Circuit Description. The signal from the antenna is passed through atransmission/reception selector circuit and is

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1 Circuit Description.RECEIVER The signal from the antenna is passed through atransmission/reception selector circuit and is amplified by T7. The signalafter amplified enter to 86 for processing thenoutput the audio, the audio signal is amplified by UTC8 and output by the speaker at last. ANI ANT. ANTW T7 T7 U U 86 ANTSW 86 Figure. RECEIVER CIRCUIT U5 U5 UTC8 UTC8 SP.TRANSMITTER The signal from the microphone passes through 86, after modulation in the carrier modulation, the modulation signal with the carrier promotes by buffer T,T, and amplified by T then sends to the antenna terminals.. ANI ANT. U U T T T T T T T Figure.TRANSMITTER CIRCUIT

2 .TRANSMISSION/RECEPTION SELECTOR CIRCUIT The transmission output is passed through the transmission/reception selector circuit and low-pass filter to the antenna. The transmission/reception selector circuit, which consists of diodes D6, D60, D6 and D6, is turned on during transmission and off during reception to switch the signal..digital CONTROL CIRCUIT SIDE KEY AND EODER CIRCUIT The signal from side key and encoder is directly input to the processor. Reset and backup circuit When turn on the power,apositive pulse is output from the reset circuit consisting of D8, C8and R8 to the third feed of resetterminal on U8 microprocessor.when turnoff the power, U57detects a. Vdrop, and outputalow signal, itoutputs data to U8 and enter backup mode. Figure,digital control circuit BATTERY VOLTAGE TEST CIRCUIT Power supply voltage after partial pressure input to the microprocessor analog interface BATTERY SAVE CIRCUIT The squelch is off during receive. The power circuit enters battery save mode if no key has been pressed for five seconds.the circuit is controlled by microprocessor directly.

3 5.86 DESCRIPTION MAINLY SECTION DESCRIPTION.DSP consists of IF amplifier,fm modulation, RSSI calculator,afc control circuit, audio/audio mixer filter,ctcss/dcs filter and so on..synthesizer mainly functions: The synthesizer produces a local oscillator signal, used to switch the RF input to a continuous low medium frequency. Synthesizer provides the base clock to adjust the VCO frequency..base CLOCK 86 ports more base clocks, for example,.8 MHz,MHz and so on..serial CONTROL INTERFACE Athree lines serial control interface is used to read the main IC and 86 control record. Serial control is characters in length, 8 bit numeric string and 6bit address string.

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12 E D C B A 5 6 VDD Out GND NU NU 6 VDD COUT VDD VDD 5 6 CBC NU CLK NU 7 0 DATA NU 8 NU GND Vcc A0 WP A 6 CK A 5 DA GND 5C VC 6 XOUT GND AVDD SCLK SDIO AVDD XTAL XTAL MODE SENB Cc PDN AVDD PABIAS AVDD RFOUT T O VCC O GND IN- 8 IN+ IN out in E D C B A TX_P TX_P T T T T T SW87 ALARM SW85 PTT SW8 CALL SW8 MONI SW85A SW-6 R87 00K D875 LED(R) R875.5K T875 DTCEE C876 R87 5K R8 C87 C85 C8 C8 D877 LED(G) R877 T877 DTCEE R8 R87 0K R85 0 R85 0 R856 0 R858 0 R86 C878 C87 R88 R857 C858 R87 K7 R85 K7 R8 K7 R8 K7 R855 C856 RX_LED TX_LED BATDET R85 C85 R85 C85 PTT ALARM D8 CH CH CH CH C8 R8 0K C8 RDA_SDIO/CALL MONI/BEEP TX_LED C8 R8 T8 U8 RQ7A C89 P C88 P CR88.768KHz RDA_SQ VOX_DET RDA_PDN CHORD_SCLK BATDET RDA_SCLK/PTT APC P 7 _ 6 OS C I P 7 _ 5 OS C O P 7 _ R E S E T P 7 _ P 5 _ 0 ALARM RXD RXD P 7 _ P 5 _ P 7 _ P 5 _ R D A _ S D IO /C A L L P 7 _ 0 P 5 _ RDA_CODE IN/OUT RX_LED RDA_SCLK/PTT PTT C85 V C C P 5 _ V D D P 5 _ 5 V S S P 5 _ 6 P 6 _ 7 P 6 _ 0 P 6 _ 6 P 6 _ P 6 _ 5 6 P 6 _ RDA_CSS IN/OUT MONI/BEEP CH CH CH CH TX_LED P 6 _ P 6 _ CHORD_SCLK R5 0K RDA_INT RDA_SCLK/PTT RDA_PDN VOX_DET RDA_SQ APC TXD C8 L8 0T C8 U8 SMP8UD-0600 R5 K R5 5 R5 K C5 C55 U5 AUDIO-6 C8 NU NU 5 R55 56K RDA_CODE IN/OUT RDA_CSS IN/OUT C5 RDA_SDIO/CALL APC APC P_AMP P_AMP TXD TXD VOX_DET VOX_DET R8 0K C8 R K C MONI/BEEP R55 M R D A _C OD E I N / OU T R D A _S D I O/C A LL RV 50K D5 KDS C55 C0 U8 C08 R7 R55 K7 C55 7P TXD RXD C5 APC P_AMP R0 P_AMP RDA_INT CR5 6MHz T0 SB6 C0 RDA_CSS IN/OUT RDA_SCLK/PTT RDA_PDN RDA_SQ C7 T5 MRF97 R5 K7 C 0P R5 K R5 70K R9 0K C5 C6 0P C C5 7P C5 R5 8K R5 0 C56 C C0 R0 K C9 C5 05P R5 R6 C5 T0 DTCEE U RDA86 C58 R58 K GPIO0/CSS_IO GPIO/CODE_IO GPIO/INT GPIO/SDO AFOUT P_TX C0 _IN AVDD GPIO5/TXON 7 GPIO/RXON GPIO6/SQ GPIO7/VOX RFIN AVDD C0 0uF/6V C7 05P R7 R6 K7 L96 C95 C 0P C97 L9 C8 0P C9 C0 C C7 C98 C96 C9 C9 C9 L 0T C6 P_RX T L75 nh L R C7 C 05P C77 C7 C75 P C79 R R C5 R5 T77 DTCEE C7 C C C6 R7 L7 nh T7 SK8 R7 R9 K9 R6 K5 C T76 DTAYE C70 C7 L7 90NH L8 5NH T SC56 R R68 00K R69 00K C7 R8 C P L76 0T R67 00K R66 M C65 C8 R R C78 C76 C66 C7 C R APC C8 R7 L5 C5 R8 K T8 SK8 R8 00K R6 7R C6 C5 C8 C8 05P L 0T L 0./.5/T T HE078 R8 M C R 0P E80.7uF (T.Y.) U70B LM90V C5 C C 0P R86 K C C5 C 5P C7 C80 R8 R85 80K R L5.NH R77 0K R8 0K C8 C C6 R R 7R BATT T C76 L 0T L6 8T(05) T HE0009 U70A LM90V C75 00P R75 50K T C uf R6 L55 C5 R7 50K R7 50K C C6 C7 R7 50K R7 50K C5 C7 BATT T R70 50K C7 C8 T7 DTCEE E5 R8 C9 K R57 R59 T5 R5 SA6 E56 C56 R7 E5 uf uf/0v U5 C57 C59 00K R C UTC8 C60 C6 P T 8K KTC08(HF) R5 K R55 C55 K R5 C5 K T5 DTCEE C5 C5 7P RDA_SCLK/PTT RDA_SCLK/PTT RDA_SCLK/PTT TXD TXD TXD RXD RXD RXD AF AF AF APC AF i P_AMP P_AMP R87 0K T8 DTAYE C55 C58 C50 P R58 C5 E5 0uF TX_P R0 0. R05 0. R06 0. BATT C5 0P TXD RXD AF AF i BATT RDA_SCLK/PTT IN- SP- SP+ RXD TXD C5 P AF AF i R95 K7 C56 R57 0.*.*T L6 NH C6 P C9 C95 C57 5P L6 C6 8P R9 R59 7 C60 C59 00P C58 T9 DTCEE R85 0K BATT R60 7 L60 0NH D60 HVC D6 HVC D6 HSC77 R9 K T9 SB6 R97 0K C905 R88 0K R87 0 R86 0 R96 00K R9 00K C9 C6 P L6 T(0) C6 P E9 0uF/6V C90 C8 R9 K C9 C6 D6 HSC77 U9 CE60AP Gnd R8 C90 0uF/0V C6 P C6 P C66 P L6 L66 T(00) 5T(00) T8 SK8 C9 C9 C90 C65 6P E9 0uF/0V R8 7 R8 K C68 P5 L68 5T(00) C67 P J8 BATT C907 R8 K8 C8.7uF/6V L90 0T C90 05P C69 P C8 C906 L69 0K BA90 BATTERY ANT60 ANT- C8 0P R5 SW5A RD80S SP5 SP- JK5 ST JK8 ST-

13 - I I Block Diagram + - LDF ANT PGA ADC ANT SW LNA + 0/90 Q PGA Q ADC PA RFOUT PA_drvier VCO DVDD.V LDO AVDD LDO Synthesize Benchmark frequencyinput AF AMP DSP Core Audio filter SubCH filter FM modem AFC loop RSSI DAC ADC GPIO Interface Bus LIMITER AMP HPF INT/GPIO SQ/GPIO VOX/GPIO PTT PTT PDN MCU SEN LAMP SCLK SDIO CTSIN CTSOUT MONI EODER

14 BOM MODEL speficition qty position number capacitance 0P5 C00 C7 5P C00 C6 C75 C7 0P C00 5 C C6 C C9 C8 P C00 C89 C88 5P C00 C6 C 7P C00 C6 C P C00 C 00P C00 C75 C00 9 C878 C876 C5 C5 C5 C8 C77 C8 C8 C7 C7 C76 C5 C C7 C8 C7 C0 R7 C00 5 C55 C9 C56 C9 C85 C8 C7 C C7 C C C8 C0 C90 C7 C00 9 C5 C9 C59 C58 C57 C55 C5 C5 C9 C5 C5 C78 C C8 C5 C66 C58 C6 C8 C8 C C5 C87 C8 C8 C0 C905 C70 C8 05P C00 C5 C7 C8 0P C00 C8 P C00 C C00 8 C907 C906 C858 C856 C85 C85 C85 C8 C8 C56 C76 C65 C60 C7 C6 C5 C C C C C80 C7 C0 C9 C95 C87 C9 C90 7P C00 C55 C5 7P C00 C5 P C060 C6 6P C060 C69 0P C060 C6 P C060 C68 C66 P C060 C67 0P C060 C65 P C060 C6 56P C060 C5 68P C060 C59 05P C060 C C90 C060 C6 0uF/0V(06P) C0805 C90 E9 E9 C0 uf(05p) C0805 C E5.7uF(75P) C0805 E80 C8 uf EIA6 E56 0uF E-06L E5 resistance R00 7 R R C C98 C6 C5 R6 K R00 6 R5 R8 R5 R5 R9 R5 K5 R00 R6 R875 K8 R00 R8 K R00 R0 R9 C55

15 K9 R00 R9 K7 R00 8 R95 R85 R8 R8 R55 R5 R87 R6 8K R00 R 0K R00 0 R9 R8 R88 R87 R77 R87 R8 R85 R97 R8 R00 5 R59 R58 R57 R5 R K R00 R58 K R00 R K R00 R55 R86 R00 7 R8 R5 R8 R857 R855 R85 R85 R9 R7 R R R7 R88 R86 R8 R8 R0 7R R00 R R6 5K R00 R87 56K R00 R55 8K R00 R5 00K R00 8 R9 R96 R69 R68 R67 R8 R87 R7 0 R00 7 R87 R858 R856 R85 R85 R5 R86 50K R00 6 R75 R7 R7 R7 R7 R70 80K R00 R85 0K R00 R8 R00 R5 R877 7 R00 R60 R59 0K R00 R5 R00 R7 R7 R8 70K R00 R5 7 R00 R8 5 R00 R5 68 R00 R8 M R00 R55 R66 R8 R060 R L96 L9 L5 R0805 R57 0K R06 L R06 R06 R05 R0 50K RV08 RV induction 7NH L060 L6 L5 00NH L060 L8 L6 L75 0nH L060 L7 L60 90NH L060 L7 0T L060 L76 L8 L 0T L0805 L L L90 0.*.5*5T 5T L L6 0.*.5*6T 6T L6 L68 L66 0.*.5*8T 8T L6 0.*.*T T L55 diode LED(G) D060 D877 LED(R) D060 D875 HSC77 D-ESC D6 D6 HVC D-ESC D6 D60 KDS D-USM-MA7 D5 audion RQA0009 T-NA-SK76 T

16 SK8 T-ESM-SK8 T8 T8 DTAYE T-ESM-DTAEE T76 T8 DTCEE T-ESM-DTAEE 7 T877 T875 T5 T77 T0 T9 T7 078 T-SOT89-SK078 T SA6 T-TSM-SB6 T5 SB6 T-TSM-SB6 T9 T0 SC56 T-TSM-SC56(R5) T RQ7A T-US U8 SK8 T-US-SK8 T7 MRF97 T-USM-MRF97 T5 KTC08(HF) T-USM-MRF97 T integration RDA86 U-QFN(RDA86) U AUDIO-6 U-SOIC6 U5 SMP8VD-0800 U-SOP8 U8 C08 U-SOP8 U8 UTC8 U-SOP8 U5 HT7 U-SOT89-5A U9 LM90V U-SSOP8 U70 other 6MHz FX-DS005 CR5.768KHz FX-DS060 CR88 BATTERY JK-C BC-7S--D BA90 SP- JP-SM.7- SP5 PTT S-SKRT- SW85 CALL S-SS08GS6 SW8 MONI S-SS08GS6 SW8 BATT J-TEST POINT J8 pinouts ANT- PX--ANT ANT SW-6 S-ED08CO SW85 RD80S S-R087FENS SW5 ST- JK-ST-06 JK8 ST-0-06 JK-ST-0-06 JK5 ALARM S-SKHLLBA00 SW87 PCB CW5080-0

17 Chip Pin Description Pin No. Pin Name Function description OSCI Clock crystal input pin OCSO Clock crystal output pin RESER Reset pin ALARM Alarm key detection pin 5 RXD read and write frequency data 6 RDA_SDIL/CALL RDA SDIL and CALL key control pin 7 RDA_CEDE IN/OUT 86 data input/output pin 8 RDA_CSS IN/OUT 86 CTCSS input/output pin 9 MONI/BEEP squelch key/beep control pin 0 CH encoder control pin CH encoder control pin CH encoder control pin CH encoder control pin TX_LED transmit indicator light 5 RDA_INT 86 data control pin 6 RX_LED receive indicator light 7 TXD read and write frequency data 8 PTT PTT key control pin 9 VSS ground pin 0 VDD power VCC APC auto power control RDA_SCLK/PTT 86 data control pin BATDET power detection pin 5 RDA_SEN 86 data control pin 6 RDA_PDN 86 data control pin 7 VOX-DET VOX detection pin 8 RDA_SQ squelch control pin

18 SPECIFICATION Frequency Range 00-70MHz Channel Number 6 Channel Step Antenna Impedance Microphone Impedance work voltage Frequency Stability.5KHz 50Ω KΩ 7.V DC ± ppm Transmitter carrier output power modulation sensitivity 5W 8-mV Modulation Distortion 5% Modulation Limited Adjacent Channel Power Intermodulatohn Rejection 5KHz 65dB 0dB RECEIVER Sensitivity 0.uV Audio Distortion 5% SN RATE -0 Co-Channel Rejection Blocking Adjacent Channel Selectivity Spurious Radiation -8dB 85dB 55dB 55dB