|
Apr 30th, 2009 at 5:18pm
If you have a Ku band LNB (10-12GHz) for satellite TV it is likely that the LNB is a "Universal" type, capable of operating on vertical or horizontal polarisation and in the lower or upper parts of Ku band by command from the receiver. 13V or 19V being used to select the polarisation and a 22kHz tone to select the band (9.75 or 10.6 GHz LO freq). If you have such a "Universal" LNB then you need to learn how to drive it using the receiver set up.
If you have a single polarisation Ku band LNB with fixed LO freq, then you would benefit by buying a "Universal" version.
If you are using a C band LNB (4 GHz) is is possible that it is set to one particular polarisation; in which case you are missing half of all possible programs. You can change linear polarisation by turning it by 90 deg. You may be able to change circular polarisation by turning a dielectric plate polariser by 90 deg. Study the design of your LNB. There are variations with some having the possibility of remote control, some mechanical, some electro-magnetic etc. Get hold of the LNB and feed system operating guide, if possible.
Best regards, Eric.
|
