LOS 1
Overview
The D46 i.e. The VCO 1 & VCO 2 are used to generate the signals whose frequency lies in the range of 100 MHz to 400 MHz. The VCO 1 generates the signals with a frequency range of 100 to 200 MHz and the range of VCO 2 is 200 to 400 MHz. The D47 i.e. the VCO 3 & the YIG generates the frequency in the range 400 MHz to 1750 MHz in which VCO 3 takes care of 400 to 600 MHz and YIG takes care of frequency in the range of 600 to 1750 MHz. The frequency in the range of 600-1750 which is generated by YIG is not used for LO Synthesizer 1. The D48 unit acts as the synthesizer unit. The D49 unit is the control unit for the LO synthesizer System.
D46 :
The D-46 PIU is used to generate the frequency ranging from 100 MHz to 400MHz. The VCO 1 i.e. the first Voltage Controlled Oscillator is used for generating the frequency in the range of 100MHz to 200MHz with a
step size of 1MHz whereas the frequencies in the range of 200MHz to 400MHz are generated by VCO 2. D46 PIU consists of two Low Pass Filters of frequency 200MHz and 410MHz, along with a current monitor and monitor multiplexer unit.
D47 :
The D-47 PIU is used to generate the frequency ranging from 400 MHz to 1750MHz. The VCO 3 i.e. the third Voltage Controlled Oscillator is used for generating the frequency in the range of 400MHz to 600MHz whereas the frequencies in the range of 600MHz to 1750MHz are generated by Yig. The frequency generated by this PIU acts as the reference frequency for the D48 PIU i.e. the Synthesizer PIU.
D48 :
The D48 PIU is called as the Synthesizer PIU. It uses Peregrine prescalar for SYNTH 1 and Qualcomm Prescalar for SYNTH 2. It contains Overall Lock Indicator, Temperature Monitor, Isolated Amplifier, Power Amplifier, SP4T switch.
D49 :
The D-49 PIU is a monitor and control unit used to control LO Synthesizer System. The PIU consists of a control card, a monitor card, a MCM card, and a WNG card which are used to keep monitoring and controlling the working of the system.
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