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rossmcm

111 posts

Master Geek


#245139 20-Jan-2019 15:41

It's a long story.  A couple of years back, Sky set out to make sure customers who used their sky box in two locations were equipped with LNBs such that you didn't need to mess about with settings each time you moved the box. AFAIK we were running with dual throat LNBs at our Auckland address and our Northland beach house.  The box was set to a LO frequency of 11.3 and it worked fine.

 

This summer, however, the beach LNB fell victim to the fierce northern sun, and the local Sky man replaced it with another one, assuring the Ms that, we would not require any retuning when she bought the box back to Auckland.  On returning however I had to change the LO frequency from 10.75 to 11.3 in order to get it working.

 

Likewise, when we went up north again I had to set it to 10.75.

 

When we came back to Auckland this time, however, changing the LOF to 11.3 was needed (as expected) but channels 1, 2 and 3 (and only those channels) are pixelated - i.e. like rain fade.  I initially suspected sun outage but the problem is persistent.

 

I've messed with the settings a bit and think I might have improved things, but it's still not perfect.  Here's what I have ended up with:

 

 

 

And here's the signals stats:

 

 

Any suggestions as to what might not be correct (<mournful expression>) ?


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snnet
1401 posts

Uber Geek


  #2164309 20-Jan-2019 16:11
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If it isn't the lnb failing, do you know if your satellite feeds are split at all? it could be a faulty splitter, apparently you can lose 8db per leg on the splitter

 

I just had one where I had to replace the splitter with a DDA24 distributor unit as they bring each connection close to 0db loss (client was losing UKTV but only at night)

 

What are the connections like? 

 

Do you know if it's normal for Tuners 3 and 4 to  be unlocked and active like that? Every other box I've seen only has 1 and 2


 
 
 

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RunningMan
8215 posts

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  #2164321 20-Jan-2019 16:35
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The dual throat LNBs are 10,750, not 11,300.

 

That 6.3dB signal looks a bit low - is the dish aimed correctly? Could be the alignment is a bit out, or the skew has moved a little.


rossmcm

111 posts

Master Geek


  #2164342 20-Jan-2019 17:19

The LNB in Auckland was replaced by Sky some years back so it could be ion the way out.  When the one at the beach was drifting (squirting the LNB with a hose improved things!) I was able to fix it by tweaking the LOF.

 

I don't think the connections are the problem, as I would have expected the issue to affect all channels in that case (? speaking as a noob here).  Everything apart from Ch 1,2 and 3 is OK.

 

I'm interested to know the effect of the Transponder Frequency setting.  Originally it was set to 12.456 GHz, but I changed it to 12.519 (saw that value mentioned in posts) - seemed to make little difference.

 

I would have thought that the settings for a given satellite/LNB would be constant.  What would happen if I tried a reset to default settings?

 

 




Spyware
3334 posts

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  #2164346 20-Jan-2019 17:28
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Stop fiddling. It will be an alignment problem. Reason that 1,2,3 are affected is because they are on the transponders using 8PSK (with the other HD channels). The SD (low bitrate muck as I call them) channels use QPSK.


Brunzy
1963 posts

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  #2164393 20-Jan-2019 18:29
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11300’s are not that common for Sky, but at the risk of sounding boring why don’t you ring Sky, that’s what you pay them for.
It could be an alignment, and or an LNB issue , but whatever it is why don’t you get him to replace the LNB while he’s there and make them both the same.
Problem solved!

Brunzy
1963 posts

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  #2164395 20-Jan-2019 18:39
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snnet:

If it isn't the lnb failing, do you know if your satellite feeds are split at all? it could be a faulty splitter, apparently you can lose 8db per leg on the splitter


I just had one where I had to replace the splitter with a DDA24 distributor unit as they bring each connection close to 0db loss (client was losing UKTV but only at night)


What are the connections like? 


Do you know if it's normal for Tuners 3 and 4 to  be unlocked and active like that? Every other box I've seen only has 1 and 2



apparently you can lose 8db per leg on the splitter [b]
You do this for a living??

I just had one where I had to replace the splitter with a DDA24 distributor unit as they bring each connection close to 0db loss (client was losing UKTV but only at night)

Highly unlikely the splitter was the issue


rossmcm

111 posts

Master Geek


  #2164446 20-Jan-2019 21:05

I did call sky. Suggested I try 10.75 LOF (gave no signal at all). Finally scheduled a service call for tomorrow. In the meantime it has got into a state where it reports no channels available.




kiwifidget
"Cookie"
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  #2164474 20-Jan-2019 22:44
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This could be a long shot, but i had pixely probs with several but not all sky channels a few years ago.

 

Everything came right once I moved the cordless phone far enough away.





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Apsattv
2161 posts

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  #2164489 21-Jan-2019 00:21
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Probably alignment or lnbf gone bad. Those tuner readings should be reading 13-16dB

 

 


snnet
1401 posts

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  #2164506 21-Jan-2019 06:51
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Brunzy:
snnet:

 

If it isn't the lnb failing, do you know if your satellite feeds are split at all? it could be a faulty splitter, apparently you can lose 8db per leg on the splitter

 

 

 

I just had one where I had to replace the splitter with a DDA24 distributor unit as they bring each connection close to 0db loss (client was losing UKTV but only at night)

 

 

 

What are the connections like? 

 

 

 

Do you know if it's normal for Tuners 3 and 4 to  be unlocked and active like that? Every other box I've seen only has 1 and 2

 



apparently you can lose 8db per leg on the splitter [b]
You do this for a living??

I just had one where I had to replace the splitter with a DDA24 distributor unit as they bring each connection close to 0db loss (client was losing UKTV but only at night)

Highly unlikely the splitter was the issue

 

 

 

I'm not a total expert, I was asked if there was something I could do -- I was told what to do as I said in the post. I was simply throwing it out there as what I''d been told had fixed the issue in this case. The splitter loss may have been 8db overall, that's still a lot. My customer was losing UKTV only, and only at night, and what I had been told to do has fixed it in his case.


rossmcm

111 posts

Master Geek


  #2167124 24-Jan-2019 19:09

**** UPDATE ****

 

The Sky Man Cometh, and replaced the decoder, and it's been 100% since.  I wasn't home when he dropped by but apparently, he never went near the antenna.

 

 


snnet
1401 posts

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  #2167177 24-Jan-2019 20:46
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Awesome, good to know. I know how much they hate jumping to that conclusion!


Apsattv
2161 posts

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  #2167439 25-Jan-2019 14:25
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Can you post a followup image of your signal stats..

 

 


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