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ALAN48EXCEL-MULTI-all-papers.pdfDescription Of Frequency Determining And Stabilizing Circuit Introduction The frequencies for transmitter and receiver local frequencies are all derived a signal 4.5 [MHz] crystal by means of a phase locked loop. The first local oscillator frequencies are 16.27 [MHz] (CH.1) to 16.71 [MHz] (CH.40). The second local frequency is fixed at 10.240 [MHz] to generate second IF 455 [KHz]. During transmit, the VCO of the PLL operates 13.4825[MHZ] (CH.1) to 13.7025 [MHz] (CH.40). The VCO frequency goes to the doublers circuit Q301, L301, L302 which doublers the frequency to generate 26.965 [MHz] (CH.1) to 27.405 [MHz] (CH.40). Q503 Q504 Q301 T o Transmitter VCO Doubler 13.4825[MHz] (CH.1) 26.965 [MHz] (CH.1) ~ 13.7025 [MHz] (CH.40) ~ 27.405 [MHz] (CH.40) The VCO operating frequency for the receiver is 16.27 [MHz] (CH

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