Freeview DVB-S lock problem with 12456 transponder (MythTv)

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mivilleb

27 posts

Geek

#59426 5-Apr-2010 22:18

I have a WinTV NOVA-S-Plus DVB-S card running with MythTv for Freeview and it has been working fine since I had the brand new dish installed in September 2009. The past 4-5 days I have not been able to get a continuous lock on the 12456 Freeview Transponder (TV3, C4, etc.). I am able to view the channels on the 12483 transponder (TV-ONE, TV2, etc.) and I am even able to get a lock on the Sky-TV transponders (12394, 12421, 12519 and 12581 and many others).

I have not changed anything to my setup for MythTV. My signal strength is 96% in the Upper Hutt area near Wellington.

Transponder 21: Sometime I get a lock but it is intermittent. Most of the time I can not get a lock.
- Frequency: 12456000
- SR: 22500000
- Polarity: Horizontal

Transponder 22: Works fine.
- Frequency: 12483000
- SR: 22500000
- Polarity: Horizontal

Anybody has the same problem?

Any idea what the problem could be? (DVB-S card, MythTV or the dish?)

Since I can get a lock on all the ohter transponders, I assume it is not a problem with my DVB-S card or dish. Is there a way to find out if there is a problem with Optus D1 (any status web page somewhere), I imagined we would have heard about it!

Any help would be appreciated.

Bernard

nzsouthernman

44 posts

Geek

#315154 5-Apr-2010 23:20

Hiya.

Try rerunning your channel scan. If you haven't got multirecording set up, bump your encoders up to three or four and remove & rescan the canwest transponder. That sorted it for me once.

If that doesn't work pm me and I'll stick a monitor onto my mythbackend and check which DVB-S setting I used for the initial LNB setup. It took me a while of trial and error to get that right.

Which myth variant are you using?

-------------------------------------
One day, your uppance will come
- Stewie Griffin

Smith & Wesson, pioneers of the
'Point & Click' interface
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mivilleb

27 posts

Geek

#315282 6-Apr-2010 12:20

That is what I was doing, rerunning channel scan, that is where I noticed that it was not locking for the 12456 transponder. At least sometimes it locks, but most of the time it does not. So trying to record something, just does not work when you do not have a lock. I have not changed anything to my setting since I installed MythTv and is has always worked, it is just the past 4-5 days that it started, like something has changed with the satellite/transponder.

openmedia

3449 posts

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+1 received by user: 878

Trusted

#315293 6-Apr-2010 13:00

You need to check the skew on your LNB as there is a chance it has moved in the wind. If its slightly off you can have unpredictable reception.

Generally known online as OpenMedia, now working for Red Hat APAC as a Technology Evangelist and Portfolio Architect. Still playing with MythTV and digital media on the side.

felixfurtak

36 posts

Geek
+1 received by user: 8

#322692 25-Apr-2010 15:57

Yep, same issue here with 12456Mhz transponder. Using Nova-s plus and Mythtv on Ubuntu lucid (release candidate)

It used to be rock solid and nothing has really changed hardware-wise.

12483MHz is fine.

Maybe they have reduced power?

openmedia

3449 posts

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+1 received by user: 878

Trusted

#322850 26-Apr-2010 00:01

Might be your LNB is getting a bit old. I had 3 fail me within a couple of months the other year as I run a Toroidal with multiple satellites,

Generally known online as OpenMedia, now working for Red Hat APAC as a Technology Evangelist and Portfolio Architect. Still playing with MythTV and digital media on the side.

felixfurtak

36 posts

Geek
+1 received by user: 8

#323836 27-Apr-2010 19:21

yes, it is quite an old LNB (old Sky dish). But I would have thought that the higher frequency would be the harder one to receive if this were the case. I'm using 10750MHz LNB frequency, which is all that seems to work. What freq. are you guys using??