Codan L-Band Block Upconverter (BUC) System HiSeasNet Training Course

Codan L-Band Low Power Block Upconverter (LBUC) - Technical Overview Main Components Low Power BUC (Block Upconverter) TRANSMIT LNB RECEIVE

Low Power Block Upconverter (LBUC) Transceiver Block Diagram

L-Band IF Transceiver - Transmit Tx IF cable carries: Tx L-Band IF signal Frequency Reference from Modem or Interface Unit (10 MHz) FSK Monitor & Control signals 24 or 48VDC for LBUC supplies

L-Band IF Transceiver - Receive LNB Optional from Codan C-Band & Ku-Band versions Rx IF cable carries: Rx IF signal from LNB to the Modem Power from Modem (15 VDC nominal) Reference Frequency from Modem (10 MHz)

LNB Specifications Frequency range Ku-Band Band 1 10.95 - 11.70 GHz Band 2 11.70 - 12.20 GHz Band 3 12.25 - 12.75 GHz Gain Ku-Band 60 dB Noise temperature Ku-Band 75 K max

Block Upconverter (BUC) Transmit Frequency Conversions The Block Upconverter (BUC) is responsible for the transmission of the desired carrier at the correct TX frequency. It takes the L-Band input from the modem and upconverts it to Ku-Band. The BUC is a single conversion system which is frequency inverting. Therefore, the higher the L-Band frequency the lower the transmit RF frequency. Ku-Band does not require the LO set - only one LO frequency is required to cover the full Ku-Band frequency plan. This LO Frequency is 15.450 GHz To calculate the required modem IF frequency for a given RF frequency: frequencyIF = frequencyLO – frequencyRF

BUC Frequency Plan (Ku-Band) Ku-Band - LBUC RF: 13750 - 14500 MHz IF: 950 - 1700 MHz LO fixed at 15450 MHz Ku-Band - MBUC RF: 14000 - 14500 MHz IF: 950 - 1450 MHz LO fixed at 15450 MHz 1700 MHz 1450 MHz 950 MHz 14500 MHz 14000 MHz 13750 MHz IF input RF output 1450 MHz 950 MHz 14000 MHz 14500 MHz IF input RF output

Low Noise Block Downconverter (LNB) Frequency Plan Each Low Noise Block Downconverter (LNB) used in this system has its own internal Reference Oscillator it uses to downconvert the received Ku-Band Signals to L-Band signals. This oscillator is commonly referred to as the Local Oscillator (LO). The LO frequency is different depending on the 3 different Receive Bands. The three Receive Bands are: Band 1 10.95 - 11.70 GHz LNB LO Freq = 10.00 GHz Band 2 11.70 - 12.20 GHz LNB LO Freq = 10.75 GHz Band 3 12.25 - 12.75 GHz LNB LO Freq = 11.30 GHz The LNB Downconversion process is a single step process that is NOT Frequency Inverted. This means that the LO frequency is subtracted from the Ku-Band Receive frequency to determine the L-Band Receive Frequency. frequencyIF = frequencyRF – frequencyLO

Frequency Conversion Examples - Transmit Following are frequency conversion calculation examples based on the R/V Oceanus Shipboard configuration. Transmit Frequency - Calculate the L-Band transmit frequency to be entered in the Comtech modem to transmit the correct Ku-Band frequency. Required Transmit Ku-Band Frequency => 14.436215 GHz (14436.215 MHz) BUC LO Frequency => 15.450 GHz (15450 MHz) frequencyIF = frequencyLO – frequencyRF frequencyIF = 15450 MHz – 14436.215 MHz frequencyIF = 1013.785 MHz

Frequency Conversion Examples - Receive Following are frequency conversion calculation examples based on the R/V Oceanus Shipboard configuration. Receive Frequency - Calculate the L-Band receive frequency to be entered in the Comtech modem to receive the transmitted Ku-Band frequency. First – Convert the Transmit Ku-band frequency to the Receive Ku-Band frequency. Do this by subtracting the satellite translation value from the TX Ku-Band frequency. The satellite translation value is 2300 MHz Transmit Ku-Band Frequency - Translation = Receive Ku-Band Frequency 14436.215 MHz - 2300 MHz = 12136.215 MHz Next – Subtract the LNB LO frequency from the Receive Ku-Band Frequency to determine the correct Receive L-Band Frequency frequencyIF = frequencyRF – frequencyLO frequencyIF = 12136.215 MHz - 10750 MHz frequencyIF = 1386.215 MHz

BUC Indicators/Alarms There are three LEDs on the BUC PWR (Power) Green – Indicating Power present Tx (Transmit) Yellow – Indicates BUC RF PA is ON FLT (Fault) Red – Two possible states: On – steady Flash – two flashes every second

BUC Fault LED (NOTE HiSeasNet does not have any redundant systems) OFF No Faults or latched faults present. ON Fault Condition exists Over Temperature (>90ºC) Fan Fault PA Fault LO Fault Output power below set threshold Hardware/software incompatibility Flashing Primarily used in Redundant Systems to indicate: * LNB Fault * Redundancy Controller Fault (NOTE HiSeasNet does not have any redundant systems)

Codan L-Band LBUC BUC Command List – 69xx HLP General Help (this Display) HLP Help for Set Commands HSC Help for Output Commands HOC Help for Reset Commands HRC Help for View Commands HVC HSC Set Transmit On STOn n=0: Off, n=1: On Set On Line SOLn n=0: Off-Line, n=1: On-Line Set Compensation Freq SCFn 13750<=n<=14500, 950<=n<=1700, n=0: Wideband Set Transmit Attenuator STAn n=0, 4, 8, 12 Set Tx Alarm Threshold SATn 16.0<=n<=33.0, n=0: Disable Set Burst Threshold SBTn 16.0<=n<=33.0, n=0: Disable Set LO Frequency SLOn n=15450 Set Transmit Default STDn n=0: Transmit Off, n=1: Last State Set Redundancy Mode SRMn n=0: Non, n=1: Warm, n=2: Hot Set Serial Interface SSIr,l,p,s,t (Rate, Len, Parity, Stop, Term) Set Packet Protocol SPPn 0<=n<=4 Set Packet Address SADn 1<=n<=126 Set Echo SECn n=0: Echo Off, n=1: Echo On

Codan L-Band LBUC BUC Command List – 69xx (cont) HOC Output Tx On OTO Output On Line State OOL Output Tx Frequency OCF Output Tx Attenuator OTA Output Pwr Alarm Thresh OAT Output Burst Threshold OBT Output LO Frequency OLO Output Tx Default OTD Output Redundant Mode ORM Output Serial I/face OSI Output Packet Protocol OPP Output Packet Address OAD Output Echo OEC Output System Status OSS Output Fault Status OFS Output Latched Faults OLF Output Status Poll OSP Output PA State OPA Output Burst Power OBP Output Power Output OPO Output Temp of BUC OTB Output IF Compen. Freq OIC Output Identity Data OID Output Max/Min Temps OMT Output Protocol Data OPD Output Limit Data OLD Output Device Type ODT Output Build Standard OBS Output BUC Config OBC

Codan L-Band LBUC BUC Command List – 69xx (cont) HRC Reset BUC RST Reset Change Bits RCB Reset to Default Values RDV Reset Latched Faults RLFHVC View System Status VSS View Fault Status VFS View Limit Data VLD View Protocol Data VPD View Operational Data VOD View Build Standard VBS View Identity Data VID