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80 posts

Master Geek


Topic # 74414 29-Dec-2010 19:41
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Today I am experiencing signal loss similar to rain fade. I am in West Auckland and it's a glorious day ( I know, why am I home).

I read somewhere that it is possible for this to happen due to thermal waves?? from a tin roof? is this possible, as my dish points directly across the top of my neighbours tin roof. I can't remember it happening last summer.

The signal will come back, and work for a few seconds up to a minute or 2 then pixellate or freeze and then I get the no signal message.

It is a Windows 7 Media Centre PC.


Cheers

Stuart

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  Reply # 422471 29-Dec-2010 21:08
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I'm getting similar loss of signal here in hamilton. Dvb-t here though. Started about 30 minutes ago. Happens across all channels.

Sent from my Samsung Captivate.




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Master Geek


  Reply # 422500 29-Dec-2010 21:59
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Interesting that DVB-T and DVB-S would do the same, when mine does work the Satellite is a whole advert behind real time tv.

 
 
 
 


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  Reply # 422502 29-Dec-2010 22:03
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my issues seem to have stopped. i was getting signal loss around every 5 or 10 minutes. i wonder if our issues are related? cant imagine dvb-s and dvb-t will both experience issues unless it's from the source..

no one else has commented so must assume we are concidently having unrelated issues at the same time.




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- Business Hours - Work In The Electricity Industry, After Hours - DJ/Turntablist - Will Scratch Vinyl For Free'
- What's next??? S3?



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Master Geek


  Reply # 422512 29-Dec-2010 22:25
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mine are still ongoing

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  Reply # 422524 29-Dec-2010 22:54
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A few have reported older LNB's starting to fail by drifting a little as they get hotter. DVB-S problem only obviously but could explain the initial posting problem perhaps?



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Master Geek


  Reply # 422591 30-Dec-2010 10:37
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Hi Jaxson, how do I test for that. I was thinking of taking my Media PC to my mates and plugging it into his dish and see what happens, then would it be a case of getting dish alignment checked and lnb checked by someone. It is still the same this morning and its a wee bit cooler now and no sun?



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Master Geek


  Reply # 422673 30-Dec-2010 17:40
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Ok. took my media center pc to mates and plugged in his sky dish and it worked fine. So i guess it is either my dish alignment or lnb failure. is there anyone in west auckland avaialable to have a look for me?? What would it cost? 

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  Reply # 422675 30-Dec-2010 17:54
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It's pretty easy to check the alignment if you can reach the dish easily - they can get moved around by the wind over time.

If you are able to move the dish a few mm left / right / up / down and see if the signal improves, then it's usually pretty easy to loosen the mounting bolts and re-align it. You could also try altering the skew (rotation) of the LNB slightly.

The other common failure is the LNB itself starts going bad with temperature fluctuations - only cure is to replace it.



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Master Geek


  Reply # 422713 30-Dec-2010 19:30
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How long do you need o hold the dish in a new positions, cos I tried that, and it kinda worked, but i was only persone home and was going by the sound levels I could hear!! :-)

How much is an LNB?

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  Reply # 422727 30-Dec-2010 19:53
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You usually need to hold it for several seconds for the signal to stabilise - far easier if you can either see the TV or have 2 people.

Some STBs do have an audible signal strength meter which is quite handy from on the roof!

If you have 2 people though, and 1 can call out the signal strength, while the other is on the roof, that would be fine - just be prepared to overshoot a couple of times Tongue out

LNBs, depends on what you need. Could be anywhere from $10 second hand to over $100 for dual/multi output models...



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Master Geek


  Reply # 422762 30-Dec-2010 21:10
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Thanks RunningMan,

The dish is just below the 1st floor deck, about 15 feet from the TV but round a corner out of sight. We will give that a go. Do not know what an STB is. It is an old Sky dish with a dual 10750 lnb ?? does that sound right?

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  Reply # 422783 30-Dec-2010 22:05
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Sorry, STB = Set Top Box - standalone sat receiver.... Not sure what your PC has in the way of a signal meter though...



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Master Geek


  Reply # 422786 30-Dec-2010 22:17
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I have just a home built pc with Windows 7 and a Hauppaugge Nova-S Plus card and Media Centre, been running fine for  a year or so!

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  Reply # 423313 2-Jan-2011 07:37
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How did you go with the alignment?

Found this on TradeMe - it may be the one you are looking for of you need a new one...

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  Reply # 423621 3-Jan-2011 08:40
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I'm 99.9% positive thats its the LNB - the dual throat (oval head) Sky 10750 LNB's have problems with heat (as mentioned already).

You have caused yourself more grief by moving the dish - 9/10 times; dish alignment isn't the issue - but it is now that you've moved it.

Interim fix would be to set your frequencies around 3-4 higher - ie: 12459 instead of 12456.
That would have sufficed until you have the LNB replaced (preferably by an installer - so they can realign the dish accurately with a proper meter).

I recommend a good quality LNB (such as the Strong brand), not a trademe cheapie; there is a significant difference

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