OPERATIONAL DESCRIPTION

FCC ID: JFZT210D

Operational Description

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FCCID_489072

APPENDIX CIRCUIT TO SUPPRESS SPURIOUS RADIATION AND CONTROL MODULATION Audio circuit The signal inputted into CN1—No3 is inputted into IC1B through VR2 gain control. The signal inputted in CN1—No2 is inputted into IC1B though Q1 Buffer—Amp, VR2 gain control. AF signal inputted into IC1B is amplified inside IC. The amplified signal is compressed by 2:1 with IC2 compandor, simultaneously controlling the level of AF signal inputted by the reciprocal action of Q2, IC2, and IC1B. The compressed signal passes preemphasis processing in ICIA, and level adjustment in VR3, before its output. The oscillated signal of 32.768khz by IC3 and X1, mixes with AF signal after passing through IC4 Buffer—Amp, VR4, and 1CS. ' The level—adjusted MIX signal is inputted into VCO1LO01 Nol. Modulator circuit Inputted signal becomes modulation signal inside VCO. Modulated RF signal outputs from VCO, then amplified in RF amplification circuit. RF pre—amplifier and final amplifier RF signal outputted from VCO is amplified in Q101,Q@102, and Q103. @001 and Q104 are RF—SW. Amplified RF signal is adjusted to 10mW by VR101. Amplified RF signal controls its level of higher harmonics by passing through L1—6—L110, C141—C145 low—pass filters The signal passing through the low—pass filters is emanated through an antenna connected to CNOO1. CIRCUIT TO SUPPRESS SPURIOUS RADIATION & CONTROL MODULATION FCC ID: JFZT210


Document Created: 2004-10-29 10:19:51
Document Modified: 2004-10-29 10:19:51
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