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.


7 posts

Wannabe Geek


Topic # 85954 28-Jun-2011 19:06
Send private message

Hello all,

I have sky hdi decoder and a Superview 380 freeview decoder which I bought especially to view SBS.
I have screwed the satellite cable into a 4 way splitter. The problem being although sky and the nz freeview channels work fine, I do not have a signal for SBS. If I disconnect the cable to sky, or if I unplug the power for the sky box I do have a picture on SBS. If I just turn the sky box off I do not get a sbs signal.
I understand that sky and sbs both use the horizontal polarisation from trolling through the forums.
Is there a solution out there? If it is impossible to have this set up on the same tv can the freeview box be connected to another tv which would then allow me to to view SBS and where would the splitter be positioned?
Thanks for any help.
Al

Create new topic
4223 posts

Uber Geek
+1 received by user: 67

Moderator
Trusted
Lifetime subscriber

  Reply # 487067 28-Jun-2011 19:10
Send private message

What kind of splitter are you using? What are both boxes providing power to the lnb? (They should not be)

1154 posts

Uber Geek
+1 received by user: 141

Trusted
Subscriber

  Reply # 487073 28-Jun-2011 19:21
Send private message

The SBS channels we can pick up are vertical, so, you can't have Sky and SBS running at the same time normally without seperate coax lines and a dual output lnb I thought.



7 posts

Wannabe Geek


  Reply # 487076 28-Jun-2011 19:26
Send private message

Antsig 4 way F-connector splitter AP144 bought at Mitre10.
I didn't understand the question regarding the lnb. I'm using the splitter inside if that helps.

423 posts

Ultimate Geek
+1 received by user: 8


  Reply # 487080 28-Jun-2011 19:31
Send private message

al27: I understand that sky and sbs both use the horizontal polarisation from trolling through the forums.


That's incorrect.

Sky and Freeview use horizontal polarisation, SBS uses vertical.

Your Sky box is sending your LNB an 18V signal for horizontal, and your Superview is sending a 13V signal for vertical for SBS. The 18V signal overrides the 13V signal.

If you want them both to work independently, you'll need to install a dual-output LNB.

1904 posts

Uber Geek
+1 received by user: 287

Trusted

  Reply # 487083 28-Jun-2011 19:38
Send private message

michaelt:
al27: I understand that sky and sbs both use the horizontal polarisation from trolling through the forums.


That's incorrect.

Sky and Freeview use horizontal polarisation, SBS uses vertical.

Your Sky box is sending your LNB an 18V signal for horizontal, and your Superview is sending a 13V signal for vertical for SBS. The 18V signal overrides the 13V signal.

If you want them both to work independently, you'll need to install a dual-output LNB.

+1



7 posts

Wannabe Geek


  Reply # 487085 28-Jun-2011 19:41
Send private message

Does anyone know if sky can provide the dual lnb? I ask as they've changed mine a couple of times over the years, and do you still use just the 1 coaxial cable or required to run an extra cable?
Thanks

1961 posts

Uber Geek
+1 received by user: 313

Lifetime subscriber

  Reply # 487089 28-Jun-2011 19:49
Send private message

Dual output implies two cable runs, one to each decoder. Can't work without two cable runs if you bother to think about it.




Ross

 

Spark FibreMAX using Mikrotik CCR1009-8G-1S-1S+

 


Speed Test




7 posts

Wannabe Geek


  Reply # 487093 28-Jun-2011 19:56
Send private message

Spyware: Dual output implies two cable runs, one to each decoder. Can't work without two cable runs if you bother to think about it.



It's all foreign to me how it works which is why I'm asking the experts. Thanks for your reply.



7 posts

Wannabe Geek


Reply # 487094 28-Jun-2011 19:58
Send private message

Thanks everyone for all your input. It has been most appreciated.

Regards, Al

147 posts

Master Geek
+1 received by user: 2


  Reply # 487132 28-Jun-2011 20:48
Send private message

Hi Al

In a nutshell, there are two probes inside the LNB (dual polarity) on your dish, a horizontal and a vertical. The signal for Sky and Freeview is transmitted on the horizontal axis, whereas the SBS signal is on a vertical beam. The receiver accesses either probe by sending power up the coax cable; 18 volts for the horizontal, 13 volts for the vertical. As long as 18 volts is present from the Sky box, 13 volts for SBS from the freeview box just doesn't get a look in.

The simple solution is to utilize a dual polarity, twin output LNB, such as this (http://www.trademe.co.nz/Browse/Listing.aspx?id=387908969) one.

You will need two cables to the dish and you can then supply your receivers fully independently with one cable to each.



7 posts

Wannabe Geek


  Reply # 487140 28-Jun-2011 21:03
Send private message

Thanks Paul, I did spy that one.
CheersSmile



7 posts

Wannabe Geek


  Reply # 489536 5-Jul-2011 09:54
Send private message

An update to all that replied or have a similar query.
I checked and found I have a quad output LNB on my dish already. (Sky have changed the LNB a couple of times over the years.)  After running the second cable I now have both sky and freeview sbs channels.


 

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 »

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


Enable doubles fibre broadband speeds for its most popular wholesale service in Christchurch
Posted 2-Jun-2018 20:07


All or Nothing: New Zealand All Blacks arrives on Amazon Prime Video
Posted 2-Jun-2018 16:21


Innovation Grant, High Tech Awards and new USA office for Kiwi tech company SwipedOn
Posted 1-Jun-2018 20:54


Commerce Commission warns Apple for misleading consumers about their rights
Posted 30-May-2018 13:15


IBM leads Call for Code to use cloud, data, AI, blockchain for natural disaster relief
Posted 25-May-2018 14:12


New FUJIFILM X-T100 aims to do better job than smartphones
Posted 24-May-2018 20:17


Stuff takes 100% ownership of Stuff Fibre
Posted 24-May-2018 19:41



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.