[linux-dvb] TT-1500 / TDA10046
nfearnley at dmpip.tv
Wed Feb 21 19:37:50 CET 2007
The Jumper is removed, there is 0 volts provided on the antenna input
of the T-1500.
The resistance of the antenna itself shows 3.3 Ohms which is quite
low, but as the booster is removed this should be OK I think?
On 21 Feb 2007, at 16:55, Jouni wrote:
> You can check the antenna with ohm-meter, if it is near 0, then it
> short the 5V supply. But if you disabled the 5V with jumper
> (checked it
> with voltmeter?) it would not make difference.
> On Wed, 21 Feb 2007 14:12:04 +0000, "Nicholas Fearnley"
> <nfearnley at dmpip.tv> said:
>> I have removed the jumper on the card that provides the amp (there is
>> only one jumper).
>> But as to whether or not the antenna still shorts I'm not sure. Can
>> I check with a multimeter?
>> I read about turning off the amp (I2C 0x65) which means little to
>> me! It's on the wiki.
>> On 21 Feb 2007, at 10:44, Jouni wrote:
>>> What type of antenna you are using?
>>> My TT-1500 will not get good signal, if the antenna shorts the 5V
>>> for antenna amp from
>>> the cards antenna in -connector.
>>> On Tue, 20 Feb 2007 23:37:06 +0000, "Nicholas Fearnley"
>>> <nfearnley at dmpip.tv> said:
>>>> I have had real problems getting the TT-1500 (DVB-T) working.
>>>> I have been using dvbtune for some diagnostics.
>>>> The following should yield BBC Multiplex on my local transmitter
>>>> dvbtune -c 0 -qam 16 -gi 32 -cr 3_4 -bw 8 -tm 2 -f 722000
>>>> It does not, I tried adding 166Khz (722166) but no luck. So I
>>>> just working my way through some frequencies. I can get the
>>>> FE_STATUS to report FE_HAS_SIGNAL on some frequencies. I even get
>>>> FE_HAS_CARRIER on occasion but never any more than that.
>>>> Does this mean the tuner is getting *something*. It's not
>>>> random for
>>>> sure, I always get this result on the few frequencies I have tried.
>>>> I am using 18.104.22.168. I know the signal (antenna) to be OK as I get
>>>> no issues with a CX based DVB-T module, on any frequency I pick.
>>>> This has to be a driver or settings issue. I compile the relevant
>>>> modules into the kernel, I get valid firmware loads in dmesg
>>>> I can insert relevant debugging code if needed - if anyone has any
>>>> ideas what might help. I can send a TT unit out if anyone needs
>>>> to test with.
>>>> linux-dvb mailing list
>>>> linux-dvb at linuxtv.org
>>> jouni76 at fastmail.fm
>>> http://www.fastmail.fm - A no graphics, no pop-ups email service
> jouni76 at fastmail.fm
> http://www.fastmail.fm - Does exactly what it says on the tin
> linux-dvb mailing list
> linux-dvb at linuxtv.org
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