Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

16 posts


Topic # 88474 17-Aug-2011 00:25
Send private message

Hi all,

I've finally got my computer hooked up with a Hauppauge Nova-S USB2 device and I can pickup 7 SBS channels including SBS HD (using either WinTV or nPVR) with the following satellite settings:

Scan type: Single LNB
Optus D1 160E satellite
LOF1: 10750
Switch: 0
LOF2: 10750

I haven't managed to get up to the roof to check out the LNB info but I think the sat was installed in the last 3-5 years so I'm assuming it's dual LNB.  I assume it is a SKY dish.

Is anyone able to tell me how I might get Freeview channels?  Why can I only see the SBS ones, it's almost as if the device is looking on the Optus C1 but I've tried numerous times on D1.

Is there some scan software that I can use to do a blind scan?



View this topic in a long page with up to 500 replies per page Create new topic
 1 | 2
1598 posts

Uber Geek
Inactive user

  Reply # 507647 17-Aug-2011 00:32
Send private message

Freeview|Satellite was down recently. There were a number of posts about it, have a search up the top.

1574 posts

Uber Geek
+1 received by user: 11

  Reply # 507771 17-Aug-2011 10:43
Send private message

Keep in mind that Satellite Freeview is Horizontal polarization, and the SBS channels are Vertical polarization. You can only view one polarization at a time.

You say that you have a dual-lnb, do you also have two satellite coax cables/connections at your wall?

16 posts


  Reply # 507847 17-Aug-2011 12:23
Send private message

I'll try and get to the satellite to read the LNB details tonight, but it looks oval shaped from the ground. ?It only has one outlet at the wall, a typical tv reception connection (belling lee?).

How can I change to scan a horizontal pole? ?I've been using WinTV v7 and nPVR to scan, and nPVR appears to be scanning horizontal and vertical on the 22500 SR (which SHOULD get the NZ Freeview channels) and 11600 SR (which gets the SBS channels)...

I also can't get Win Media Centre to recognise my Nova-S USB2 tuner....

1574 posts

Uber Geek
+1 received by user: 11

  Reply # 507884 17-Aug-2011 13:10
Send private message

Probably what you have is a standard 65cm sky dish. This dish will have a dual LNB of sorts.
I think the dual LNB (the oval one you have) on the sky dishes are used as more of a backup just in-case one satellite goes missing.

The main LNB inside the oval LNB is set to point at Optus D1, and if there is a problem with the sky feeds on D1, I think they can shift over to the other LNB which is slightly offset, therefore pointing at another satellite. Or at least I think that's how it works.

So even though you essentially have two LNBs, you are really only able to access one at a time. Actually, that may not entirely be true. You may be able to access the other side of the dual LNB using a 22KHz tone or similar, but it would be of no use because it will always be pointing at the wrong satellite. Freeview and SBS are on the same satellite, but on different polarities.

To further explain polarities.
Polarization is implemented to allow for more channels to be beamed down to earth. Most LNBs will allow for polarity switching, and this is done by feeding a different voltage from the satellite receiver to the LNB.
13volts for Vertical (SBS)
17volts for Horizontal (Freeview)

Polarity switching is actually a physical process (well, actually... semi-physical really) inside the LNB, so if the LNB is receiving 13volts, it will physically be in the Vertical position. If it is receiving 17volts it will physically be in the Horizontal position. If you start feeding two different voltages to one LNB, through one cable, that's when things start to not work.

Ultimately, with your current situation you can only watch/record either Freeview or SBS separately, but not both at the same time.

16 posts


  Reply # 508103 17-Aug-2011 17:02
Send private message

Thanks for that info!   So to the crux of the issue then....Do I need to go up to the SKY dish and swap a power lead or a button or something to switch it to 17v supply?

Or will I need to get a new LNB?  

I'm a bit surprised, as I am watching nPVR scan through the horiz polarity freq's but it's certainly not seeing them....


727 posts

Ultimate Geek
+1 received by user: 7

  Reply # 508108 17-Aug-2011 17:10
Send private message

The receiver will send the appropriate voltage to the LNB depending on which service is being selected, and that will cause the LNB to switch to the required polarity. You should not need to (in fact it is not possible to) change anything on the LNB. Your issue has me puzzled, but I'm no expert so that's no big surprise.

1574 posts

Uber Geek
+1 received by user: 11

  Reply # 508112 17-Aug-2011 17:17
Send private message

It sounds like the LNB could be broken, and therefore stuck on vertical polarity. It can happen.
Your satellite tuner card will automatically provide the LNB with the correct voltage depending on the channel you are accessing.

To be sure, you could try testing the voltage that comes out of the tuner card with a multimeter to check that the tuner card is actually outputting the correct voltage. Or better yet, if you have access to another satellite receiver, hook it up and see if that can get freeview.

It could also be that there may be too much cable in the run up to the dish, which might be dropping the voltage too much. Or maybe the cable has become damaged recently. All possibilities, but the best thing to do would be to see if you can test with another receiver box/card, and check the voltage coming out of the satellite receiver.


16 posts


  Reply # 508146 17-Aug-2011 18:16
Send private message

Thanks for the help.  I've been up to check the dish - it's a Sharp Ku-LNBF dual dohickey, exactly like the example photo below. 


If it was used for SKY channels, then I guess the horizontal polarity was working at some stage right?

I'll try beg borrow or steal a sky box.....or a Dick S. borrow ;-)   


16 posts


  Reply # 508149 17-Aug-2011 18:17
Send private message

Make that a freeview box to get rather...

1574 posts

Uber Geek
+1 received by user: 11

  Reply # 508163 17-Aug-2011 18:32
Send private message

If you figure out that first LNB is the problem, the other side of the LNB might still be alright.
If you feel adventurous enough, you might be able to shift the other side into the centre of the satellite and hook up the other side. Or if it doesn't have a second physical connection for the other side you may be able to access the other LNB with a tone or SR setting on your tuner.

2001 posts

Uber Geek
+1 received by user: 159


  Reply # 508168 17-Aug-2011 18:44
Send private message

I'd look at replacing the LNB. I've just moved house and the Sky Sharp Quad output LNB could do SBS but had major issues with freeview. I got a replacement bracket and LNB from

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.

4 posts

Wannabe Geek

  Reply # 508915 19-Aug-2011 11:33
Send private message

I have the same problem 

can only get TP 12648 Vertical

and no other TP's at all

is this fixible or to I need a new LNB unit? 

16 posts


  Reply # 509500 21-Aug-2011 00:27
Send private message

Ok, just to update: 

I picked up a freeview set top box, and tried that out but no luck - didn't even get the SBS channels that I could get on my computer, but the scanning only takes about 3 seconds so maybe something's amiss there?

So, STB failing, I got a new LNB and replaced the old sky one, just got my mate to keep clicking scan on the STB while I held the LNB in approximately the old LNB position.  STILL no channels at all.

At this point, I'm flummoxed!  This thorny little issue has destroyed my confidence in 'the simplicity of freeview and satellite dish's'.

I'm assuming that there's a problem with the cabling from my dish to my wall outlet, or it's something else that I've completely missed.  Either way, I'm probably going to get an expert on to it.

....after I run a multimeter over the voltages in the cabling of course ;-)

cheers guys, any tips to add? 

553 posts

Ultimate Geek
+1 received by user: 15

  Reply # 509551 21-Aug-2011 10:46
Send private message

Pay a professional for half an hour to check out if the LNB is working correctly.

$40ish = problem solving done.

16 posts


  Reply # 510209 22-Aug-2011 22:59
Send private message

Final Update:

Problem solved by a professional: cost=$50.

He brought around his own STB and it worked perfectly, with 80% min strength.

So the problem was.... Sommet Freeview STB from Dick Smith for $99. Piece of crap.
The technician said he'd seen a few of these lately, and one lady took hers back and was given another one that also didn't work.  The one I got from DSE had been opened, so perhaps they're just handing on the returns grr.

The other problem for me is that the Hauppauge Nova-S USB2 tv tuner doesn't work properly.  I can still pickup the SBS channels but no sign of the NZ freeview channels.  So, only vertical polarity is working somehow.

Not sure if I want to try another one of these devices....I wonder if there's any better tv tuner cards for satellite?

Thanks for input guys 

 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 »

Intel introduces new NUC kits and NUC mini PCs
Posted 16-Aug-2018 11:03

The Warehouse leaps into the AI future with Google
Posted 15-Aug-2018 17:56

Targus set sights on enterprise and consumer growth in New Zealand
Posted 13-Aug-2018 13:47

Huawei to distribute nova 3i in New Zealand
Posted 9-Aug-2018 16:23

Home robot Vector to be available in New Zealand stores
Posted 9-Aug-2018 14:47

Panasonic announces new 2018 OLED TV line up
Posted 7-Aug-2018 16:38

Kordia completes first live 4K TV broadcast
Posted 1-Aug-2018 13:00

Schools get safer and smarter internet with Managed Network Upgrade
Posted 30-Jul-2018 20:01

DNC wants a safer .nz in the coming year
Posted 26-Jul-2018 16:08

Auldhouse becomes an AWS Authorised Training Delivery Partner in New Zealand
Posted 26-Jul-2018 15:55

Rakuten Kobo launches Kobo Clara HD entry level reader
Posted 26-Jul-2018 15:44

Kiwi team reaches semi-finals at the Microsoft Imagine Cup
Posted 26-Jul-2018 15:38

KidsCan App to Help Kiwi Children in Need
Posted 26-Jul-2018 15:32

FUJIFILM announces new high-performance lenses
Posted 24-Jul-2018 14:57

New FUJIFILM XF10 introduces square mode for Instagram sharing
Posted 24-Jul-2018 14:44

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.