Universal Digital Twin LNB
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Product information
This is a high specification universal twin output device with low noise figure of only 0.1dB. Suitable for all digital, analogue, HD High Definition and SD Standard Definition transmissions.
Twin lnb,KU-band two exits LNBF
Low Noise Figure 0.1dB
HDTV digital ready
Easy installation
Waterproof slide-down...
SPECIFICATIONS:
Input Frequency: 10.70~11.7GHz(LOW BAND);10.70~12.75GHz(HIGH BAND)
Output Frequency: 950~1950MHz(LOW BAND);1100~2150MHz(HIGH BAND)
LO Frequency: 9.75/10.6GHz;9.75/10.75GHz
Noise Figure: 0.1dB
Conversion Gain: 60dB
What is an LNB?
Low Noise Block-downconverter (so called because it converts a whole band or "block" of frequencies to a lower band).
Also incorrectly known as a "Low Noise Block" or a "Low Noise Blocker"!
An LNB sits on the end of an arm and faces the parabolic reflector ("dish") which focusses the signals from a satellite 24,000 miles away into the "feed horn" of the LNB
The LNB converts the signals to a lower frequency and sends them out to the cable connector, which you connect to your satellite receiver via coaxial cable.
What is an LNBF?
This is the term for an LNB with an integral feed horn. Nowadays the "F" tends to be omitted.
What is an LNC?
Low Noise Converter. Basically the same thing.
A modern "universal" LNB is able to operate in four modes to provide signals from four frequency bands, known as "low-horizontal", "high-horizontal", "low-vertical" and "high-vertical". An LNB may have more than one output but any one output can provide only ONE of these bands at a time.
In order to tell the LNB output which of the four frequency bands it needs to provide, the receiver "communicates" with the LNB as follows (this gets technical):-
A modern "Universal" LNB requires a 22 kHz signal at 0.5v p-p to switch its Local Oscillator to 10.6 GHz ("high band"). Otherwise it uses its 9.75 GHz oscillator.
Polarisation switching is controlled by DC voltage supplied by the receiver. 12.5v to 14.5v gives vertical and 15.5 to 18v gives horizontal polarisation. A higher voltage than that can damage the LNB. A voltage that is too low will prevent the LNB from working correctly.
Under normal circumstances, one cable can carry only one LNB feed (because of the voltage and tone communication method), although it is sometimes possible to use a "stacker-destacker" to carry two.
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