[linux-dvb] TT-1500 / TDA10046

Jouni jouni76 at fastmail.fm
Wed Feb 21 20:06:56 CET 2007


Yes, as there is no 5 volts, it should not affect antenna signal
reception (with antenna without amp).
So your problem is something else...

Have you tested with w_scan:
http://www.edafe.org/vdr/wscan.html
It is sometimes easier to use, as it autoscans all frequencies, so it
does not need any initial scanning data.




On Wed, 21 Feb 2007 18:37:50 +0000, "Nicholas Fearnley"
<nfearnley at dmpip.tv> said:
> 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  
> > would
> > 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  
> >>> feed
> >>> 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  
> >>>> tried
> >>>> 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 2.6.18.1.  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  
> >>>> (version
> >>>> 20).
> >>>>
> >>>> 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  
> >>>> one
> >>>> to test with.
> >>>>
> >>>> Nick
> >>>>
> >>>>
> >>>> _______________________________________________
> >>>> linux-dvb mailing list
> >>>> linux-dvb at linuxtv.org
> >>>> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> >>> -- 
> >>>   Jouni
> >>>   jouni76 at fastmail.fm
> >>>
> >>> -- 
> >>> http://www.fastmail.fm - A no graphics, no pop-ups email service
> >>>
> >>
> > -- 
> >   Jouni
> >   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
> > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> 
> Nicholas Fearnley
> Digital Media Projects Ltd
> 1 City Square
> Leeds
> LS1 2ES
> 
> t: 011 33 66 33 66
> m: 07796 147 320
> e: nfearnley at dmpip.tv
> w: www.dmpip.tv
> 
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-- 
  Jouni
  jouni76 at fastmail.fm

-- 
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