SBS - Quality during the day vs late at night

Forums › Home Theatre (including HTPC and EPG Collector) › SBS - Quality during the day vs late at night

valtam

396 posts

Ultimate Geek

#64406 15-Jul-2010 01:10

As the topic is titled, during the day and early evening SBS1 - 4 and SBSHD is practically unwatchable. The image is garbled and patchy (video and audio) stuttering, the works! Each night starting from around 10pm onwards, the image gradually cleans up until now (1am) the quality is perfect on all of the SBS channels.

Does anyone else experience this and if so, why does this occur almost like clock work everyday - poor quality during the day and gradually improving throughout the night to the point where its fine.

The EPG is pretty unreliable to, sometimes its there, sometimes its not, but I guess thats another thread in the making ;)

Thanks :)

System is Windows 7 64bit.
Running MediaPortal 1.1.0 RC6.

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GeekGuy

593 posts

Ultimate Geek

#351671 15-Jul-2010 02:04

I dont have any problem (only rain fade) with SBS1 and SBS2, no matter what time of day or night. I am only using a Dick Smith Freeview tuner tuned to it ... mind you I didnt know you could get an EPG .

aucklander

477 posts

Ultimate Geek

#351707 15-Jul-2010 08:48

can anyone please confirm the skwe angle for the LNB used for SBS channels?
I have 98% quality on Optus D1 (freeview) but there is no signal at all when I change the tunning parameter to SBS. The LNB is installed a bit offset on a 90cm offset dish pointing at IS5 (BBC, Australia Network).

I tried rotating the LNB with no results at all. I might have to try and adjust the position as well even if the quality on Freeview will decrease a bit? It does not make sense, as the signals are coming from the same satelite... I feel the skwe angle needs improved... but I tried that as well, with no results.

Thank you.

mobo Intel DH55PJ, RAM: 4GB RAM, Nova-T 500 HD + Avermedia Trinity tuner card, Geforce 520 video, 120GB SSD Sandisk + 640 WD + 1000SG, Win7 Home Prem 64-bit, Media Portal 1.15.0; BTC 9019URF Cordless Keyboard, Panasonic 55" (HDMI cable), HTPC Case Silverstone Grandia GD05B.

allstarnz

1719 posts

Uber Geek

Trusted

#351721 15-Jul-2010 09:18

is that the only set top box plugged in to the dish? If you have any horizontal polarity channels (i.e. anything from Freeview or Sky) accessing channels from that dish, you will not be able to tune SBS.

The signals from SBS are much weaker than those from Sky. A 60cm dish will be quite marginal, especially once it starts getting a bit rainy.

valtam

396 posts

Ultimate Geek

#351876 15-Jul-2010 13:44

aucklander - you're probably better off starting a new thread for your enquiry. I am still looking for feedback from others that experience my specific situation, or those that have a solution. Cheers fellas.

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WaffleMakerMan

138 posts

Master Geek

#352811 17-Jul-2010 20:44

Probably something to do with the time of year and atmospheric condition day vs night.

Perhaps a bigger dish or amp could fix it, check your connections at the LNB, in the wall etc for contidion (corrosion etc)

valtam

396 posts

Ultimate Geek

#352847 17-Jul-2010 23:54

Thanks mate, dish is pretty old, was thinking about getting a bigger, newer one anyway :)

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aucklander

477 posts

Ultimate Geek

#353288 19-Jul-2010 11:18

Hi Valtam,

I have 90cm dish in good condition, new C band LNB and the same happens. Not a worry but the fluctuation is definetely there: 50% quality on IS5 in the evening, 65% in the morning. There are lots of articles on the net about the thermal noise generating this "anomaly", a larger dish willl help but the variation in signal quality apparently will be there all the time.

Warmer the ground (or the objects around the dish - like a roof), higher the "thermal noise". The location of the dish can be selected to minimise the effect of such external influences. That's what I found out so far.

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valtam

396 posts

Ultimate Geek

#353375 19-Jul-2010 13:31

Cheers for that info Aucklander :) I will research thermal noise further.

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