An LNBF generally has 2 small “Antennae” placed 90o with respect to each other, 
and with different DC Voltages from the Receiver, can capture signal whose polarity is either horizontal (18V) or Vertical (13V). 
Satellite’s micro signal that is captured, is first mixed with micro wave from the (Local Oscillator) LNB itself, which produces Intermediate frequency or IF with frequencies from 950Mhz to 2050Mhz. This IF is then channeled through coaxial cable to tuner of the Receiver.
C Band LNBF Local Oscillator Frequency is generally 5150MHz, or 5175MHz for special uses. 
Low side Injection example: 
Indosiar channel signal from Palapa C2 is 4074Mhz, so IF from the LNB to tuner is:
5150 – 4074 = 1076MHz
For KU Band LNBF, because KU band ranges from 10950MHz to 12750MHz, single Local Oscillator Frequency is no longer enough, and so there are many L.O.F, for example 9750MHz, 10600MHz, 10750MHz, 11300MHz, 11750MHz, etc. 
High side Injection example:
Astro signal from Measat 1 is 10982Mhz, so IF from the LNB to tuner has to be set at:
10982 – 9750 = 1232MHz
 
RECEIVER 

DVB-S system television show can be received by Receivers with the DVB logo.

 There are two systems available in TVRO broadcast:
Analogue System
Digital System
Out of many digital systems, the one that is currently the most popular is the DVB-S (Digital Video Broadcasting for Satellite) system.
DVB-S advantages
One transponder can carry 15 TV channels and/or 30 Radio channels, with excellent quality:
TV picture = MPEG2 (S Video)
Radio sound = CD grade. 		 DVB-S Disadvantage
Unlike the analogue system, To search channel, we must input the following data:
1. Frequency 2. Polarity 3. Symbol rate
(Recently there are some digital receivers that can do blind search, but this function is not yet practical); 
Generally those data are from the internet websites:
www.lyngsat.com , www.satcodx.com 

Another DVB-S Disadvantage
Because the system is digital, if the signal captured is not strong enough to be processed, then NOTHING will appear on TV screen. This is different from the analogue system, where even the smallest signal captured will be shown by the TV screen, although the picture is blurry.