Optus D1, Optus D2 - same dish - two tellys....polarity problems.

Forums › Freeview (DVB-T/DVB-S) › Optus D1, Optus D2 - same dish - two tellys....polarity problems.

davidcole

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#105099 27-Jun-2012 10:40

Hi

Not strictly freeview, but related to DVB-S. Trying to diagnose, fix a problem for my Mother in law.

She has an 80cm dish on her house with a special Dual LNB rig that takes a feed from Optus D1 for Freeview channels and Optus D2 for the foreign content channels. Specifically she wants the ERT Greek channel. I mention this one specifically as I think it's Horizontal polarity (where as freeview is vertical - reverse these if needed, the point is ERT is different polarity to freeview).

Now she has a telly in the lounge with a STB that receives both satellites no problems.

She has a 2nd telly in the bedroom with it's own STB, and I understand there's a box (possibly a diseqc switch) that was supposed to allow both satellites in the bedroom. The problem is all she receives in the bedroom is the ERT, a freeview channel shows a blank screen.

I'm about ready to give up on using satellite for freeview and get her to buy a Freeview Capable TV (get an aerial installed etc) and reduce the lounge STB to ONLY the optus D2 feed.

Couple of questions:
Should the original setup be working? There may be two cables coming from the dish to the house. What could possibly be wrong?
If the lounge was using UHF for Freeview and STB for ERT, would the bedroom now magically get freeview and ERT (by the fact that it is the sole device now setting the polarity? Essentially it would be the reverse of what is happening now)

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xarqi

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#646880 27-Jun-2012 10:47

The feeds from the LNBs need to go to a multiswitch, and from there to each of the STBs. Either STB could then access either polarity without interfering with the other. Multiswitches are not expensive, the simple ones don't need power, and they are easy to fit, and operation is essentially automatic and transparent.

P.S.
Hmm - now I reread your post, and my reply, I'm not sure I've got to grips with your problem. Sorry. Somebody who knows what they are talking about will be along soon!

davidcole

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#646881 27-Jun-2012 10:50

xarqi: The feeds from the LNBs need to go to a multiswitch, and from there to each of the STBs. Either STB could then access either polarity without interfering with the other. Multiswitches are not expensive, the simple ones don't need power, and they are easy to fit, and operation is essentially automatic and transparent.

What is the current wiring configuration though?

I think it's a cable from each LNB to the multi switch, then a cable to each STB - is that how it should be set up?

It's been done by an installer, but I'm finding getting hold of him hard work.

grolschie

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#646882 27-Jun-2012 10:50

I am not really sure about the DiSEQC arrangement, sorry. Does the bedroom STB have the correct LNB and DiSEQC settings? I am pretty sure our switch has 4 ports and you need to select the correct one for each satellite in the STB.

You might need to re-tune ERT in the near future. UBI have gone into voluntary administration and hopefully the channel will return to Globecast on D2.

davidcole

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#646908 27-Jun-2012 11:24

grolschie: I am not really sure about the DiSEQC arrangement, sorry. Does the bedroom STB have the correct LNB and DiSEQC settings? I am pretty sure our switch has 4 ports and you need to select the correct one for each satellite in the STB.

You might need to re-tune ERT in the near future. UBI have gone into voluntary administration and hopefully the channel will return to Globecast on D2.

Oh, I had to rescan both tellys the other day as channels had moved, changed. I wish there was notification from somewhere.

silverlake

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#646916 27-Jun-2012 11:52

We need to know a bit more about the box you refer to. Is it a DiSeqC Switch or is it a multi switch?
Hopefully it is a multiswitch because the freeview channels are on D1 horizontal and D2 has a lot of channels on vertical.

Assuming that you've got a multiswitch that services STB's providing input from a horizontal LNB when supplied with a 17/18v current or input from a vertical LNB when supplied with a 13/14v input, then you should be able to access D1 Freeview channels in one room and D2 vertical channels in the other room simultaneously.

If it is a multiswitch as described, then you need to check that the LNB pointing at D1 is attached to the Horizontal port on the multiswitch and that the LNB pointing at D2 is attached to the vertical port on the multiswitch (try changing them round if you aren't sure).

There are some channels broadcast on a couple of horizontal transponders on D2 that you would be unable to receive with this configuration. The channels on D2 are mostly foreign language or religious, so you would have to decide if that is a problem.

davidcole

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#646919 27-Jun-2012 11:57

silverlake: We need to know a bit more about the box you refer to. Is it a DiSeqC Switch or is it a multi switch?
Hopefully it is a multiswitch because the freeview channels are on D1 horizontal and D2 has a lot of channels on vertical.

Assuming that you've got a multiswitch that services STB's providing input from a horizontal LNB when supplied with a 17/18v current or input from a vertical LNB when supplied with a 13/14v input, then you should be able to access D1 Freeview channels in one room and D2 vertical channels in the other room simultaneously.

If it is a multiswitch as described, then you need to check that the LNB pointing at D1 is attached to the Horizontal port on the multiswitch and that the LNB pointing at D2 is attached to the vertical port on the multiswitch (try changing them round if you aren't sure).

There are some channels broadcast on a couple of horizontal transponders on D2 that you would be unable to receive with this configuration. The channels on D2 are mostly foreign language or religious, so you would have to decide if that is a problem.

I'll have to look at it and try and figure out what it is. I didn't realise there were two different types of box. I'm fairly good on DVB - but not all of it.

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#646923 27-Jun-2012 12:07

Yeah as stated, need to know if its a Disq or If its just a multiplex/splitter, http://image.made-in-china.com/2f0j00FvgEzMuCAibn/SAT-CATV-Splitter-4-Way-.jpg

If its the latter You'll have to check the voltage flow on the legs.

Might find that as noted, the horizontal is only being sent to 1 of the legs so the primary STB will over-ride all.

Similar can happen with the 22khz tone I understand.

RunningMan

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#647016 27-Jun-2012 14:19

I think the root problem may be the LNB - a while ago there were a handle of dual throat D1/D2 LNBs kicking about with only a single output on them - if that is what you have, then you will only get one sat at a time.

To help clarify, can you post a photo of the LNB, and the switch box so we can see exactly what you have.

silverlake

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#647035 27-Jun-2012 15:00

ERT World is on Optus D2 12608 Horizontal. The freeview transponders on D1 are also all horizontal, so the multiswitch solution described earlier would not work for you. This means that your box will need to be a DiSeqc box.

Again, we need to know more about the box... how many LNB's and how many STB's does it support?
Given that it is a DiSeqc box, then we need to check the DiSeqc settings on each STB, and verify that there are no 22khz switches on.

silverlake

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#647829 28-Jun-2012 21:01

Another way to solve this;
Throw away your mystery box
By a multiswitch similar to this ($25): http://www.trademe.co.nz/electronics-photography/tvs/satellite-receivers/auction-487223927.htm
Climb on your roof and rotate the D2 LNB through 90 degrees so that horizontal becomes vertical and vertical becomes horizontal.
Connect the cable from the D2 LNB to the vertical port on the multiswitch.
Connect the cable from the D1 LNB to the horizontal port on the multiswitch.
Connect the cables from your STB's to the RX ports on the multiswitch.
On each STB perform a blind scan, or setup a transponder at 12608 Vertical SR 22500 and scan the transponder.
(Make sure all Diseqc and 22khz switches are off).

davidcole

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#647836 28-Jun-2012 21:10

So I managed to take some pictures....here's teh mystery box: http://www.flickr.com/photos/dcole66/7452858538/in/photostream
2nd one of the multiswitch showing where teh cables are connected: http://www.flickr.com/photos/dcole66/7452859998/in/photostream/

Then this is there as well: http://www.flickr.com/photos/dcole66/7452857098/in/photostream/

The dish looks like this (sorry it was getting dark)
http://www.flickr.com/photos/dcole66/7452861090/in/photostream/

How it's all connected I'd have to trace the cables but it was getting late, and I'd pulled the tv out from the wall.

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silverlake

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#647874 28-Jun-2012 21:55

davidcole: So I managed to take some pictures....here's teh mystery box: http://www.flickr.com/photos/dcole66/7452858538/in/photostream
2nd one of the multiswitch showing where teh cables are connected: http://www.flickr.com/photos/dcole66/7452859998/in/photostream/

Then this is there as well: http://www.flickr.com/photos/dcole66/7452857098/in/photostream/

The dish looks like this (sorry it was getting dark)
http://www.flickr.com/photos/dcole66/7452861090/in/photostream/

How it's all connected I'd have to trace the cables but it was getting late, and I'd pulled the tv out from the wall.

It appears from photo 7452861090 that there are 2 cables coming from a single LNB unit. Is this a dual LNB pointing at a single satellite (perhaps D2 so that you can get H and V from d2)?
There also appears to be something else behind the arm. Is this the second LNB pointing at D1?
There are 3 cables attached to the left side of the multi-switch, are they;
18v/22khz attached to a cable from the dual LNB (D2)?
13v/22khz attached to a cable from the dual LNB (D2)?
13v/0khz attached to a cable from the single LNB (D1)?

Where has the black cable going into the splitter come from and where do the 2 white cables coming out of the splitter go?

dtvs

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#647917 28-Jun-2012 23:13

Hi,

To make your receivers work correctly you need to have:

1) 2 x Twin LNBs (Two outputs). One LNB pointed to Optus D1, the other to Optus D2.

2) You have a MatchMaster Multiswitch which will allow four inputs as follows:

a) Horizontal with 22KHz on

b) Vertical with 22 KHz on

c) Horizontal with 22KHz off

d) Vertical with 22KHz off

3) Connect each of the outputs from Optus D2 LNB to (a) & (b) above

4) Connect each of the outputs from Optus D1 LNB to (c) & (d) above

5) With the Multiswitch you have, you can feed to up to 8 set top boxes. Looks like port1 & port2 are going to your receivers.

6) On all your receivers under LNB/Dish settings, set the 22Khz to OFF for Optus D1 satellite and ON for Optus D2.
7) If you have an external power supply feeding power to the Multiswitch, please make sure if will feed 18V. If the power supply is 14V, then remove it and use the receivers to feed the power to the LNB.

This should work.

Cheers

AH

illicit

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#647978 29-Jun-2012 08:22

Just to clarify the above, you don't need 2x twin LNBs - just one.
Optus D1 (Freeview) doesn't have anything useful on vertical (13v), so its not needed.

silverlake

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#648884 1-Jul-2012 09:18

So hopefully all the cabling is sorted out. In which case the STB settings must match the cabling configuration.
All DiSeqc settings should be off.
We are assuming that D2 has the 22khz switch on, and D1 has the 22khz switch off.