Operational description

FCC ID: ROJ6282

Operational Description

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FCCID_2082877

Confidential Operational Description SAILOR 6282 AIS Transponder is a Class A AIS which normally is connected to the Display/Keyboard unit SAILOR 6004 Control Panel or an ECDIS to handle target list, settings etc. General Receiver principle. The receiver is a software defined radio. The antenna signal is routed to an ADC. The ADC sample clock is 122.880MHz. The ADC sample data is transferred to a FPGA. The FPGA have 3 parallel receive processes; 2 AIS channels and 1 DSC channel (156.525MHz). All receivers are built in FPGA, the operating principle are the same. The difference is the receive frequency. The FPGA down converts all 3 RF channels to zero frequency. The resulting 6 - I/Q Channels are further processed in a DSP. List of IF frequencies: RX Freq. Mhz 156.025Mhz 156.525Mhz 162.025Mhz IF=Rx-122.88Mhz 33.145Mhz 33.645Mhz 39.145Mhz Switching Range: The range is determined by the two SAW RF input filters. The pass band is 156.025Mhz – 162.025Mhz and the stop band is 159Mhz +30Mhz -15Mhz. The nominal IF frequency resulting from the subsampling of the input frequency is shown in the table above. The normal sensitivity is -110dBm AIS Transmitter Exciter The exciter generates the TX signal by mixing a 100MHz VCXO with a LO from a PLL controlled VCO. f(TX) = f(VCO) – f(VCXO) The VCO covers the frequency range 256.025MHz to 262.025MHz in 25 kHz steps. The VCXO is modulated by the baseband information generated by a DAC controlled by the DSP. The antenna shift function is made by PIN diodes. The final RF amplifying stage consists of a Power Amplifier module which is supplied with 8.5 VDC and delivers the 12.5 W RF output power to the antenna. The output power is stabilized by a power regulator circuit which controls the PA. The output power can be reduced to 1W Helge Hoff Senior Engineer Thrane & Thrane A/S · Lundtoftegaardsvej 93 D · DK-2800 Kgs. Lyngby · Denmark T +45 39 55 88 00 · F +45 39 55 88 88 · www.cobham.com Bank: Danske Bank · Comp.reg.: 65 72 46 18 · VAT: DK-20 64 64 46


Document Created: 2013-06-27 09:23:13
Document Modified: 2013-06-27 09:23:13
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