Replies to This Discussion

Permalink Reply by Alan on July 4, 2013 at 20:59

That transponder frequencies should be 12456 and 12483 here is the bandplan for the Optus D1.

ttp://www.lyngsat.com/Optus-D1.html

Permalink Reply by Bill McMurray on July 4, 2013 at 21:00

Hi J Howell,

You say you are getting the channels on 12462 transponder okay, but the frequency for that transponder is actually 12456!!  So I guess you must have done a "blind scan" at some time of just that transponder to get that frequency loaded into your receiver.

That's why one transponder (with the wrong frequency) is picking up the channels and one (with the right frequency -12483 ) isn't picking up any channels. If you search for transponder 12489, you would probably pick up the channels; but that wouldn't fix the problem, just get around it.

Now, that tells me one of two things are wrong:- 1. The Local Oscillation (L.O.) of your LNB has wandered by 6 Mhz and is now operating at 11306 (instead of 11300) or 10756 (instead of 10750).

2. The wrong L.O. setting has been entered into your receiver; either 11306 (instead of 11300) or 10756 (instead of 10750).

(My guess is that it's the LNB, because they slowly wander further and further, and you say it used to work, then intermittantly, now not at all).

So check what the L.O. setting is in your receiver. If it's not 11300 or 10750, then change the L.O. setting and do another blind scan. Also make sure the "type" of LNB is set on "KU Band", "Single", "Standard", or something like that - NOT UNIVERSAL!

If the settings in your receiver are all correct, then your LNB is shot! Buy a new, good quality one, but make sure it's the same L.O. as your settings - if you fit an L.O.11300 LNB, then make sure the setting in your receiver is11300!

Cheers,    Bill. 

Permalink Reply by Robert Hepple on July 23, 2013 at 22:24

Sounds like your best bet is to call in a professional , they will align the dish correctly and sort the issue

Permalink Reply by Mike G on July 24, 2013 at 10:01

If the LNB is old, that will most likely be the problem. The old Sharp brand dual throat oval Sky LNBs go off frequency as they get old. It sounds like this may have happened because the 12462 should be 12456. If you try 12489 for the other one it might work because it will be 6MHz higher like the other one.

Permalink Reply by j howell on July 24, 2013 at 13:45

Hi all, thanks for the suggestions. It seems like the LO of my LNB has wandered as described above by Bill. As he suggested, I changed the settings in the receiver, and now it picks up all the channels perfectly using the incorrect frequencies. Its worked fine for two weeks now, but If it continues to wander, I will try adjusting the frequency again, and if that doesn't work, then seems like at some point I might need to replace the LNB.