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
4154 posts

Uber Geek
+1 received by user: 54

Moderator
Trusted
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)

1108 posts

Uber Geek
+1 received by user: 118

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.

1824 posts

Uber Geek
+1 received by user: 232

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

1784 posts

Uber Geek
+1 received by user: 259

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 »

Mobile market competition issues ComCom should watch
Posted 18-Dec-2017 10:52


New Zealand government to create digital advisory group
Posted 16-Dec-2017 08:47


Australia datum changes means whole country moving 1.8 metres north-east
Posted 16-Dec-2017 08:39


UAV Traffic Management Trial launching today in New Zealand
Posted 12-Dec-2017 16:06


UFB connections pass 460,000
Posted 11-Dec-2017 11:26


The Warehouse Group to adopt IBM Cloud to support digital transformation
Posted 11-Dec-2017 11:22


Dimension Data peeks into digital business 2018
Posted 11-Dec-2017 10:55


2018 Cyber Security Predictions
Posted 7-Dec-2017 14:55


Global Govtech Accelerator to drive public sector innovation in Wellington
Posted 7-Dec-2017 11:21


Stuff Pix media strategy a new direction
Posted 7-Dec-2017 09:37


Digital transformation is dead
Posted 7-Dec-2017 09:31


Fake news and cyber security
Posted 7-Dec-2017 09:27


Dimension Data New Zealand strengthens cybersecurity practice
Posted 5-Dec-2017 20:27


Epson NZ launches new Expression Premium Photo range
Posted 5-Dec-2017 20:26


Eventbrite and Twickets launch integration partnership in Australia and New Zealand
Posted 5-Dec-2017 20:23



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.