TS-990S8CIRCUIT DESCRIPTIONa 62.4MHz.The harmonic components are cut by the BPF from the62.4MHz, amplifi ed by Q57, and output as an SLO2.The diode switch (D52) cuts the output of SLO2 if IFB isselected.CN4240MR40MQ1BufferIC1PLL15.6MX1,Q13BufferQ19BufferQ25 Q34 Q50,52 Q57Q4AMPIC10PLL393.6MQ16AMPQ11AMPQ23 IC14DDSIC15AMPDoublerD16D19D25AMPQ49CF1BufferQ29AMPQ28D11Phase MODBufferQ20FM MODAMPQ3 IC11DDSCN66FMODAMPQ2DoublerBufferQ5 IC12DDSDoublerD52 CN65SLO2AMPQ61CN63SLO1D22D23D32D33D34D44D45D46D56D36D26D27D53D54D55IC16PLL73.125~87.755MHz87.755~103.505MHz103.505~120.94MHz120.94~133.095MHzQ17, Q18, Q39, Q40AMPQ51AMPQ60AMPQ56 CN59TLO1CN64SLO3BufferFig. 4 Reference signal generator of the transmitter and receiver block, TLO1/SLO1/SLO2/SLO3■ SLO3 (3rd Local Oscillator for Sub Receiver)The DDS (IC12) generates an SLO3 which is used forthe modulator and detector.The DDS outputs the signal via the BPF as an SLO3.