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Service Providers >> Satellite Connection in Africa >> iDirect LNB 11300 to 10000 Option File https://www.satsig.net/cgi-bin/yabb/YaBB.pl?num=1188643997 Message started by Peter1212 on Sep 1st, 2007 at 11:53am |
Title: iDirect LNB 11300 to 10000 Option File Post by Peter1212 on Sep 1st, 2007 at 11:53am
Hi all,
I am installing an iDirect modem, and the provider sent me an option file for LNB with LO Freq 11300. But my LNB has LO Freq 10000. The old option file for LNB 11300 is rx_freq = 1346149999 rx_acqrange = 3000000 rx_bitrate = 4918000 rx_mode = 2 rx_modtype = 1 rx_fecrate = 15 rx_scram = 1 Could you please tell me the new rx_freq and other things that I have to modify on the above shown option file sothat it can work with LNB 10000. Thanks; Peter |
Title: Re: iDirect LNB 11300 to 10000 Option File Post by Eric Johnston on Sep 2nd, 2007 at 11:23am
Your satellite downlink frequency may be calculated as follows:
1,346,149,999 Hz (L band cable frequency) + 11,300,000,000 Hz (LNB local oscillator frequency) = 12,646,149,999 Hz or 12.646149999 GHz This 12.6 GHz frequency is in the upper part of the Ku band and you need an LNB with a local oscillator like 11.3 GHz to get the cable L band frequency down to within the design range of the iDirect modem receive input, which is, I believe, 950 - 1700 MHz. If you consider the 10 GHz LO LNB. The calculation would give an output frequency into the cable of 2.646 GHz and this is not acceptable to the iDirect modem. The 10 GHz LNB will have been made for satellite downlink frequences like 10.95 - 11.7 or 10.95 - 12.15 GHz, so you are unlikely to see much LNB output at 2.646 GHz anyway. Explain the situation to your service provider. There is a possibility that they may have another iDirect hub service on a different satellite at a suitable frequency for your 10 GHz LNB. Otherwise you will need to buy a Ku band LNB with 11.3 GHz local oscillator frequency. Read more about LNB local oscillator frequencies Best regards, Eric. |
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