OB ANT-80 NELSON INFORMATION & COMMUNICATION CO. LTD.
OB ANT-80 NELSON INFORMATION & COMMUNICATION CO. LTD.
OB ANT-80 NELSON INFORMATION & COMMUNICATION CO., LTD. TEL : 82-2-887-2690 (EXT 766} FAX : 822-887-2693 USER'S MANUAL 1. PRODUCT INTRODUCTION The NT-8 LMR (LAND MOBILE RADIO) FROM NELSON 1&C CO. LTD. UTILIZES THE LATEST TECHNOLOGY IN ITS DESIGN AND MANUFACTURING, NT-8¢ IS PLL {PHASE LOCK LOOP SYNTHESIZER)YMICROPROCESSOR CONTROLLED, AND OFFER 35 WATTS OF POWER WITH 16 CHANNEL CAPABILITY.
OB ANT-80 NELSON INFORMATION & COMMUNICATION CO, LTD. TEL : 82-2-887-2690 (EXT 706) FAX : B-2-887-2693 2. HOW TO USE POWER ON/OFF, VOLUME CONTROL ~ TURN THE RADIO ON AND ADJUST THE VOLUME LEVEL. ROTARY CHANNEL SELECTOR SWITCH — SELECT THE OPERATING CHANNEL OR INITIATES SCAN OPERATION.
OB ANT-80 NELSON INFORMATION & COMMUNICATION CO, LTD. TEL : 82-2-887-2690 (EXT 766) FAX: 82-2-887-2603 3. THEORY OF OPERATION FREQUENCY GENERATION CIRCUITRY THE FREQUENCY GENERATION CIRCUITRY 1S COMPOSED OF THE SYNTHESIZER IC(UT02) AND THE VCO. THE BLOCK DIAGRAM ILLUSTRATES THE INTERCONNECT AND SUPPORT CIRCUITRY USED IN THE DESIGN. REFER TO THE SCHEMATIC FOR REFERENCE DESIGNATION.
OB ANT-80 NELSON INFORMATION & COMMUNICATION CO. LTD. TEL : 82-2-887-2690 (EXT 766) FAX: 82-2-887-2693 IN THE RECEIVE MODE, THE VCO IS OSCILLATED BY THE COCKPITS OSCILLATOR, WHICH CONSISTS OF D535, DS6, C177, VC1, L72, C178, 1.72, C179, C180 AND O61. THE Q63 AND PERIPHERAL COMPONENTS AMPLIFY AN RF CARRIER OSCILLATED FROM TX AND RX VCO, MAINTAIN -DBMS OUTPUT LEVEL AND REJECT THE EFFECTS OF REVERSE POWER CONNECTED TO OUTPUT TERMINAL.
OB ANT-80 NELSON INFORMATION & COMMUNICATION CO., LTD. TEL : 82-2-887-2690 (EXT 766} PAX : R-2-887-2693 FRONT END FRONT END SELECTS AND AMPLIFIES THE SIGNALS OF WANTED BAND AMONG RF SIGNALS EXISTING IN THE FREE SPACE. IT CONSISTS OF THE BAND PASS FILTER (BPF) AND LOW NOISE AMPLIFIER (ULNA. i THE FILTER 18 COMPOSED OF $™ BPF BEFORE THE LNA AND 7™ BPF AFTER THE LNA, IT SELECTS THE BANDS BETWEEN 146MHz AND 174MHz.
OB ANT-80 NELSON INFORMATION & COMMUNICATION CO. LTD. TEL : 82-2-887-2690 (EXT 766) FAX: MICROPROCESSOR UNIT (MPU) THE MPU (U200) IS TH HIGH SPEED AND HIGH PERFORMANCE 8-BIT SINGLE CHIP MICROCOMPUTER, THE MPU CONTAIN CPU CORE, ROM, RAM, OUTPUTTING PORTS, A/D CONVERTER, TIMER/COUNTER. MPU PORT ASSIGNMENT PORT PORT FUNCTION PORT PORT FUNCTION NAME NAME PO POO PLL DATA P6 P.O CH. SWITCH | P01 PLL ENABLE P61 CH. SWITCH 2 ps2 CH. SWITCH 4 P2 P22 PC PROGRAM P63 CH. SWITCH 8 P2.3 BEEP GEN. P66 LOW BAT. DET. P2.
OB ANT-80 NELSON INFORMATION & COMMUNICATION CO., LTD. TEL : 82-2-887-2690 (EXT 766) FAX: R-2-887-2693 AK2342B BLOCK DIAGRAM ass sin Of Tt ANE fy new. in Son | | Poe Diem frees aver Tac oan § aon THOR GORE DEXTER WA [NEs ER AUDIO AMP. THE AUDIO AMP AMPLIFIES AN AUDIO SIGNAL FOR A USER TO LISTEN TO THE VOICE, ALSO AMPLIFIES AN ERROR TONE OF EACH FUNCTION. 1T 1S COMPOSED OF THE VOLUME SWITCH, MUTE SWITCH (Q206), AND AUDIO AMP. (1J205).
OB ANT-80 NELSON INFORMATION & COMMUNICATION CO, LTD, 4. GENERAL SPECIFICATIONS TEL ; 82-2-887-2690 (EXT 766) FAX : §2-2-887-2693 GENERAL POWER SUPPLY Rechargeable Nickel-Cadmium Battery, 7.5VDC POWER SUPPLY VOLTAGE RANGE 6.75 8.