Circuit Description

FCC ID: 2AB4XAMP10521

Operational Description

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FCCID_2290369

#10521 Circuit Description

This product is walkie talkie mainly work by a transceiver IC and microprocessor.

TX Description
Once MCU detect an PTT switch was press, MCU(U1) will general a digital command
to Walkie Talkie IC(U2). Walkie Talkie will change to tx mode and detect Microphone
signal.
Microphone voce signal will be modulated to FM signal inside Walkie Talkie IC(U2).
The modulated FM signal will then pass to RF amplifier IC(U3), after pass though RF
filter section. RF signal will send out though antenna.

RX Description.
Normal states of walkie talkie work in RX mode. RF signal will input to RF circuit
through antenna to Walkie Talkie IC(U2). Once received signal, Walkie Talkie will
demodulated RF signal to voice signal and pass Audio Amplifier IC(U4) to
Speaker. MCU (U1)will check the signal SNR to enable and disable Audio Amplifier IC
for muting control.

Document Created: 2019-11-06 01:41:19
Document Modified: 2019-11-06 01:41:19

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