Typical Prime Focus LNBFs...
Posted: Sat Jan 02, 2021 7:46 pm
Typical Prime Focus LNBFs...
The most common prime focus LNBFs on the market are C band LNBFs, Ku band LNBFs and C/Ku combo LNBFs.
A C band LNBF will only amplify and downconvert C band signals (3.4 GHz to 4.2 GHz). Such LNBFs can be either single-output or dual-output and can process either linear polarity or circular polarity signals. A linear polarity C band LNBF can be converted to a circular polarity LNBF by simply placing a dielectric plate in its throat.
A Ku band LNBF will only amplify and downconvert Ku band signals (11.7 GHz to 12.7 GHz). Such LNBFs can be either single-output or dual-output and can process either linear polarity or circular polarity signals. A linear polarity Ku band LNBF can be converted to a circular polarity LNBF by simply placing a dielectric plate in its throat.
A C/Ku band LNBF can amplify and downconvert both C band signals (3.4 GHz to 4.2 GHz) and Ku band signals (11.7 GHz to 12.7 GHz) together. The main advantage of a C/Ku combo LNBF is the fact that it can process both bands. However, since it combines both bands, it is not as efficient and both signals suffer some attenuation usually in the range of 1–2 dB. This can be problematic for smaller TVRO antennas (8 ft) where the gain of the reflector is just above the threshold of reception for most C band signals. A C/Ku LNBF is thus better suited for 10 ft or 12 ft antennas where more reflector gain will offset any attenuation caused by the inefficient LNBF. The majority of C/Ku LNBFs are single-output and can process either linear or circular polarities.
All the LNBFs mentioned above have two internal probes that are set 90 degrees apart for receiving either Vertical and Horizontal linear polarity signals or Right and Left circular polarity signals. Polarity is selected by a 12V or 18V DC voltage from the receiver...
The most common prime focus LNBFs on the market are C band LNBFs, Ku band LNBFs and C/Ku combo LNBFs.
A C band LNBF will only amplify and downconvert C band signals (3.4 GHz to 4.2 GHz). Such LNBFs can be either single-output or dual-output and can process either linear polarity or circular polarity signals. A linear polarity C band LNBF can be converted to a circular polarity LNBF by simply placing a dielectric plate in its throat.
A Ku band LNBF will only amplify and downconvert Ku band signals (11.7 GHz to 12.7 GHz). Such LNBFs can be either single-output or dual-output and can process either linear polarity or circular polarity signals. A linear polarity Ku band LNBF can be converted to a circular polarity LNBF by simply placing a dielectric plate in its throat.
- lnb_types.JPG (33.31 KiB) Viewed 966 times
All the LNBFs mentioned above have two internal probes that are set 90 degrees apart for receiving either Vertical and Horizontal linear polarity signals or Right and Left circular polarity signals. Polarity is selected by a 12V or 18V DC voltage from the receiver...