[linux-dvb] DiSEqC trouble with TT S-1500

Doru Marin Doru.Marin at Deuromedia.ro
Wed Feb 20 10:48:32 CET 2008


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.




More information about the linux-dvb mailing list