[linux-dvb] DiSEqC trouble with TT S-1500
Remy Bohmer
linux at bohmer.net
Wed Feb 20 20:24:34 CET 2008
Hello All,
Maybe I have the answer:
I also had problems with switches and LNBs which did not want to work properly.
Behind 1 receiver it worked properly, but behind another 2 different
DVB-S PCI cards, it just failed. I never suspected the LNB/Switch
setup, because it worked behind another receiver.
But, In the end it turned out that there was 1 LNB in my setup that
caused all the trouble, that LNB refused to cooperate with the
switches and other LNBs, when a DVB-S PCI card was used (both
Technisat Skystar 1CI, and TT-S1500). Once switched to this LNB, the
complete setup failed to work from that moment on. I could never
switch back to 1 of the previous LNBs, but the last (buggy) LNB still
worked if I switched back to it.
So, my advice is to start with 1 LNB behind a switch, once it works,
add another one, check if both LNBs still works, if so, add another
LNB and so on. Maybe you end up, just like me, with 1 LNB that
destroys the complete behavior.
So, my 3 TT-S1500s are properly working here now with MythTv and
DiseqC switches with 4 LNBs per card/switch. So, it _can_ work...
Good luck!
Kind Regards,
Remy
2008/2/20, P. van Gaans <w3ird_n3rd at gmx.net>:
> On 02/20/2008 10:48 AM, Doru Marin wrote:
> > P. van Gaans wrote:
> >> On 02/18/2008 02:04 PM, Doru Marin wrote:
> >>
> >>> P. van Gaans wrote:
> >>>
> >>>> On 02/16/2008 01:20 AM, P. van Gaans wrote:
> >>>>
> >>>>
> >>>>> On 02/13/2008 09:21 PM, P. van Gaans wrote:
> >>>>>
> >>>>>> On 02/13/2008 03:01 PM, Doru Marin wrote:
> >>>>>>
> >>>>>>> Hi,
> >>>>>>>
> >>>>>>> Can you explain how you select those 4 positions ? DiSEqC
> >>>>>>> commands or tone/voltage changes ?
> >>>>>>> Also can you determine the input type of those positions (Hi/Low,
> >>>>>>> H/V, etc) ? A scenario to see when and why that happens, would be
> >>>>>>> more useful.
> >>>>>>>
> >>>>>>> P. van Gaans wrote:
> >>>>>>>
> >>>>>>>> Hi,
> >>>>>>>>
> >>>>>>>> I've got a Technotrend S-1500 (if it matters: I use it with
> >>>>>>>> Kaffeine 0.8.3). It works mostly fine, but there's a strange
> >>>>>>>> problem. With my Spaun 4/1 DiSEqC switch (they cost approx 25-40
> >>>>>>>> euro), I can only switch without trouble to position 1 and 2. If
> >>>>>>>> I tune directly to position 3 it won't lock.
> >>>>>>>>
> >>>>>>>> However, if I first tune to a channel on position 1 or 2 and try
> >>>>>>>> a channel on position 3 after that, it will work. Position 4
> >>>>>>>> however is completely unreachable.
> >>>>>>>>
> >>>>>>>> On a standalone receiver, there's no trouble with the same cable.
> >>>>>>>>
> >>>>>>>> Now Spaun is a really expensive and respected brand. So their
> >>>>>>>> switches possibly work in a different way, because a cheap
> >>>>>>>> Maximum 4/1 switch works perfectly with the S-1500. Position 1,
> >>>>>>>> 2, 3 and 4 all work perfectly. I also did some "dry testing"
> >>>>>>>> indoors and it looks like a 7 euro Satconn 4/1 switch would also
> >>>>>>>> work fine, but a 17 euro Axing SPU 41-02 probably won't.
> >>>>>>>>
> >>>>>>>> I'm guessing this could be solved in stv0299.c but I'm not much
> >>>>>>>> of an expert. I took a look at the code but I'm not really sure
> >>>>>>>> what to do.
> >>>>>>>>
> >>>>>>>> _______________________________________________
> >>>>>>>> linux-dvb mailing list
> >>>>>>>> linux-dvb at linuxtv.org
> >>>>>>>> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> >>>>>>>>
> >>>>>> I select them with Kaffeine. Hi/low and H/V doesn't matter. I
> >>>>>> tried upgrading to Kaffeine 0.8.5 but that doesn't make a
> >>>>>> difference. The "scan" application has the same issues.
> >>>>>>
> >>>>>> _______________________________________________
> >>>>>> linux-dvb mailing list
> >>>>>> linux-dvb at linuxtv.org
> >>>>>> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> >>>>>>
> >>>>>>
> >>>>> Nobody any ideas? If not, does anybody have some idea what the
> >>>>> difference between position 1+2, pos 3 and pos 4 could be? I was
> >>>>> thinking 1 and 2 might be working because of toneburst, but I don't
> >>>>> think Kaffeine uses such a signal and that doesn't explain why pos
> >>>>> 3 works if first tuning to 1 or 2 and 4 doesn't work at all.
> >>>>>
> >>>>>
> >>>> I've figured out a bit more. If I tune directly to postion 3, I get pos
> >>>> 1. Whenever I tune to pos 4, I get pos 2.
> >>>>
> >>>> I'll also ask people from Kaffeine as I'm not sure if the problem is
> >>>> in the application, driver or somewhere else.
> >>>>
> >>>> _______________________________________________
> >>>> linux-dvb mailing list
> >>>> linux-dvb at linuxtv.org
> >>>> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> >>>>
> >>> Hi,
> >>>
> >>> Strange scenario. You're not saying anything about input types and
> >>> the switch type. Are you sure that are properly connected ? How the
> >>> switch inputs are marked and from where you got the input signals ?
> >>> Please elaborate, if you want a proper answer.
> >>> I suggest to play with 'scandvb' from dvb-apps package instead of
> >>> Kaffeine. Look into scanning results if the scanned channels match
> >>> with what you wished to have on those positions.
> >>>
> >>>
> >> Hi,
> >>
> >> What do you mean with input type?
> >>
> >> Anyway, this is my config:
> >>
> >> Visiosat Bisat G3C for 19.2/28.2/23.5 + Triax 54cm for Hotbird
> >> 4 quad LNBs
> >>
> >> Spaun SAR 411F:
> >> A = Astra 19.2
> >> B = Astra 28.2/Eurobird1
> >> C = Astra 23.5
> >> D = Hotbird
> >>
> >> Maximum 4/1:
> >> A = Astra 19.2
> >> B = Astra 28.2/Eurobird1
> >> C = Astra 23.5
> >> D = Hotbird
> >>
> >> All works fine on a standalone so it is connected correctly.
> >>
> >> _______________________________________________
> >> linux-dvb mailing list
> >> linux-dvb at linuxtv.org
> >> http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
> >>
> > Hi,
> >
> > Ok, If I understood you correctly, you're talking about only plain
> > DiSEqC switch, with no polarity/tone management. Polarity and tone
> > switching are done by LNB's.
> > Recently, I found a branded switch, which was unable to decode a DiSEqC
> > commands while polarity was on horizontal (18V).
> > Maybe is the same situation, maybe not. That's why I asked you to check
> > the polarity/tone settings of the channels while switching to a
> > different channel on a different satellite.
> >
>
>
> That's right, no multiswitches or something like that. The last time I
> checked (a while ago), the Spaun was still completely working on my
> standalones. But as I figured out yesterday, something is wrong with
> that now. The standalones don't see D (Hotbird) anymore either. So I'm
> first going to fix that.
>
> Trying to switch from Flaunt (V) to 4fun.tv (V) doesn't work either, so
> it's not the same problem I guess.
>
>
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>
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