101°Satellite Has 32 transponders Each 24 MHz wide Circular polarity 16 right hand 13Volt Odd Transponders 16 left hand18 Volt Even Transponders Transmit at 12.1 GHz to 12.7 GHz
110°Satellite Has 3 transponders numbers 8, 10, and 12 Each 24 MHz wide Circular polarity 3 left hand18 Volt Even Transponders Transmit at 12.1 GHz to 12.7 GHz
Has 11 transponders numbers 22-32 Each 24 MHz wide Circular polarity 5 right hand 13Volt Odd Transponders 6 left hand18 Volt Even Transponders Transmit at 12.1 GHz to 12.7 GHz 119°Satellite
The LNB Dual output LNB Down converted frequency 950 MHz to 1450 MHz Polarity selected by13 or 18 volts One needed per satellite (no Sat C Kit or LNB)
Frequency Lineup Numbers are in MHz 530/54250830/862/9501450/15252025 (----------------L-Band------------)(----CATV Band----)(Sub- Band)
530/54250830/862/9501450/15252025 Location of each Satellite and other services (-----------------101°---------------)(110° / 119°) Digital Broadcast & Data Data Return Path The 101°bird is located from 950 MHz to 2025 MHz which includes both polarities The 110° & 119° birds are located between 250 MHz & 830 MHz
Local Digital Broadcast 530/54250830/862/9501450/15252025 Channels 2-654 to 90 MHz Channels 7-13174 to 216 MHz That gives us room for 12 local digital broadcast channels
Satellite Usage for DirecTV® Ku-band 10.7GHz to 14.5GHz Ka-band 17.3GHz to 31.0GHz
Tools of the Trade Meters MDU Meter by Applied Instruments Has full bandwidth from 5 MHz to 2150 MHz Has special Triad® Menu to read transponders in the Cable bandwidth
Tools of the Trade Meters FSM 400 by Televes Has full bandwidth from 5 MHz to 2150 MHz Full spectrum Analyzer
Tools of the Trade Connectors Use Compression only Maintains our integrity through the entire frequency spectrum from 5 MHz to 2150 MHz.
Formulas dBm to dBmv 0 dBm = 48.75 dBmv Input threshold of IRD- -55 to –35 dBm RG-6 cable loss-9.34dB per 100 feet at 2Ghz RG-59 cable loss-11.67dB per 100 feet at 2 Ghz RG-11 cable loss –6.36dB per 100 feet at 2 Ghz
Formulas Loop resistance E=I x R E=voltage loss through cable run I=current being drawn through cable (in Amperes) R=loop resistance x cable length (in feet) Example: Loop resistance of RG6 cable is.04 ohms per foot. RG11 is.02 ohms per ft. LNB uses.3 amp of current. Operating voltage of LNB is 11-14V for right hand polarity 15.5-21V for left hand polarity
Formulas Loop resistance exercise How much voltage is lost through 300 feet of RG6? I=.3 Amp draw of LNB (300 mA) R=.04 (loop resistance of RG6)x300 (length of cable in feet) E= (.3) x (.04 x 300) or E=3.6 volts If we start with 18 volts for the left hand polarity and we lose 3.6 volts, the result is 14.4 volts reaching the LNB. We need 15.5 volts for the left hand polarity to work, so the 18 volt side will only deliver the right hand polarity. NO LEFT HAND POLARITY!!!
Cable Facts DC voltage 50 MHz 450 MHz 950 MHz 1450 MHz 2050 MHz Things that affect signal in cable are sharp bends, staples, cable ties, etc.
Amplification General rules One of the most often mistakes is overloading the input to a amplifier. To figure out how much signal you can put into a amplifier you do the following: Output – gain = input
Amplification Typically you can find the output and gain for the amplifier from the manufacturers specifications. By overloading the input to a amplifier you will corrupt the data and the entire system will be down.