Freeview Transponder Query

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DanzS

3 posts

Wannabe Geek

#146658 25-May-2014 14:39

Hi,

Hoping someone can help me out with understanding what I might be doing wrong with setting up my satellite freeview box.
The issue I am having is that I dont seem to be able to pick up all the freeview channels on the transponders that I have been told to use.

The transponders I have been told to scan are 12456 H & 12483 H.

I can pick up 12456 but on Vertical not Horizontal. These are the channels I get still on this:
TV3
TV3+1
Four
Sommet
Choice
Cue
Shine
Parliment

I dont get anything at all on 12483 H, however if I do a blind scan it does pick up TV2 on 12671 V and Prime on 12707 V. The signal does come across really weak tho and we often lose TV2 completely due to low signal, either that or it pixelates badly.

I have checked the LNB settings at the dish, 10750, and matched them on the STB. The dish is standard sky one with a Sharp dual throat LND (white oval face).

We used to get all the freeview channels going back a couple of months on a different STB, this stopped working one day. We replaced the box but havnt been able to pick up anything other than what is listed above.

I have played around with the skew of the LNB, this seemed to increase the signal strength slightly but not a lot.

Any ideas on what I might of missed?
Thanks in advance

RunningMan

8953 posts

Uber Geek

#1052841 25-May-2014 15:10

The skew of your LNB is out, causing V & H polarity to swap. See if you can get it back to where it was. If you can look at a neighbour's dish, that should give you the rough angle to start at, then move it a mm or so at a time while looking at the signal strength meter.

You should then be able to scan the transponders on H instead of V, and have enough signal strength to get all transponders.

DanzS

3 posts

Wannabe Geek

#1052844 25-May-2014 15:16

THanks, I have had a play with the skew. When I first went up on the roof there was no obvious signs that it had moved. From what i have read online the recommendation is to have the output cable at approx 8 o'clock position, i tried that but didnt get anything. After turning it a bit more I was able to get a bit of signal. Will try and play with it again, is there a specific angle I should be setting it too (looking from the back of the LNB) ?

Thanks

B1GGLZ

1961 posts

Uber Geek

#1052845 25-May-2014 15:17

All frequencies can be found here
http://www.lyngsat.com/Optus-D1.html

Sounds like your LNB has failed and time for a new one. You could try tuning up or down a few mhz as they usually drift off frequency when failing. Up or down 5 - 10mhz may restore lost channels for a short while.

RunningMan

8953 posts

Uber Geek

#1052941 25-May-2014 17:04

Sounds like you are in about the right place with the skew, just move it a mm or so at a time, let the signal strength meter settle, and adjust for the best signal.

If you are picking up 12707 and 12671 on a blind scan, these are the correct frequencies for some of Sky's transponders - given you are seeing the right frequencies (not a little high or low) it probably means the LNB is OK, but as B1GGLZ suggests, they do have a limited lifespan, and can fail.

You could also try moving the dish itself a few mm up/down/left/right - doesn't take much for the aim to move if there has been high wind or the ground has settled a little.

DanzS

3 posts

Wannabe Geek

#1052958 25-May-2014 17:34

Thanks guys, will re adjust the LNB next weekend, have run out of light for today :-)

Thanks again for your advice

RunningMan

8953 posts

Uber Geek

#1052959 25-May-2014 17:35

Be careful on the roof ;-)