Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.
View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 


837 posts

Ultimate Geek
+1 received by user: 30


  Reply # 486176 26-Jun-2011 19:30
Send private message

illicit: Depends on the initial install - If done correctly, then no, it shouldn't move unless there is a tornado or something.

But lots of installs aren't done very well, sky installs are a common one - screwing the dish to the fascia/barge board instead of somewhere solid, allows flex in the mounting and over time can pull the fascia or barge board off.

like this....







Right, that makes sense. Ours is attached to the chimney, should be pretty solid. It must've moved in the last 2 years as that's when we moved in. I'm assuming the previous owners were using it ok as they had a tv and the install had left the sat dish the only conection in the house.

1991 posts

Uber Geek
+1 received by user: 155

Trusted

  Reply # 486210 26-Jun-2011 21:09
Send private message

I resolved my issues by swapping the Sharp Qual LNB for a decent one from freeviewshop.co.nz. They also provide brackets for adapting existing sky dishes to take LNBs.

I've now got perfect reception on SBS as well as freeview.




Generally known online as OpenMedia, now working for Red Hat New Zealand as a Solution Architect for all things Linux, Virtual and of course Cloud. Still playing with MythTV and digital media on the side.



837 posts

Ultimate Geek
+1 received by user: 30


  Reply # 486603 27-Jun-2011 21:47
Send private message

So I turned on the sat box again tonight to have a fiddle and now, One, 2, U, TVNZ7 are working fine. Seem to have Signal 80 and Quality 89 +/- I can't seem to tune in the other channels though, the 12456 MHz ones I believe. Just doing a bit of reading, is it possible that I may just need to twist the actual LNB a fraction and try that?

1068 posts

Uber Geek
+1 received by user: 55

Trusted

  Reply # 486621 27-Jun-2011 22:20
Send private message

Certainly, that is possible. There are 4 common adjustments you can make on a satellite dish:

1. Dish left or right.
2. Dish up or down.
3. LNB angle (AKA skew).
4. LNB in or out (closer to or further from the dish face).




837 posts

Ultimate Geek
+1 received by user: 30


  Reply # 486622 27-Jun-2011 22:23
Send private message

mm1352000: Certainly, that is possible. There are 4 common adjustments you can make on a satellite dish:

1. Dish left or right.
2. Dish up or down.
3. LNB angle (AKA skew).
4. LNB in or out (closer to or further from the dish face).



Right, is there any of the above that would be worth trying first given that half the channels work already?


1068 posts

Uber Geek
+1 received by user: 55

Trusted

  Reply # 486629 27-Jun-2011 22:36
Send private message

Definitely the last two. In some cases LNB skew adjustment can be critical to within 5 mm so make small adjustments.

147 posts

Master Geek
+1 received by user: 2


  Reply # 486693 28-Jun-2011 07:46
Send private message

if you can receive TV1 etc on 12483 Mhz then TV3 etc on 12456 Mhz should not be an issue. Skew of the LNB is unlikely to resolve your problem. I would first check that TV1 is actually being received on 12483 Mhz as it is more likely the LNB LO (local oscillator) has drifted off spec. Very common with Sky 10750 Mhz(LO) LNB's and is known to cause some issues such as you are experiencing.

6655 posts

Uber Geek
+1 received by user: 568

Trusted

  Reply # 486788 28-Jun-2011 11:20
Send private message

As above, what type of LNB have you got?  If it's an old ex SKY oval 10750 one then that may be your problem right there.

Re Skew optimising, a budget/rough way to help with this is to turn the lnb one way until it stops giving a picture.  Mark this point with a pen.  Then turn it back towards where it was and keep going in the other direction until you don't get a picture again.  Mark this point with a pen.  The optimum is roughly half way between the two points.  Using SBS as your target channel will help pinpoint this more accurately too.



837 posts

Ultimate Geek
+1 received by user: 30


  Reply # 487167 28-Jun-2011 22:00
Send private message

Yup, those channels on 12483. Yes it's one of those oval shaped 10750 Mhz LNBs.

Sounds like it's worth a go thanks Jaxson. I'll wait for some drier weather and get up there and give it a go.

147 posts

Master Geek
+1 received by user: 2


  Reply # 487190 28-Jun-2011 22:34
Send private message

If you do a manual scan at 12456Mhz, Horizontal, Symbol Rate 22500 and get nothing then you could try changing 12456 say 5 steps either way to 12451 or 12461 and see if you get anything then.

And while in that part of the setup menu try 12671 H, 22500 SR.

I can say with near certainty that it will not be your skew, otherwise you would not be getting TV1.

If nothing on any of those those frequencies then I would look closely at your cable runs and connections.

If you can get hold of a cable that you can run temporarily from dish to receiver then that can be a good start.



837 posts

Ultimate Geek
+1 received by user: 30


  Reply # 488682 2-Jul-2011 21:00
Send private message

I haven't had a chance to try the above solutions, but now channels 1,2,6,7 are being quite flakey. They were working fine up until last night and then it's patchy. Sometimes they will work and sometimes they don't. Does that sound like the LNB is dying? The wind has been blowing a bit today. Hmmmm



837 posts

Ultimate Geek
+1 received by user: 30


  Reply # 509918 22-Aug-2011 13:15
Send private message

kiwisat: If you do a manual scan at 12456Mhz, Horizontal, Symbol Rate 22500 and get nothing then you could try changing 12456 say 5 steps either way to 12451 or 12461 and see if you get anything then.

And while in that part of the setup menu try 12671 H, 22500 SR.

I can say with near certainty that it will not be your skew, otherwise you would not be getting TV1.

If nothing on any of those those frequencies then I would look closely at your cable runs and connections.

If you can get hold of a cable that you can run temporarily from dish to receiver then that can be a good start.


I forgot to update this, but the above did infact work. I used 12461 and added 5 to the other freq and now have all freeview channels tuned in. Why does this work? Is the LNB slightly off somehow? I'm hoping that I'll still be able to use DVB-S in a WMC.

4904 posts

Uber Geek
+1 received by user: 1538


  Reply # 509920 22-Aug-2011 13:24
Send private message

CutCutCut: I forgot to update this, but the above did infact work. I used 12461 and added 5 to the other freq and now have all freeview channels tuned in. Why does this work? Is the LNB slightly off somehow? I'm hoping that I'll still be able to use DVB-S in a WMC.


It means the LNB is dieing - the local oscillator (LO) frequency has changed slightly from it's specified value (probably 10750).



837 posts

Ultimate Geek
+1 received by user: 30


  Reply # 509939 22-Aug-2011 13:51
Send private message

Ahh I see. I wonder how long it will last...

1 | 2 
View this topic in a long page with up to 500 replies per page Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Hawaiki Transpacific cable ready-for-service
Posted 20-Jul-2018 11:29


Microsoft Dynamics 365 Business Central launches
Posted 10-Jul-2018 10:40


Spark completes first milestone in voice platform upgrade
Posted 10-Jul-2018 09:36


Microsoft ices heated developers
Posted 6-Jul-2018 20:16


PB Technologies charged for its extended warranties and warned for bait advertising
Posted 3-Jul-2018 15:45


Almost 20,000 people claim credits from Spark
Posted 29-Jun-2018 10:40


Cove sells NZ's first insurance policy via chatbot
Posted 25-Jun-2018 10:04


N4L helping TAKA Trust bridge the digital divide for Lower Hutt students
Posted 18-Jun-2018 13:08


Winners Announced for 2018 CIO Awards
Posted 18-Jun-2018 13:03


Logitech Rally sets new standard for USB-connected video conference cameras
Posted 18-Jun-2018 09:27


Russell Stanners steps down as Vodafone NZ CEO
Posted 12-Jun-2018 09:13


Intergen recognised as 2018 Microsoft Country Partner of the Year for New Zealand
Posted 12-Jun-2018 08:00


Finalists Announced For Microsoft NZ Partner Awards
Posted 6-Jun-2018 15:12


Vocus Group and Vodafone announce joint venture to accelerate fibre innovation
Posted 5-Jun-2018 10:52


Kogan.com to launch Kogan Mobile in New Zealand
Posted 4-Jun-2018 14:34



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.