly shielded?
When you try to tune to a station, what does tzap tell you?
Hartmut
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