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Topic # 82158 22-Apr-2011 10:53
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I have a satellite TV card in my PC and it is working fine using Optus D1, an ex Sky round dish, and the following settings -

LOF1 = 10750
LOF2 = 10750
Switch = 10750

However, reading information in this Forum suggests that for a round sat dish I should be using 11300 for the LOFs and 12750 for the switch.

I'd like to know why/what the differences in LOF's, and just what is the 'switch' part please?

Tks,

R.

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  Reply # 461529 22-Apr-2011 10:56
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Round low noise block. All dishes are round.

Edit: Switch is the transponder frequency that it switches between LO frequencies. Given only one LO frequency then it is irrelevant.




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  Reply # 461536 22-Apr-2011 11:11
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OK, so should I be using 10750 or 11300 for the LOF's?

R.

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  Reply # 461545 22-Apr-2011 11:36
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If you're already getting all the Freeview channels with your current settings, why would you change to other settings? If it ain't broke....




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  Reply # 461550 22-Apr-2011 11:48
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valtam,

ha ha ha, very true but I thought it may effect signal strengths etc.

R.

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  Reply # 461573 22-Apr-2011 13:07
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Rickles: valtam,

ha ha ha, very true but I thought it may effect signal strengths etc.

R.

In a sense, it does.  If you have the intermediate (L.O.) frequency set correctly, you get a signal; if you don't, you don't.
Yours appears to be set correctly. 

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  Reply # 461589 22-Apr-2011 14:06

You need to set your LNB settings to match the frequency of the LNB on the dish.

If it's working, you have it correctly set. If not swap between 11300 and 10750 until it works.

Most LNB's in NZ are either 10750 or 11300MHz (rarely, some are 10600MHz).

How it works is that the downlinked satellite frequency eg 12546MHz (Ku Band) is down-converted in the LNB to a much lower frequency (L-Band) that can be sent by cable to your decoder.

12456 (Ku Band) - 11300 = 1156MHz (L-Band)

or

12456 (Ku Band) - 10750 = 1706MHz (L-Band)

Your receiver is actually tuning in the frequency that is a result of subtracting the LO frequency off of the satellite frequency. The only way this can work is if your decoder "knows" the LNB frequency in your dish.

Satellite decoders ony receive signals from 950-2150MHz. The correct LNB must be chosen to give you a frequency within this range.

If a satellite has lower frequency signals on it, you will need a lower frequency LNB to put it into this range.

LNB's that switch frequency are used where a larger variation in satellite frequencies exist so that the decoder can switch the LNB to keep the frequencies between 950-2150MHz.

Happy tuning!




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  Reply # 461596 22-Apr-2011 14:46
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Thanks for that ... great explanation.

R.

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