Page: 4 of 8
wave signal. To fed IC203 pin 97produce weather alert.
!"
PC Program
J203 on CPU is connected with the outside cabinet through a cable with a round pin8 plug. Software
upgrade and clone can be functioned when an exclusive interface control box is connected with RS-232
interface of computer.
When the light on control box is green, J203 pin3 is high level (5v), CPU programming is performed, and
the software is upgraded. When the light on control box is red, clone function is performed.
!"
DSC Feature
!"
DSC TX Encoded by MCU IC203, through RP1, R237, R234, produces D/A convert, and IC205D low pass
filter forms FSK signal. This signal is amplified by IC205A and filtered by IC10C, IC10D to modulate VCO
frequency from the DSC signal transmit output.
DSC RX decode: DSC signal from 2nd receiver is Send to IC15 pin13 on the main from pin 14 of IC15
output, then the signal passes through IC6C high-pass filter and IC6D low-pass filter form FSK signal. This
FSK is signal decoded by IC609. The DSC is restored by IC203 [MCU] with RX data from pin1 Of IC609
!"
GPS Message
External GPS Message is input to MCU through phototransistor IC207 LCD will display the machine
current location and time message in idle state.
!"
ATIS Feature (only EU)
ATIS encoded by MCU (IC203), through RP1, R237, R234, produces D/A conversion, and IC205D low
pass filter forms FSK signal. Through the attenuation be composed of R215, R218, R274 and Q204 This
signal is amplified by IC205A and filtered by IC10C, IC10D to modulate VCO frequency forming the ATIS
signal transmit output.
ATIS signal is received and demodulated by IC7. Demodulated signal is sent into pin12 of IC15, from pin
14 of IC15 output .the signal passes through IC6C high-pass filter and IC6D low-pass filter to get ATIS
FSK signal and filter out residual unwanted signals. This FSK is signal decoded by IC609. The ATIS is
restored and processed by MCU IC203 with RX data from pin1 of IC609. Be formed control signal to
production about 100ms squelch to mute audio speak path.
